Lukas,
sorry for not getting back sooner with a testcase.
While writing this, I tested some more, and found additional information.
IF String.class is passed as type, the CHAR data type without length is
chosen.
IF SQLDataType.VARCHAR is passed as type, the CHAR data type without length
is chosen
IF SQLDataType.VARCHAR(10) is passed as type, the VARCHAR(10) data type is
chosen
I don't think this is appropriate behavior, especially for Java String
class. For other dialects (postgres, sqlite, H2 and Derby) it does the
right thing.
-o-o-o-o-
Setup of MYSQL;
docker run --name mysql -e MYSQL_ROOT_PASSWORD="" -e
MYSQL_ALLOW_EMPTY_PASSWORD=yes -e MYSQL_DATABASE=jdbc_test_db -p 3306:3306
-d mysql
And then run the code below. The First *insertInto()* will succeed and the
second *insertInto()* will fail, becase the createTable() will produce the
following SQL statement;
*create table `TESTTABLE`(`_identity` char null)*
I was digging quite a lot in the JOOQ code to find this, but I can't figure
out how it hangs together, and it seems that large sections are generated
and not handcoded. So I gave up.
package org.hedhman.niclas;
import com.mysql.cj.jdbc.MysqlDataSource;
import javax.sql.DataSource;
import org.jooq.Configuration;
import org.jooq.ConnectionProvider;
import org.jooq.DSLContext;
import org.jooq.DataType;
import org.jooq.Field;
import org.jooq.Name;
import org.jooq.Record;
import org.jooq.SQLDialect;
import org.jooq.Schema;
import org.jooq.Table;
import org.jooq.TransactionProvider;
import org.jooq.conf.RenderNameStyle;
import org.jooq.conf.Settings;
import org.jooq.impl.DSL;
import org.jooq.impl.DataSourceConnectionProvider;
import org.jooq.impl.DefaultConfiguration;
import org.jooq.impl.SQLDataType;
import org.jooq.impl.ThreadLocalTransactionProvider;
import org.junit.Test;
public class Experiment
{
@Test
public void test2()
throws Exception
{
String host = "127.0.0.1";
int port = 3306;
DataSource dataSource = rawDataSource(host,port);
Settings settings = new Settings().withRenderNameStyle(
RenderNameStyle.QUOTED );
SQLDialect dialect = SQLDialect.MYSQL;
Schema schema = DSL.schema( DSL.name( "POLYGENE" ) );
ConnectionProvider connectionProvider = new
DataSourceConnectionProvider( dataSource );
TransactionProvider transactionProvider = new
ThreadLocalTransactionProvider( connectionProvider, false );
Configuration configuration = new DefaultConfiguration()
.set( dialect )
.set( connectionProvider )
.set( transactionProvider )
.set( settings );
DSLContext dsl = DSL.using( configuration );
Field<String> identityColumn = DSL.field( DSL.name(
"_identity" ), String.class );
// Field<String> identityColumn = DSL.field( DSL.name(
"_identity" ), SQLDataType.VARCHAR );*// Field<String>
identityColumn = DSL.field( DSL.name( "_identity" ),
SQLDataType.VARCHAR(10) );*
Name tableName = DSL.name( "TESTTABLE" );
dsl.transaction( c -> { dsl.createTable( tableName )
.column( identityColumn ) .execute();
});
dsl.transaction( c -> {
Table<Record> table = DSL.table( tableName );
dsl.insertInto( table )
.set( identityColumn, "1" )
.execute();
});
dsl.transaction( c -> {
Table<Record> table = DSL.table( tableName );
dsl.insertInto( table )
.set( identityColumn, "12" )
.execute();
});
}
private DataSource rawDataSource( String host, int port )
throws Exception
{
MysqlDataSource datasource = new MysqlDataSource();
datasource.setUser( "root" );
datasource.setPassword( "" );
datasource.setUrl( "jdbc:mysql://" + host + ":" + port + "/jdbc_test_db" );
return datasource;
}
}
--
Niclas Hedhman, Software Developer
http://polygene.apache.org - New Energy for Java
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