Add SQL output plugin (#9280)

2021-06-03 22:49:55 -06:00 · 2021-06-03 22:49:55 -06:00 · e289612ff3
parent ee44aee1ca
commit e289612ff3
14 changed files with 1373 additions and 60 deletions
--- a/README.md
+++ b/README.md
@ -326,6 +326,7 @@ For documentation on the latest development code see the [documentation index][d
 * [solr](./plugins/inputs/solr)
 * [sql server](./plugins/inputs/sqlserver) (microsoft)
 * [stackdriver](./plugins/inputs/stackdriver) (Google Cloud Monitoring)
+* [sql](./plugins/outputs/sql) (SQL generic output)
 * [statsd](./plugins/inputs/statsd)
 * [suricata](./plugins/inputs/suricata)
 * [swap](./plugins/inputs/swap)
--- a/docs/LICENSE_OF_DEPENDENCIES.md
+++ b/docs/LICENSE_OF_DEPENDENCIES.md
@ -10,6 +10,7 @@ following works:
 - github.com/Azure/azure-event-hubs-go [MIT License](https://github.com/Azure/azure-event-hubs-go/blob/master/LICENSE)
 - github.com/Azure/azure-pipeline-go [MIT License](https://github.com/Azure/azure-pipeline-go/blob/master/LICENSE)
 - github.com/Azure/azure-sdk-for-go [Apache License 2.0](https://github.com/Azure/azure-sdk-for-go/blob/master/LICENSE)
+- github.com/Azure/azure-storage-blob-go [MIT License](https://github.com/Azure/azure-storage-blob-go/blob/master/LICENSE)
 - github.com/Azure/azure-storage-queue-go [MIT License](https://github.com/Azure/azure-storage-queue-go/blob/master/LICENSE)
 - github.com/Azure/go-amqp [MIT License](https://github.com/Azure/go-amqp/blob/master/LICENSE)
 - github.com/Azure/go-autorest [Apache License 2.0](https://github.com/Azure/go-autorest/blob/master/LICENSE)
@ -23,6 +24,7 @@ following works:
 - github.com/amir/raidman [The Unlicense](https://github.com/amir/raidman/blob/master/UNLICENSE)
 - github.com/antchfx/xmlquery [MIT License](https://github.com/antchfx/xmlquery/blob/master/LICENSE)
 - github.com/antchfx/xpath [MIT License](https://github.com/antchfx/xpath/blob/master/LICENSE)
+- github.com/apache/arrow/go/arrow [Apache License 2.0](https://github.com/apache/arrow/blob/master/LICENSE.txt)
 - github.com/apache/thrift [Apache License 2.0](https://github.com/apache/thrift/blob/master/LICENSE)
 - github.com/aristanetworks/glog [Apache License 2.0](https://github.com/aristanetworks/glog/blob/master/LICENSE)
 - github.com/aristanetworks/goarista [Apache License 2.0](https://github.com/aristanetworks/goarista/blob/master/COPYING)
@ -32,8 +34,12 @@ following works:
 - github.com/aws/aws-sdk-go-v2/config [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/config/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/credentials [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/credentials/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/feature/ec2/imds [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/feature/ec2/imds/LICENSE.txt)
+- github.com/aws/aws-sdk-go-v2/feature/s3/manager [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/service/ec2 [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/ec2/LICENSE.txt)
+- github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/internal/accept-encoding/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/service/internal/presigned-url [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/internal/presigned-url/LICENSE.txt)
+- github.com/aws/aws-sdk-go-v2/service/internal/s3shared [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/internal/s3shared/LICENSE.txt)
+- github.com/aws/aws-sdk-go-v2/service/s3 [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/s3/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/service/sso [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/ec2/LICENSE.txt)
 - github.com/aws/aws-sdk-go-v2/service/sts [Apache License 2.0](https://github.com/aws/aws-sdk-go-v2/blob/main/service/sts/LICENSE.txt)
 - github.com/aws/smithy-go [Apache License 2.0](https://github.com/aws/smithy-go/blob/main/LICENSE)
@ -80,10 +86,12 @@ following works:
 - github.com/golang/groupcache [Apache License 2.0](https://github.com/golang/groupcache/blob/master/LICENSE)
 - github.com/golang/protobuf [BSD 3-Clause "New" or "Revised" License](https://github.com/golang/protobuf/blob/master/LICENSE)
 - github.com/golang/snappy [BSD 3-Clause "New" or "Revised" License](https://github.com/golang/snappy/blob/master/LICENSE)
+- github.com/google/flatbuffers [Apache License 2.0](https://github.com/google/flatbuffers/blob/master/LICENSE.txt)
 - github.com/google/go-cmp [BSD 3-Clause "New" or "Revised" License](https://github.com/google/go-cmp/blob/master/LICENSE)
 - github.com/google/go-github [BSD 3-Clause "New" or "Revised" License](https://github.com/google/go-github/blob/master/LICENSE)
 - github.com/google/go-querystring [BSD 3-Clause "New" or "Revised" License](https://github.com/google/go-querystring/blob/master/LICENSE)
 - github.com/google/gofuzz [Apache License 2.0](https://github.com/google/gofuzz/blob/master/LICENSE)
+- github.com/google/uuid [BSD 3-Clause "New" or "Revised" License](https://github.com/google/uuid/blob/master/LICENSE)
 - github.com/googleapis/gax-go [BSD 3-Clause "New" or "Revised" License](https://github.com/googleapis/gax-go/blob/master/LICENSE)
 - github.com/googleapis/gnostic [Apache License 2.0](https://github.com/google/gnostic/blob/master/LICENSE)
 - github.com/gopcua/opcua [MIT License](https://github.com/gopcua/opcua/blob/master/LICENSE)
@ -128,10 +136,10 @@ following works:
 - github.com/karrick/godirwalk [BSD 2-Clause "Simplified" License](https://github.com/karrick/godirwalk/blob/master/LICENSE)
 - github.com/kballard/go-shellquote [MIT License](https://github.com/kballard/go-shellquote/blob/master/LICENSE)
 - github.com/klauspost/compress [BSD 3-Clause Clear License](https://github.com/klauspost/compress/blob/master/LICENSE)
- github.com/konsorten/go-windows-terminal-sequences [MIT License](https://github.com/konsorten/go-windows-terminal-sequences/blob/master/LICENSE)
 - github.com/leodido/ragel-machinery [MIT License](https://github.com/leodido/ragel-machinery/blob/develop/LICENSE)
 - github.com/mailru/easyjson [MIT License](https://github.com/mailru/easyjson/blob/master/LICENSE)
 - github.com/mattn/go-colorable [MIT License](https://github.com/mattn/go-colorable/blob/master/LICENSE)
+- github.com/mattn/go-ieproxy [MIT License](https://github.com/mattn/go-ieproxy/blob/master/LICENSE)
 - github.com/mattn/go-isatty [MIT License](https://github.com/mattn/go-isatty/blob/master/LICENSE)
 - github.com/matttproud/golang_protobuf_extensions [Apache License 2.0](https://github.com/matttproud/golang_protobuf_extensions/blob/master/LICENSE)
 - github.com/mdlayher/apcupsd [MIT License](https://github.com/mdlayher/apcupsd/blob/master/LICENSE.md)
@ -160,6 +168,7 @@ following works:
 - github.com/openzipkin/zipkin-go-opentracing [MIT License](https://github.com/openzipkin/zipkin-go-opentracing/blob/master/LICENSE)
 - github.com/philhofer/fwd [MIT License](https://github.com/philhofer/fwd/blob/master/LICENSE.md)
 - github.com/pierrec/lz4 [BSD 3-Clause "New" or "Revised" License](https://github.com/pierrec/lz4/blob/master/LICENSE)
+- github.com/pkg/browser [BSD 2-Clause "Simplified" License](https://github.com/pkg/browser/blob/master/LICENSE)
 - github.com/pkg/errors [BSD 2-Clause "Simplified" License](https://github.com/pkg/errors/blob/master/LICENSE)
 - github.com/pmezard/go-difflib [BSD 3-Clause Clear License](https://github.com/pmezard/go-difflib/blob/master/LICENSE)
 - github.com/prometheus/client_golang [Apache License 2.0](https://github.com/prometheus/client_golang/blob/master/LICENSE)
@ -168,6 +177,7 @@ following works:
 - github.com/prometheus/procfs [Apache License 2.0](https://github.com/prometheus/procfs/blob/master/LICENSE)
 - github.com/prometheus/prometheus [Apache License 2.0](https://github.com/prometheus/prometheus/blob/master/LICENSE)
 - github.com/rcrowley/go-metrics [MIT License](https://github.com/rcrowley/go-metrics/blob/master/LICENSE)
+- github.com/remyoudompheng/bigfft [BSD 3-Clause "New" or "Revised" License](https://github.com/remyoudompheng/bigfft/blob/master/LICENSE)
 - github.com/riemann/riemann-go-client [MIT License](https://github.com/riemann/riemann-go-client/blob/master/LICENSE)
 - github.com/safchain/ethtool [Apache License 2.0](https://github.com/safchain/ethtool/blob/master/LICENSE)
 - github.com/samuel/go-zookeeper [BSD 3-Clause Clear License](https://github.com/samuel/go-zookeeper/blob/master/LICENSE)
@ -177,6 +187,7 @@ following works:
 - github.com/signalfx/golib [Apache License 2.0](https://github.com/signalfx/golib/blob/master/LICENSE)
 - github.com/signalfx/sapm-proto [Apache License 2.0](https://github.com/signalfx/sapm-proto/blob/master/LICENSE)
 - github.com/sirupsen/logrus [MIT License](https://github.com/sirupsen/logrus/blob/master/LICENSE)
+- github.com/snowflakedb/gosnowflake [Apache License 2.0](https://github.com/snowflakedb/gosnowflake/blob/master/LICENSE)
 - github.com/streadway/amqp [BSD 2-Clause "Simplified" License](https://github.com/streadway/amqp/blob/master/LICENSE)
 - github.com/stretchr/objx [MIT License](https://github.com/stretchr/objx/blob/master/LICENSE)
 - github.com/stretchr/testify [custom -- permissive](https://github.com/stretchr/testify/blob/master/LICENSE)
@ -240,6 +251,7 @@ following works:
 - k8s.io/klog [Apache License 2.0](https://github.com/kubernetes/client-go/blob/master/LICENSE)
 - k8s.io/utils [Apache License 2.0](https://github.com/kubernetes/client-go/blob/master/LICENSE)
 - modernc.org/libc [BSD 3-Clause "New" or "Revised" License](https://gitlab.com/cznic/libc/-/blob/master/LICENSE)
+- modernc.org/mathutil [BSD 3-Clause "New" or "Revised" License](https://gitlab.com/cznic/mathutil/-/blob/master/LICENSE)
 - modernc.org/memory [BSD 3-Clause "New" or "Revised" License](https://gitlab.com/cznic/memory/-/blob/master/LICENSE)
 - modernc.org/sqlite [BSD 3-Clause "New" or "Revised" License](https://gitlab.com/cznic/sqlite/-/blob/master/LICENSE)
 - sigs.k8s.io/structured-merge-diff [Apache License 2.0](https://github.com/kubernetes/client-go/blob/master/LICENSE)
--- a/go.mod
+++ b/go.mod
@ -27,25 +27,24 @@ require (
 	github.com/aristanetworks/glog v0.0.0-20191112221043-67e8567f59f3 // indirect
 	github.com/aristanetworks/goarista v0.0.0-20190325233358-a123909ec740
 	github.com/aws/aws-sdk-go v1.34.34
-	github.com/aws/aws-sdk-go-v2 v1.1.0
-	github.com/aws/aws-sdk-go-v2/config v1.1.0
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.0.1
+	github.com/aws/aws-sdk-go-v2 v1.3.2
+	github.com/aws/aws-sdk-go-v2/config v1.1.5
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.0.6
 	github.com/aws/aws-sdk-go-v2/service/ec2 v1.1.0
-	github.com/aws/smithy-go v1.0.0
+	github.com/aws/smithy-go v1.3.1
 	github.com/benbjohnson/clock v1.0.3
 	github.com/bitly/go-hostpool v0.1.0 // indirect
 	github.com/bmatcuk/doublestar/v3 v3.0.0
 	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869
 	github.com/caio/go-tdigest v3.1.0+incompatible
 	github.com/cisco-ie/nx-telemetry-proto v0.0.0-20190531143454-82441e232cf6
-	github.com/containerd/containerd v1.4.1 // indirect
 	github.com/couchbase/go-couchbase v0.0.0-20180501122049-16db1f1fe037
 	github.com/couchbase/gomemcached v0.0.0-20180502221210-0da75df14530 // indirect
 	github.com/couchbase/goutils v0.0.0-20180530154633-e865a1461c8a // indirect
 	github.com/denisenkom/go-mssqldb v0.9.0
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
 	github.com/dimchansky/utfbom v1.1.1
-	github.com/docker/docker v17.12.0-ce-rc1.0.20200916142827-bd33bbf0497b+incompatible
+	github.com/docker/docker v20.10.5+incompatible
 	github.com/eclipse/paho.mqtt.golang v1.3.0
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
 	github.com/go-logfmt/logfmt v0.5.0
@ -85,7 +84,7 @@ require (
 	github.com/karrick/godirwalk v1.16.1
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/lib/pq v1.3.0 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1
+	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369
 	github.com/mdlayher/apcupsd v0.0.0-20200608131503-2bf01da7bf1b
 	github.com/microsoft/ApplicationInsights-Go v0.4.4
 	github.com/miekg/dns v1.1.31
@ -102,7 +101,7 @@ require (
 	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/common v0.15.0
-	github.com/prometheus/procfs v0.1.3
+	github.com/prometheus/procfs v0.2.0
 	github.com/prometheus/prometheus v1.8.2-0.20200911110723-e83ef207b6c2
 	github.com/riemann/riemann-go-client v0.5.0
 	github.com/safchain/ethtool v0.0.0-20200218184317-f459e2d13664
@ -110,10 +109,12 @@ require (
 	github.com/shirou/gopsutil v3.21.3+incompatible
 	github.com/shopspring/decimal v0.0.0-20200105231215-408a2507e114 // indirect
 	github.com/signalfx/golib/v3 v3.3.0
-	github.com/sirupsen/logrus v1.6.0
+	github.com/sirupsen/logrus v1.7.0
+	github.com/snowflakedb/gosnowflake v1.5.0
 	github.com/streadway/amqp v0.0.0-20190827072141-edfb9018d271
 	github.com/stretchr/testify v1.7.0
 	github.com/tbrandon/mbserver v0.0.0-20170611213546-993e1772cc62
+	github.com/testcontainers/testcontainers-go v0.10.0
 	github.com/tidwall/gjson v1.6.0
 	github.com/tinylib/msgp v1.1.5
 	github.com/tklauser/go-sysconf v0.3.5 // indirect
@ -127,7 +128,7 @@ require (
 	github.com/yuin/gopher-lua v0.0.0-20180630135845-46796da1b0b4 // indirect
 	go.starlark.net v0.0.0-20210406145628-7a1108eaa012
 	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/net v0.0.0-20201209123823-ac852fbbde11
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
 	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	golang.org/x/sys v0.0.0-20210316164454-77fc1eacc6aa
@ -135,7 +136,7 @@ require (
 	golang.org/x/tools v0.1.0
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20200205215550-e35592f146e4
 	google.golang.org/api v0.29.0
-	google.golang.org/genproto v0.0.0-20200815001618-f69a88009b70
+	google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a
 	google.golang.org/grpc v1.37.0
 	gopkg.in/djherbis/times.v1 v1.2.0
 	gopkg.in/fatih/pool.v2 v2.0.0 // indirect
@ -143,12 +144,12 @@ require (
 	gopkg.in/ldap.v3 v3.1.0
 	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
 	gopkg.in/olivere/elastic.v5 v5.0.70
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 	gotest.tools v2.2.0+incompatible
 	k8s.io/api v0.20.4
 	k8s.io/apimachinery v0.20.4
 	k8s.io/client-go v0.20.4
-	modernc.org/sqlite v1.7.4
+	modernc.org/sqlite v1.10.8
 )

 // replaced due to https://github.com/satori/go.uuid/issues/73
--- a/go.sum
+++ b/go.sum
--- a/plugins/outputs/all/all.go
+++ b/plugins/outputs/all/all.go
@ -40,6 +40,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/outputs/sensu"
 	_ "github.com/influxdata/telegraf/plugins/outputs/signalfx"
 	_ "github.com/influxdata/telegraf/plugins/outputs/socket_writer"
+	_ "github.com/influxdata/telegraf/plugins/outputs/sql"
 	_ "github.com/influxdata/telegraf/plugins/outputs/stackdriver"
 	_ "github.com/influxdata/telegraf/plugins/outputs/sumologic"
 	_ "github.com/influxdata/telegraf/plugins/outputs/syslog"
--- a/plugins/outputs/sql/README.md
+++ b/plugins/outputs/sql/README.md
@ -0,0 +1,150 @@
+# SQL Output Plugin
+
+The SQL output plugin saves Telegraf metric data to an SQL database.
+
+The plugin uses a simple, hard-coded database schema. There is a table
+for each metric type and the table name is the metric name. There is a
+column per field and a column per tag. There is an optional column for
+the metric timestamp.
+
+A row is written for every input metric. This means multiple metrics
+are never merged into a single row, even if they have the same metric
+name, tags, and timestamp.
+
+The plugin uses Golang's generic "database/sql" interface and third
+party drivers. See the driver-specific section below for a list of
+supported drivers and details. Additional drivers may be added in
+future Telegraf releases.
+
+## Getting started
+
+To use the plugin, set the driver setting to the driver name
+appropriate for your database. Then set the data source name
+(DSN). The format of the DSN varies by driver but often includes a
+username, password, the database instance to use, and the hostname of
+the database server. The user account must have privileges to insert
+rows and create tables.
+
+## Generated SQL
+
+The plugin generates simple ANSI/ISO SQL that is likely to work on any
+DBMS. It doesn't use language features that are specific to a
+particular DBMS. If you want to use a feature that is specific to a
+particular DBMS, you may be able to set it up manually outside of this
+plugin or through the init_sql setting.
+
+The insert statements generated by the plugin use placeholder
+parameters. Most database drivers use question marks as placeholders
+but postgres uses indexed dollar signs. The plugin chooses which
+placeholder style to use depending on the driver selected.
+
+## Advanced options
+
+When the plugin first connects it runs SQL from the init_sql setting,
+allowing you to perform custom initialization for the connection.
+
+Before inserting a row, the plugin checks whether the table exists. If
+it doesn't exist, the plugin creates the table. The existence check
+and the table creation statements can be changed through template
+settings. The template settings allows you to have the plugin create
+customized tables or skip table creation entirely by setting the check
+template to any query that executes without error, such as "select 1".
+
+The name of the timestamp column is "timestamp" but it can be changed
+with the timestamp\_column setting. The timestamp column can be
+completely disabled by setting it to "".
+
+By changing the table creation template, it's possible with some
+databases to save a row insertion timestamp. You can add an additional
+column with a default value to the template, like "CREATE TABLE
+{TABLE}(insertion_timestamp TIMESTAMP DEFAULT CURRENT\_TIMESTAMP,
+{COLUMNS})".
+
+The mapping of metric types to sql column types can be customized
+through the convert settings.
+
+## Configuration
+
+```
+# Save metrics to an SQL Database
+[[outputs.sql]]
+  ## Database driver
+  ## Valid options: mssql (Microsoft SQL Server), mysql (MySQL), pgx (Postgres),
+  ##  sqlite (SQLite3), snowflake (snowflake.com)
+  # driver = ""
+
+  ## Data source name
+  ## The format of the data source name is different for each database driver.
+  ## See the plugin readme for details.
+  # data_source_name = ""
+
+  ## Timestamp column name
+  # timestamp_column = "timestamp"
+
+  ## Table creation template
+  ## Available template variables:
+  ##  {TABLE} - table name as a quoted identifier
+  ##  {TABLELITERAL} - table name as a quoted string literal
+  ##  {COLUMNS} - column definitions (list of quoted identifiers and types)
+  # table_template = "CREATE TABLE {TABLE}({COLUMNS})"
+
+  ## Table existence check template
+  ## Available template variables:
+  ##  {TABLE} - tablename as a quoted identifier
+  # table_exists_template = "SELECT 1 FROM {TABLE} LIMIT 1"
+
+  ## Initialization SQL
+  # init_sql = ""
+
+  ## Metric type to SQL type conversion
+  #[outputs.sql.convert]
+  #  integer              = "INT"
+  #  real                 = "DOUBLE"
+  #  text                 = "TEXT"
+  #  timestamp            = "TIMESTAMP"
+  #  defaultvalue         = "TEXT"
+  #  unsigned             = "UNSIGNED"
+```
+
+## Driver-specific information
+
+### go-sql-driver/mysql
+
+MySQL default quoting differs from standard ANSI/ISO SQL quoting. You
+must use MySQL's ANSI\_QUOTES mode with this plugin. You can enable
+this mode by using the setting `init_sql = "SET
+sql_mode='ANSI_QUOTES';"` or through a command-line option when
+running MySQL. See MySQL's docs for [details on
+ANSI\_QUOTES](https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html#sqlmode_ansi_quotes)
+and [how to set the SQL
+mode](https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html#sql-mode-setting).
+
+You can use a DSN of the format
+"username:password@tcp(host:port)/dbname". See the [driver
+docs](https://github.com/go-sql-driver/mysql) for details.
+
+### jackc/pgx
+
+You can use a DSN of the format
+"postgres://username:password@host:port/dbname". See the [driver
+docs](https://github.com/jackc/pgx) for more details.
+
+### modernc.org/sqlite
+
+This driver is not available on all operating systems and
+architectures. It is only included in Linux builds on amd64, 386,
+arm64, arm, and Darwin on amd64. It is not available for Windows,
+FreeBSD, and other Linux and Darwin platforms.
+
+The DSN is a filename or url with scheme "file:". See the [driver
+docs](https://modernc.org/sqlite) for details.
+
+### denisenkom/go-mssqldb
+
+Telegraf doesn't have unit tests for go-mssqldb so it should be
+treated as experimental.
+
+### snowflakedb/gosnowflake
+
+Telegraf doesn't have unit tests for gosnowflake so it should be
+treated as experimental.
--- a/plugins/outputs/sql/sql.go
+++ b/plugins/outputs/sql/sql.go
@ -0,0 +1,277 @@
+package sql
+
+import (
+	gosql "database/sql"
+	"fmt"
+	"strings"
+
+	//Register sql drivers
+	_ "github.com/denisenkom/go-mssqldb"   // mssql (sql server)
+	_ "github.com/go-sql-driver/mysql"     // mysql
+	_ "github.com/jackc/pgx/v4/stdlib"     // pgx (postgres)
+	_ "github.com/snowflakedb/gosnowflake" // snowflake
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/outputs"
+)
+
+type ConvertStruct struct {
+	Integer      string
+	Real         string
+	Text         string
+	Timestamp    string
+	Defaultvalue string
+	Unsigned     string
+}
+
+type SQL struct {
+	Driver              string
+	DataSourceName      string
+	TimestampColumn     string
+	TableTemplate       string
+	TableExistsTemplate string
+	InitSQL             string `toml:"init_sql"`
+	Convert             ConvertStruct
+
+	db     *gosql.DB
+	Log    telegraf.Logger `toml:"-"`
+	tables map[string]bool
+}
+
+func (p *SQL) Connect() error {
+	db, err := gosql.Open(p.Driver, p.DataSourceName)
+	if err != nil {
+		return err
+	}
+
+	err = db.Ping()
+	if err != nil {
+		return err
+	}
+
+	if p.InitSQL != "" {
+		_, err = db.Exec(p.InitSQL)
+		if err != nil {
+			return err
+		}
+	}
+
+	p.db = db
+	p.tables = make(map[string]bool)
+
+	return nil
+}
+
+func (p *SQL) Close() error {
+	return p.db.Close()
+}
+
+// Quote an identifier (table or column name)
+func quoteIdent(name string) string {
+	return `"` + strings.Replace(sanitizeQuoted(name), `"`, `""`, -1) + `"`
+}
+
+// Quote a string literal
+func quoteStr(name string) string {
+	return "'" + strings.Replace(name, "'", "''", -1) + "'"
+}
+
+func sanitizeQuoted(in string) string {
+	// https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
+	// https://www.postgresql.org/docs/13/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
+
+	// Whitelist allowed characters
+	return strings.Map(func(r rune) rune {
+		switch {
+		case r >= '\u0001' && r <= '\uFFFF':
+			return r
+		default:
+			return '_'
+		}
+	}, in)
+}
+
+func (p *SQL) deriveDatatype(value interface{}) string {
+	var datatype string
+
+	switch value.(type) {
+	case int64:
+		datatype = p.Convert.Integer
+	case uint64:
+		datatype = fmt.Sprintf("%s %s", p.Convert.Integer, p.Convert.Unsigned)
+	case float64:
+		datatype = p.Convert.Real
+	case string:
+		datatype = p.Convert.Text
+	default:
+		datatype = p.Convert.Defaultvalue
+		p.Log.Errorf("Unknown datatype: '%T' %v", value, value)
+	}
+	return datatype
+}
+
+var sampleConfig = `
+  ## Database driver
+  ## Valid options: mssql (Microsoft SQL Server), mysql (MySQL), pgx (Postgres),
+  ##  sqlite (SQLite3), snowflake (snowflake.com)
+  # driver = ""
+
+  ## Data source name
+  ## The format of the data source name is different for each database driver.
+  ## See the plugin readme for details.
+  # data_source_name = ""
+
+  ## Timestamp column name
+  # timestamp_column = "timestamp"
+
+  ## Table creation template
+  ## Available template variables:
+  ##  {TABLE} - table name as a quoted identifier
+  ##  {TABLELITERAL} - table name as a quoted string literal
+  ##  {COLUMNS} - column definitions (list of quoted identifiers and types)
+  # table_template = "CREATE TABLE {TABLE}({COLUMNS})"
+
+  ## Table existence check template
+  ## Available template variables:
+  ##  {TABLE} - tablename as a quoted identifier
+  # table_exists_template = "SELECT 1 FROM {TABLE} LIMIT 1"
+
+  ## Initialization SQL
+  # init_sql = ""
+
+  ## Metric type to SQL type conversion
+  #[outputs.sql.convert]
+  #  integer              = "INT"
+  #  real                 = "DOUBLE"
+  #  text                 = "TEXT"
+  #  timestamp            = "TIMESTAMP"
+  #  defaultvalue         = "TEXT"
+  #  unsigned             = "UNSIGNED"
+`
+
+func (p *SQL) SampleConfig() string { return sampleConfig }
+func (p *SQL) Description() string  { return "Send metrics to SQL Database" }
+
+func (p *SQL) generateCreateTable(metric telegraf.Metric) string {
+	var columns []string
+	//  ##  {KEY_COLUMNS} is a comma-separated list of key columns (timestamp and tags)
+	//var pk []string
+
+	if p.TimestampColumn != "" {
+		//pk = append(pk, quoteIdent(p.TimestampColumn))
+		columns = append(columns, fmt.Sprintf("%s %s", quoteIdent(p.TimestampColumn), p.Convert.Timestamp))
+	}
+
+	for _, tag := range metric.TagList() {
+		//pk = append(pk, quoteIdent(tag.Key))
+		columns = append(columns, fmt.Sprintf("%s %s", quoteIdent(tag.Key), p.Convert.Text))
+	}
+
+	var datatype string
+	for _, field := range metric.FieldList() {
+		datatype = p.deriveDatatype(field.Value)
+		columns = append(columns, fmt.Sprintf("%s %s", quoteIdent(field.Key), datatype))
+	}
+
+	query := p.TableTemplate
+	query = strings.Replace(query, "{TABLE}", quoteIdent(metric.Name()), -1)
+	query = strings.Replace(query, "{TABLELITERAL}", quoteStr(metric.Name()), -1)
+	query = strings.Replace(query, "{COLUMNS}", strings.Join(columns, ","), -1)
+	//query = strings.Replace(query, "{KEY_COLUMNS}", strings.Join(pk, ","), -1)
+
+	return query
+}
+
+func (p *SQL) generateInsert(tablename string, columns []string) string {
+	var placeholders, quotedColumns []string
+	for _, column := range columns {
+		quotedColumns = append(quotedColumns, quoteIdent(column))
+	}
+	if p.Driver == "pgx" {
+		// Postgres uses $1 $2 $3 as placeholders
+		for i := 0; i < len(columns); i++ {
+			placeholders = append(placeholders, fmt.Sprintf("$%d", i+1))
+		}
+	} else {
+		// Everything else uses ? ? ? as placeholders
+		for i := 0; i < len(columns); i++ {
+			placeholders = append(placeholders, "?")
+		}
+	}
+
+	return fmt.Sprintf("INSERT INTO %s(%s) VALUES(%s)",
+		quoteIdent(tablename),
+		strings.Join(quotedColumns, ","),
+		strings.Join(placeholders, ","))
+}
+
+func (p *SQL) tableExists(tableName string) bool {
+	stmt := strings.Replace(p.TableExistsTemplate, "{TABLE}", quoteIdent(tableName), -1)
+
+	_, err := p.db.Exec(stmt)
+	return err == nil
+}
+
+func (p *SQL) Write(metrics []telegraf.Metric) error {
+	for _, metric := range metrics {
+		tablename := metric.Name()
+
+		// create table if needed
+		if !p.tables[tablename] && !p.tableExists(tablename) {
+			createStmt := p.generateCreateTable(metric)
+			_, err := p.db.Exec(createStmt)
+			if err != nil {
+				return err
+			}
+			p.tables[tablename] = true
+		}
+
+		var columns []string
+		var values []interface{}
+
+		if p.TimestampColumn != "" {
+			columns = append(columns, p.TimestampColumn)
+			values = append(values, metric.Time())
+		}
+
+		for column, value := range metric.Tags() {
+			columns = append(columns, column)
+			values = append(values, value)
+		}
+
+		for column, value := range metric.Fields() {
+			columns = append(columns, column)
+			values = append(values, value)
+		}
+
+		sql := p.generateInsert(tablename, columns)
+		_, err := p.db.Exec(sql, values...)
+
+		if err != nil {
+			// check if insert error was caused by column mismatch
+			p.Log.Errorf("Error during insert: %v, %v", err, sql)
+			return err
+		}
+	}
+	return nil
+}
+
+func init() {
+	outputs.Add("sql", func() telegraf.Output { return newSQL() })
+}
+
+func newSQL() *SQL {
+	return &SQL{
+		TableTemplate:       "CREATE TABLE {TABLE}({COLUMNS})",
+		TableExistsTemplate: "SELECT 1 FROM {TABLE} LIMIT 1",
+		TimestampColumn:     "timestamp",
+		Convert: ConvertStruct{
+			Integer:      "INT",
+			Real:         "DOUBLE",
+			Text:         "TEXT",
+			Timestamp:    "TIMESTAMP",
+			Defaultvalue: "TEXT",
+			Unsigned:     "UNSIGNED",
+		},
+	}
+}
--- a/plugins/outputs/sql/sql_test.go
+++ b/plugins/outputs/sql/sql_test.go
@ -0,0 +1,329 @@
+package sql
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+func TestSqlQuote(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+}
+
+func TestSqlCreateStatement(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+}
+
+func TestSqlInsertStatement(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+}
+
+func pwgen(n int) string {
+	charset := []byte("abcdedfghijklmnopqrstABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+
+	nchars := len(charset)
+	buffer := make([]byte, n)
+
+	for i := range buffer {
+		buffer[i] = charset[rand.Intn(nchars)]
+	}
+
+	return string(buffer)
+}
+
+func stableMetric(
+	name string,
+	tags []telegraf.Tag,
+	fields []telegraf.Field,
+	tm time.Time,
+	tp ...telegraf.ValueType,
+) telegraf.Metric {
+	// We want to compare the output of this plugin with expected
+	// output. Maps don't preserve order so comparison fails. There's
+	// no metric constructor that takes a slice of tag and slice of
+	// field, just the one that takes maps.
+	//
+	// To preserve order, construct the metric without tags and fields
+	// and then add them using AddTag and AddField.  Those are stable.
+	m := metric.New(name, map[string]string{}, map[string]interface{}{}, tm, tp...)
+	for _, tag := range tags {
+		m.AddTag(tag.Key, tag.Value)
+	}
+	for _, field := range fields {
+		m.AddField(field.Key, field.Value)
+	}
+	return m
+}
+
+var (
+	// 2021-05-17T22:04:45+00:00
+	// or 2021-05-17T16:04:45-06:00
+	ts = time.Unix(1621289085, 0).UTC()
+
+	testMetrics = []telegraf.Metric{
+		stableMetric(
+			"metric_one",
+			[]telegraf.Tag{
+				{
+					Key:   "tag_one",
+					Value: "tag1",
+				},
+				{
+					Key:   "tag_two",
+					Value: "tag2",
+				},
+			},
+			[]telegraf.Field{
+				{
+					Key:   "int64_one",
+					Value: int64(1234),
+				},
+				{
+					Key:   "int64_two",
+					Value: int64(2345),
+				},
+			},
+			ts,
+		),
+		stableMetric(
+			"metric_two",
+			[]telegraf.Tag{
+				{
+					Key:   "tag_three",
+					Value: "tag3",
+				},
+			},
+			[]telegraf.Field{
+				{
+					Key:   "string_one",
+					Value: "string1",
+				},
+			},
+			ts,
+		),
+		stableMetric( //test spaces in metric, tag, and field names
+			"metric three",
+			[]telegraf.Tag{
+				{
+					Key:   "tag four",
+					Value: "tag4",
+				},
+			},
+			[]telegraf.Field{
+				{
+					Key:   "string two",
+					Value: "string2",
+				},
+			},
+			ts,
+		),
+	}
+)
+
+func TestMysqlIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	initdb, err := filepath.Abs("testdata/mariadb/initdb")
+	require.NoError(t, err)
+
+	// initdb/script.sql creates this database
+	const dbname = "foo"
+
+	// The mariadb image lets you set the root password through an env
+	// var. We'll use root to insert and query test data.
+	const username = "root"
+
+	password := pwgen(32)
+	outDir, err := ioutil.TempDir("", "tg-mysql-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(outDir)
+
+	ctx := context.Background()
+	req := testcontainers.GenericContainerRequest{
+		ContainerRequest: testcontainers.ContainerRequest{
+			Image: "mariadb",
+			Env: map[string]string{
+				"MARIADB_ROOT_PASSWORD": password,
+			},
+			BindMounts: map[string]string{
+				initdb: "/docker-entrypoint-initdb.d",
+				outDir: "/out",
+			},
+			ExposedPorts: []string{"3306/tcp"},
+			WaitingFor:   wait.ForListeningPort("3306/tcp"),
+		},
+		Started: true,
+	}
+	mariadbContainer, err := testcontainers.GenericContainer(ctx, req)
+	require.NoError(t, err, "starting container failed")
+	defer func() {
+		require.NoError(t, mariadbContainer.Terminate(ctx), "terminating container failed")
+	}()
+
+	// Get the connection details from the container
+	host, err := mariadbContainer.Host(ctx)
+	require.NoError(t, err, "getting container host address failed")
+	require.NotEmpty(t, host)
+	natPort, err := mariadbContainer.MappedPort(ctx, "3306/tcp")
+	require.NoError(t, err, "getting container host port failed")
+	port := natPort.Port()
+	require.NotEmpty(t, port)
+
+	//use the plugin to write to the database
+	address := fmt.Sprintf("%v:%v@tcp(%v:%v)/%v",
+		username, password, host, port, dbname,
+	)
+	p := newSQL()
+	p.Log = testutil.Logger{}
+	p.Driver = "mysql"
+	p.DataSourceName = address
+	//p.Convert.Timestamp = "TEXT" //disable mysql default current_timestamp()
+	p.InitSQL = "SET sql_mode='ANSI_QUOTES';"
+
+	require.NoError(t, p.Connect())
+	require.NoError(t, p.Write(
+		testMetrics,
+	))
+
+	//dump the database
+	var rc int
+	rc, err = mariadbContainer.Exec(ctx, []string{
+		"bash",
+		"-c",
+		"mariadb-dump --user=" + username +
+			" --password=" + password +
+			" --compact --skip-opt " +
+			dbname +
+			" > /out/dump",
+	})
+	require.NoError(t, err)
+	require.Equal(t, 0, rc)
+	dumpfile := filepath.Join(outDir, "dump")
+	require.FileExists(t, dumpfile)
+
+	//compare the dump to what we expected
+	expected, err := ioutil.ReadFile("testdata/mariadb/expected.sql")
+	require.NoError(t, err)
+	actual, err := ioutil.ReadFile(dumpfile)
+	require.NoError(t, err)
+	require.Equal(t, string(expected), string(actual))
+}
+
+func TestPostgresIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	initdb, err := filepath.Abs("testdata/postgres/initdb")
+	require.NoError(t, err)
+
+	// initdb/init.sql creates this database
+	const dbname = "foo"
+
+	// default username for postgres is postgres
+	const username = "postgres"
+
+	password := pwgen(32)
+	outDir, err := ioutil.TempDir("", "tg-postgres-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(outDir)
+
+	ctx := context.Background()
+	req := testcontainers.GenericContainerRequest{
+		ContainerRequest: testcontainers.ContainerRequest{
+			Image: "postgres",
+			Env: map[string]string{
+				"POSTGRES_PASSWORD": password,
+			},
+			BindMounts: map[string]string{
+				initdb: "/docker-entrypoint-initdb.d",
+				outDir: "/out",
+			},
+			ExposedPorts: []string{"5432/tcp"},
+			WaitingFor:   wait.ForListeningPort("5432/tcp"),
+		},
+		Started: true,
+	}
+	cont, err := testcontainers.GenericContainer(ctx, req)
+	require.NoError(t, err, "starting container failed")
+	defer func() {
+		require.NoError(t, cont.Terminate(ctx), "terminating container failed")
+	}()
+
+	// Get the connection details from the container
+	host, err := cont.Host(ctx)
+	require.NoError(t, err, "getting container host address failed")
+	require.NotEmpty(t, host)
+	natPort, err := cont.MappedPort(ctx, "5432/tcp")
+	require.NoError(t, err, "getting container host port failed")
+	port := natPort.Port()
+	require.NotEmpty(t, port)
+
+	//use the plugin to write to the database
+	// host, port, username, password, dbname
+	address := fmt.Sprintf("postgres://%v:%v@%v:%v/%v",
+		username, password, host, port, dbname,
+	)
+	p := newSQL()
+	p.Log = testutil.Logger{}
+	p.Driver = "pgx"
+	p.DataSourceName = address
+
+	require.NoError(t, p.Connect())
+	require.NoError(t, p.Write(
+		testMetrics,
+	))
+
+	//dump the database
+	//psql -u postgres
+	var rc int
+	rc, err = cont.Exec(ctx, []string{
+		"bash",
+		"-c",
+		"pg_dump" +
+			" --username=" + username +
+			//" --password=" + password +
+			//			" --compact --skip-opt " +
+			" --no-comments" +
+			//" --data-only" +
+			" " + dbname +
+			// pg_dump's output has comments that include build info
+			// of postgres and pg_dump. The build info changes with
+			// each release. To prevent these changes from causing the
+			// test to fail, we strip out comments. Also strip out
+			// blank lines.
+			"|grep -E -v '(^--|^$)'" +
+			" > /out/dump 2>&1",
+	})
+	require.NoError(t, err)
+	require.Equal(t, 0, rc)
+	dumpfile := filepath.Join(outDir, "dump")
+	require.FileExists(t, dumpfile)
+
+	//compare the dump to what we expected
+	expected, err := ioutil.ReadFile("testdata/postgres/expected.sql")
+	require.NoError(t, err)
+	actual, err := ioutil.ReadFile(dumpfile)
+	require.NoError(t, err)
+	require.Equal(t, string(expected), string(actual))
+}
--- a/plugins/outputs/sql/sqlite.go
+++ b/plugins/outputs/sql/sqlite.go
@ -0,0 +1,15 @@
+// +build !mips
+// +build !mipsle
+// +build !s390x
+// +build !ppc64le
+// +build !windows
+// +build !freebsd
+
+package sql
+
+// The modernc.org sqlite driver isn't supported on all
+// platforms. Register it with build constraints to prevent build
+// failures on unsupported platforms.
+import (
+	_ "modernc.org/sqlite" // Register sqlite sql driver
+)
--- a/plugins/outputs/sql/sqlite_test.go
+++ b/plugins/outputs/sql/sqlite_test.go
@ -0,0 +1,134 @@
+// +build linux
+// +build 386 amd64 arm arm64
+
+package sql
+
+import (
+	gosql "database/sql"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSqlite(t *testing.T) {
+	outDir, err := ioutil.TempDir("", "tg-sqlite-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(outDir)
+
+	dbfile := filepath.Join(outDir, "db")
+
+	// Use the plugin to write to the database address :=
+	// fmt.Sprintf("file:%v", dbfile)
+	address := dbfile // accepts a path or a file: URI
+	p := newSQL()
+	p.Log = testutil.Logger{}
+	p.Driver = "sqlite"
+	p.DataSourceName = address
+
+	require.NoError(t, p.Connect())
+	require.NoError(t, p.Write(
+		testMetrics,
+	))
+
+	//read directly from the database
+	db, err := gosql.Open("sqlite", address)
+	require.NoError(t, err)
+	defer db.Close()
+
+	var countMetricOne int
+	require.NoError(t, db.QueryRow("select count(*) from metric_one").Scan(&countMetricOne))
+	require.Equal(t, 1, countMetricOne)
+
+	var countMetricTwo int
+	require.NoError(t, db.QueryRow("select count(*) from metric_one").Scan(&countMetricTwo))
+	require.Equal(t, 1, countMetricTwo)
+
+	var rows *gosql.Rows
+
+	// Check that tables were created as expected
+	rows, err = db.Query("select sql from sqlite_master")
+	require.NoError(t, err)
+	var sql string
+	require.True(t, rows.Next())
+	require.NoError(t, rows.Scan(&sql))
+	require.Equal(t,
+		`CREATE TABLE "metric_one"("timestamp" TIMESTAMP,"tag_one" TEXT,"tag_two" TEXT,"int64_one" INT,"int64_two" INT)`,
+		sql,
+	)
+	require.True(t, rows.Next())
+	require.NoError(t, rows.Scan(&sql))
+	require.Equal(t,
+		`CREATE TABLE "metric_two"("timestamp" TIMESTAMP,"tag_three" TEXT,"string_one" TEXT)`,
+		sql,
+	)
+	require.True(t, rows.Next())
+	require.NoError(t, rows.Scan(&sql))
+	require.Equal(t,
+		`CREATE TABLE "metric three"("timestamp" TIMESTAMP,"tag four" TEXT,"string two" TEXT)`,
+		sql,
+	)
+	require.False(t, rows.Next())
+	require.NoError(t, rows.Close()) //nolint:sqlclosecheck
+
+	// sqlite stores dates as strings. They may be in the local
+	// timezone. The test needs to parse them back into a time.Time to
+	// check them.
+	//timeLayout := "2006-01-02 15:04:05 -0700 MST"
+	timeLayout := "2006-01-02T15:04:05Z"
+	var actualTime time.Time
+
+	// Check contents of tables
+	rows, err = db.Query("select timestamp, tag_one, tag_two, int64_one, int64_two from metric_one")
+	require.NoError(t, err)
+	require.True(t, rows.Next())
+	var (
+		a    string
+		b, c string
+		d, e int64
+	)
+	require.NoError(t, rows.Scan(&a, &b, &c, &d, &e))
+	actualTime, err = time.Parse(timeLayout, a)
+	require.NoError(t, err)
+	require.Equal(t, ts, actualTime.UTC())
+	require.Equal(t, "tag1", b)
+	require.Equal(t, "tag2", c)
+	require.Equal(t, int64(1234), d)
+	require.Equal(t, int64(2345), e)
+	require.False(t, rows.Next())
+	require.NoError(t, rows.Close()) //nolint:sqlclosecheck
+
+	rows, err = db.Query("select timestamp, tag_three, string_one from metric_two")
+	require.NoError(t, err)
+	require.True(t, rows.Next())
+	var (
+		f, g, h string
+	)
+	require.NoError(t, rows.Scan(&f, &g, &h))
+	actualTime, err = time.Parse(timeLayout, f)
+	require.NoError(t, err)
+	require.Equal(t, ts, actualTime.UTC())
+	require.Equal(t, "tag3", g)
+	require.Equal(t, "string1", h)
+	require.False(t, rows.Next())
+	require.NoError(t, rows.Close()) //nolint:sqlclosecheck
+
+	rows, err = db.Query(`select timestamp, "tag four", "string two" from "metric three"`)
+	require.NoError(t, err)
+	require.True(t, rows.Next())
+	var (
+		i, j, k string
+	)
+	require.NoError(t, rows.Scan(&i, &j, &k))
+	actualTime, err = time.Parse(timeLayout, i)
+	require.NoError(t, err)
+	require.Equal(t, ts, actualTime.UTC())
+	require.Equal(t, "tag4", j)
+	require.Equal(t, "string2", k)
+	require.False(t, rows.Next())
+	require.NoError(t, rows.Close()) //nolint:sqlclosecheck
+}
--- a/plugins/outputs/sql/testdata/mariadb/expected.sql
+++ b/plugins/outputs/sql/testdata/mariadb/expected.sql
@ -0,0 +1,36 @@
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `bar` (
+  `baz` int(11) DEFAULT NULL
+);
+/*!40101 SET character_set_client = @saved_cs_client */;
+INSERT INTO `bar` VALUES (1);
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `metric three` (
+  `timestamp` timestamp NOT NULL DEFAULT current_timestamp(),
+  `tag four` text DEFAULT NULL,
+  `string two` text DEFAULT NULL
+);
+/*!40101 SET character_set_client = @saved_cs_client */;
+INSERT INTO `metric three` VALUES ('2021-05-17 22:04:45','tag4','string2');
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `metric_one` (
+  `timestamp` timestamp NOT NULL DEFAULT current_timestamp(),
+  `tag_one` text DEFAULT NULL,
+  `tag_two` text DEFAULT NULL,
+  `int64_one` int(11) DEFAULT NULL,
+  `int64_two` int(11) DEFAULT NULL
+);
+/*!40101 SET character_set_client = @saved_cs_client */;
+INSERT INTO `metric_one` VALUES ('2021-05-17 22:04:45','tag1','tag2',1234,2345);
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `metric_two` (
+  `timestamp` timestamp NOT NULL DEFAULT current_timestamp(),
+  `tag_three` text DEFAULT NULL,
+  `string_one` text DEFAULT NULL
+);
+/*!40101 SET character_set_client = @saved_cs_client */;
+INSERT INTO `metric_two` VALUES ('2021-05-17 22:04:45','tag3','string1');
--- a/plugins/outputs/sql/testdata/mariadb/initdb/script.sql
+++ b/plugins/outputs/sql/testdata/mariadb/initdb/script.sql
@ -0,0 +1,4 @@
+create database foo;
+use foo;
+create table bar (baz int);
+insert into bar (baz) values (1);
--- a/plugins/outputs/sql/testdata/postgres/expected.sql
+++ b/plugins/outputs/sql/testdata/postgres/expected.sql
@ -0,0 +1,41 @@
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+SET default_tablespace = '';
+SET default_table_access_method = heap;
+CREATE TABLE public."metric three" (
+    "timestamp" timestamp without time zone,
+    "tag four" text,
+    "string two" text
+);
+ALTER TABLE public."metric three" OWNER TO postgres;
+CREATE TABLE public.metric_one (
+    "timestamp" timestamp without time zone,
+    tag_one text,
+    tag_two text,
+    int64_one integer,
+    int64_two integer
+);
+ALTER TABLE public.metric_one OWNER TO postgres;
+CREATE TABLE public.metric_two (
+    "timestamp" timestamp without time zone,
+    tag_three text,
+    string_one text
+);
+ALTER TABLE public.metric_two OWNER TO postgres;
+COPY public."metric three" ("timestamp", "tag four", "string two") FROM stdin;
+2021-05-17 22:04:45	tag4	string2
+\.
+COPY public.metric_one ("timestamp", tag_one, tag_two, int64_one, int64_two) FROM stdin;
+2021-05-17 22:04:45	tag1	tag2	1234	2345
+\.
+COPY public.metric_two ("timestamp", tag_three, string_one) FROM stdin;
+2021-05-17 22:04:45	tag3	string1
+\.
--- a/plugins/outputs/sql/testdata/postgres/initdb/init.sql
+++ b/plugins/outputs/sql/testdata/postgres/initdb/init.sql
@ -0,0 +1,2 @@
+create database foo;
+