Multi-Database Support: Oracle, DB2, HANA, MSSQL

TeaQL gained four new database backends in a single sprint.

New Databases

+ teaql-oracle: Oracle database support
+ teaql-db2: IBM DB2 support
+ teaql-hana: SAP HANA support
+ teaql-mssql: Microsoft SQL Server support

Each module includes:

• Database-specific DDL generation (ensureTables)
• Java ↔ SQL type mapping
• Custom SQL syntax handling

JdbcTemplate Migration

Migrated from raw JDBC to Spring JdbcTemplate for better resource management, connection pooling, and exception handling.

MySQL Improvements

• tinyint → Boolean mapping
• int → Integer mapping
• timestamp → LocalDateTime mapping
• GBK charset ORDER BY sorting fix
• Semicolon handling fix

Oracle Customizations

• Primary table INNER JOIN, auxiliary table LEFT JOIN
• Partition fix
• Column label handling

Pagination

Native pagination with page and pageSize:

Q.orders()
    .filter(Q.orders().status().eq("ACTIVE"))
    .page(1, 20)
    .executeForList(ctx);