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Dialects
Overview
Dialects absorb differences in databases and drivers. A typical function of dialects is to resolve the type mappings between Kotlin and databases.
The classes representing dialects are contained in separate modules (artifacts), and the choice of which module to use must be based on the destination database and connectivity type.
| Database | Type | Artifact ID | Dialect Class |
|---|---|---|---|
| H2 Database Engine | JDBC | komapper-dialect-h2-jdbc | H2JdbcSqlDialect |
| H2 Database Engine | R2DBC | komapper-dialect-h2-r2dbc | H2R2dbcSqlDialect |
| MariaDB | JDBC | komapper-dialect-mariadb-jdbc | MariaDbJdbcDialect |
| MySQL | JDBC | komapper-dialect-mysql-jdbc | MySqlJdbcDialect |
| Oracle Database | JDBC | komapper-dialect-oracle-jdbc | OracleJdbcDialect |
| Oracle Database | R2DBC | komapper-dialect-oracle-r2dbc | OracleR2dbcDialect |
| PostgreSQL | JDBC | komapper-dialect-postgresql-jdbc | PostgreSqlJdbcDialect |
| PostgreSQL | R2DBC | komapper-dialect-postgresql-r2dbc | PostgreSqlR2dbcDialect |
| SQL Server | JDBC | komapper-dialect-sqlserver-jdbc | SqlServerJdbcDialect |
| SQL Server | R2DBC | komapper-dialect-sqlserver-r2dbc | SqlServerR2dbcDialect |
To use a dialect, specify the Artifact ID above in the Gradle dependencies declaration.
val komapperVersion: String by project
dependencies {
implementation("org.komapper:komapper-dialect-h2-jdbc:$komapperVersion")
}
Support for kotlinx-datetime
Komapper supports following data types of kotlinx-datetime:
- kotlinx.datetime.Instant
- kotlinx.datetime.LocalDate
- kotlinx.datetime.LocalDateTime
To use these types, declare kotlinx-datetime in the Gradle dependencies declaration as follows:
dependencies {
implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2")
}
Also, declare komapper-datetime-jdbc or komapper-datetime-r2dbc:
val komapperVersion: String by project
dependencies {
runtimeOnly("org.komapper:komapper-datetime-jdbc:$komapperVersion")
}
Note
If you use one of the Starters , you do not need to declarekomapper-datetime-jdbc and komapper-datetime-r2dbc.
H2 - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | NUMERIC |
| java.math.BigInteger | NUMERIC |
| java.sql.Array | ARRAY |
| java.sql.Blob | BLOB |
| java.sql.Clob | CLOB |
| java.sql.NClob | CLOB |
| java.sql.SQLXML | CLOB |
| java.time.Instant | TIMESTAMP WITH TIME ZONE |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | TIMESTAMP |
| java.time.LocalTime | TIME |
| java.time.OffsetDateTime | TIMESTAMP WITH TIME ZONE |
| java.util.UUID | UUID |
| kotlin.Any | JAVA_OBJECT |
| kotlin.Boolean | BOOLEAN |
| kotlin.Byte | TINYINT |
| kotlin.ByteArray | BINARY |
| kotlin.Double | DOUBLE |
| kotlin.Float | REAL |
| kotlin.Int | INT |
| kotlin.Long | BIGINT |
| kotlin.Short | SMALLINT |
| kotlin.String | VARCHAR |
| kotlin.UByte | SMALLINT |
| kotlin.UInt | BIGINT |
| kotlin.UShort | INT |
| kotlinx.datetime.Instant | TIMESTAMP WITH TIME ZONE |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | TIMESTAMP |
| enum class | VARCHAR |
H2 - R2DBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| io.r2dbc.spi.Blob | BLOB |
| io.r2dbc.spi.Clob | CLOB |
| java.math.BigDecimal | NUMERIC |
| java.math.BigInteger | NUMERIC |
| java.time.Instant | TIMESTAMP WITH TIME ZONE |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | TIMESTAMP |
| java.time.LocalTime | TIME |
| java.time.OffsetDateTime | TIMESTAMP WITH TIME ZONE |
| java.util.UUID | UUID |
| kotlin.Any | N/A |
| kotlin.Boolean | BOOLEAN |
| kotlin.Byte | TINYINT |
| kotlin.ByteArray | BINARY |
| kotlin.Double | DOUBLE |
| kotlin.Float | REAL |
| kotlin.Int | INT |
| kotlin.Long | BIGINT |
| kotlin.Short | SMALLINT |
| kotlin.String | VARCHAR |
| kotlin.UByte | SMALLINT |
| kotlin.UInt | BIGINT |
| kotlin.UShort | INT |
| kotlinx.datetime.Instant | TIMESTAMP WITH TIME ZONE |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | TIMESTAMP |
| enum class | VARCHAR |
MariaDB - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | DECIMAL |
| java.math.BigInteger | DECIMAL |
| java.sql.Array | N/A |
| java.sql.Blob | BLOB |
| java.sql.Clob | TEXT |
| java.sql.NClob | TEXT |
| java.sql.SQLXML | TEXT |
| java.time.Instant | TIMESTAMP |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | DATETIME |
| java.time.LocalTime | TIME |
| java.time.OffsetDateTime | TIMESTAMP |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | BIT(1), BOOLEAN |
| kotlin.Byte | TINYINT |
| kotlin.ByteArray | VARBINARY |
| kotlin.Double | DOUBLE |
| kotlin.Float | FLOAT |
| kotlin.Int | INT |
| kotlin.Long | BIGINT |
| kotlin.Short | SMALLINT |
| kotlin.String | VARCHAR |
| kotlin.UByte | SMALLINT |
| kotlin.UInt | BIGINT |
| kotlin.UShort | INT |
| kotlinx.datetime.Instant | TIMESTAMP |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | DATETIME |
| enum class | VARCHAR |
MySQL - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | DECIMAL |
| java.math.BigInteger | DECIMAL |
| java.sql.Array | N/A |
| java.sql.Blob | BLOB |
| java.sql.Clob | TEXT |
| java.sql.NClob | TEXT |
| java.sql.SQLXML | TEXT |
| java.time.Instant | TIMESTAMP |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | DATETIME |
| java.time.LocalTime | TIME |
| java.time.OffsetDateTime | TIMESTAMP |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | BIT(1), BOOLEAN |
| kotlin.Byte | TINYINT |
| kotlin.ByteArray | VARBINARY |
| kotlin.Double | DOUBLE |
| kotlin.Float | FLOAT |
| kotlin.Int | INT |
| kotlin.Long | BIGINT |
| kotlin.Short | SMALLINT |
| kotlin.String | VARCHAR |
| kotlin.UByte | SMALLINT |
| kotlin.UInt | BIGINT |
| kotlin.UShort | INT |
| kotlinx.datetime.Instant | TIMESTAMP |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | DATETIME |
| enum class | VARCHAR |
Oracle - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | NUMBER |
| java.math.BigInteger | NUMBER |
| java.sql.Array | N/A |
| java.sql.Blob | BLOB |
| java.sql.Clob | CLOB |
| java.sql.NClob | N/A |
| java.sql.SQLXML | N/A |
| java.time.Instant | TIMESTAMP WITH TIME ZONE |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | TIMESTAMP |
| java.time.LocalTime | TIME |
| java.time.OffsetDateTime | TIMESTAMP WITH TIME ZONE |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | NUMBER |
| kotlin.Byte | NUMBER |
| kotlin.ByteArray | RAW |
| kotlin.Double | FLOAT |
| kotlin.Float | FLOAT |
| kotlin.Int | NUMBER |
| kotlin.Long | NUMBER |
| kotlin.Short | NUMBER |
| kotlin.String | VARCHAR2 |
| kotlin.UByte | NUMBER |
| kotlin.UInt | NUMBER |
| kotlin.UShort | NUMBER |
| kotlinx.datetime.Instant | TIMESTAMP WITH TIME ZONE |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | TIMESTAMP |
| enum class | VARCHAR2 |
Oracle - R2DBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| io.r2dbc.spi.Blob | BLOB |
| io.r2dbc.spi.Clob | CLOB |
| java.math.BigDecimal | NUMBER |
| java.math.BigInteger | NUMBER |
| java.time.Duration | INTERVAL DAY TO SECOND |
| java.time.Instant | TIMESTAMP WITH TIME ZONE |
| java.time.LocalDate | DATE |
| java.time.LocalDateTime | TIMESTAMP |
| java.time.LocalTime | TIME |
| java.time.Period | INTERVAL YEAR TO MONTH |
| java.time.OffsetDateTime | TIMESTAMP WITH TIME ZONE |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | NUMBER |
| kotlin.Byte | NUMBER |
| kotlin.ByteArray | RAW |
| kotlin.Double | FLOAT |
| kotlin.Float | FLOAT |
| kotlin.Int | NUMBER |
| kotlin.Long | NUMBER |
| kotlin.Short | NUMBER |
| kotlin.String | VARCHAR2 |
| kotlin.UByte | NUMBER |
| kotlin.UInt | NUMBER |
| kotlin.UShort | NUMBER |
| kotlinx.datetime.Instant | TIMESTAMP WITH TIME ZONE |
| kotlinx.datetime.LocalDate | DATE |
| kotlinx.datetime.LocalDateTime | TIMESTAMP |
| enum class | VARCHAR2 |
PostgreSQL - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | numeric, decimal |
| java.math.BigInteger | numeric, decimal |
| java.sql.Array | array of data type |
| java.sql.Blob | N/A |
| java.sql.Clob | N/A |
| java.sql.NClob | N/A |
| java.sql.SQLXML | xml |
| java.time.Instant | timestamp with time zone |
| java.time.LocalDate | date |
| java.time.LocalDateTime | timestamp |
| java.time.LocalTime | time |
| java.time.OffsetDateTime | timestamp with time zone |
| java.util.UUID | uuid |
| kotlin.Any | N/A |
| kotlin.Boolean | boolean, bool |
| kotlin.Byte | smallint |
| kotlin.ByteArray | bytea |
| kotlin.Double | double precision, float8 |
| kotlin.Float | real |
| kotlin.Int | integer, int, int4, serial |
| kotlin.Long | bigint, int8, bigserial, serial8 |
| kotlin.Short | smallint, int2, smallserial, serial2 |
| kotlin.String | character varying, varchar, text |
| kotlin.UByte | smallint, int2, smallserial, serial2 |
| kotlin.UInt | bigint, int8, bigserial, serial8 |
| kotlin.UShort | integer, int, int4, serial |
| kotlinx.datetime.Instant | timestamp with time zone |
| kotlinx.datetime.LocalDate | date |
| kotlinx.datetime.LocalDateTime | timestamp |
| enum class | character varying, varchar, text |
PostgreSQL - R2DBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| io.r2dbc.postgresql.codec.Interval | interval |
| io.r2dbc.postgresql.codec.Json | json, jsonb |
| io.r2dbc.spi.Blob | bytea |
| io.r2dbc.spi.Clob | text |
| java.math.BigDecimal | numeric, decimal |
| java.math.BigInteger | numeric, decimal |
| java.time.Instant | timestamp with time zone |
| java.time.LocalDate | date |
| java.time.LocalDateTime | timestamp |
| java.time.LocalTime | time |
| java.time.OffsetDateTime | timestamp with time zone |
| java.util.UUID | uuid |
| kotlin.Any | N/A |
| kotlin.Array | array of data type |
| kotlin.Boolean | boolean, bool |
| kotlin.Byte | smallint |
| kotlin.ByteArray | bytea |
| kotlin.Double | double precision, float8 |
| kotlin.Float | real |
| kotlin.Int | integer, int, int4, serial |
| kotlin.Long | bigint, int8, bigserial, serial8 |
| kotlin.Short | smallint, int2, smallserial, serial2 |
| kotlin.String | character varying, varchar, text |
| kotlin.UByte | smallint, int2, smallserial, serial2 |
| kotlin.UInt | bigint, int8, bigserial, serial8 |
| kotlin.UShort | integer, int, int4, serial |
| kotlinx.datetime.Instant | timestamp with time zone |
| kotlinx.datetime.LocalDate | date |
| kotlinx.datetime.LocalDateTime | timestamp |
| enum class | character varying, varchar, text |
SQL Server - JDBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| java.math.BigDecimal | decimal |
| java.math.BigInteger | decimal |
| java.sql.Array | N/A |
| java.sql.Blob | varbinary(max) |
| java.sql.Clob | text |
| java.sql.NClob | N/A |
| java.sql.SQLXML | xml |
| java.time.Instant | datetimeoffset |
| java.time.LocalDate | date |
| java.time.LocalDateTime | datetime2 |
| java.time.LocalTime | time |
| java.time.OffsetDateTime | datetimeoffset |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | bit |
| kotlin.Byte | smallint, tinyint |
| kotlin.ByteArray | varbinary |
| kotlin.Double | float |
| kotlin.Float | real |
| kotlin.Int | int |
| kotlin.Long | bigint |
| kotlin.Short | smallint |
| kotlin.String | varchar, nvarchar |
| kotlin.UByte | smallint |
| kotlin.UInt | bigint |
| kotlin.UShort | int |
| kotlinx.datetime.Instant | datetimeoffset |
| kotlinx.datetime.LocalDate | date |
| kotlinx.datetime.LocalDateTime | datetime2 |
| enum class | varchar, nvarchar |
SQL Server - R2DBC
The following table shows the data type mapping:
| Kotlin Type | Database Type |
|---|---|
| io.r2dbc.spi.Blob | varbinary(max) |
| io.r2dbc.spi.Clob | text |
| java.math.BigDecimal | decimal |
| java.math.BigInteger | decimal |
| java.time.Instant | datetimeoffset |
| java.time.LocalDate | date |
| java.time.LocalDateTime | datetime2 |
| java.time.LocalTime | time |
| java.time.OffsetDateTime | N/A |
| java.util.UUID | N/A |
| kotlin.Any | N/A |
| kotlin.Boolean | bit |
| kotlin.Byte | smallint, tinyint |
| kotlin.ByteArray | varbinary |
| kotlin.Double | float |
| kotlin.Float | real |
| kotlin.Int | int |
| kotlin.Long | bigint |
| kotlin.Short | smallint |
| kotlin.String | varchar, nvarchar |
| kotlin.UByte | smallint |
| kotlin.UInt | bigint |
| kotlin.UShort | int |
| kotlinx.datetime.Instant | datetimeoffset |
| kotlinx.datetime.LocalDate | date |
| kotlinx.datetime.LocalDateTime | datetimev |
| enum class | varchar, nvarchar |
Last modified May 4, 2022: Rename dialects (55d344f)