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DB 2
The DdlUtils support for IBM DB2 is based upon version 7. The datatypes and SQL elements in DB2 are described in the DB2 SQL Reference V7. Some specifics related to the JDBC driver and suggested typemappings can also be found here.
DdlUtils provides two platforms for DB2, one for version 7 and one for version 8 and above, which mainly differ in the maximum identifier lengths (see below for details.) Note that you have to specify the v8 platform manually as the auto detection currently always selects the v7 platform.
Platform identifiers:
- DB2 for the v7 platform
- DB2v8 for the v8 platform
Recognized JDBC drivers:
- com.ibm.db2.jcc.DB2Driver
- COM.ibm.db2.jdbc.app.DB2Driver
- COM.ibm.db2os390.sqlj.jdbc.DB2SQLJDriver
- com.ibm.as400.access.AS400JDBCDriver
Recognized JDBC sub protocols:
- jdbc:db2
- jdbc:db2os390
- jdbc:2os390sqlj
- jdbc:as400
| The database supports SQL comments | yes |
| The database supports delimited identifiers | yes |
| The database's maximum identifier length | 18 for the v7 platform The v8 platform supports 128 characters for identifiers (e.g. table names), 30 characters for column names, and 18 for constraints and foreign keys |
| The database supports default values for LONG types | yes |
| DdlUtils uses sequences for identity columns | no |
| The database supports non-primary key columns as identity columns | yes |
| The database allows INSERT/UPDATE statements to set values for identity columns | yes |
| DdlUtils can read back the auto-generated value of an identity column | yes |
| The database supports non-unique indices | yes |
| DdlUtils can create a database via JDBC | no |
| DdlUtils can drop a database via JDBC | no |
| JDBC Type | Database Type | Additional comments |
|---|---|---|
| ARRAY | BLOB | Will be read back as BLOB |
| BIGINT | BIGINT | |
| BINARY | CHAR(n) FOR BIT DATA | |
| BIT | SMALLINT | DB2 has no native boolean type Will be read back as SMALLINT |
| BLOB | BLOB | |
| BOOLEAN | SMALLINT | DB2 has no native boolean type Will be read back as SMALLINT |
| CHAR | CHAR | |
| CLOB | CLOB | |
| DATALINK | DATALINK | |
| DATE | DATE | |
| DECIMAL | DECIMAL | |
| DISTINCT | DISTINCT | |
| DOUBLE | DOUBLE | |
| FLOAT | DOUBLE | |
| INTEGER | INTEGER | |
| JAVA_OBJECT | BLOB | Will be read back as BLOB |
| LONGVARBINARY | LONG VARCHAR FOR BIT DATA | |
| LONGVARCHAR | LONG VARCHAR | |
| NULL | LONG VARCHAR FOR BIT DATA | Will be read back as LONGVARBINARY |
| NUMERIC | DECIMAL | Will be read back as DECIMAL |
| OTHER | BLOB | Will be read back as BLOB |
| REAL | REAL | |
| REF | REF | |
| SMALLINT | SMALLINT | |
| STRUCT | BLOB | Will be read back as BLOB |
| TIME | TIME | |
| TIMESTAMP | TIMESTAMP | |
| TINYINT | SMALLINT | Will be read back as SMALLINT |
| VARBINARY | VARCHAR(n) FOR BIT DATA | |
| VARCHAR | VARCHAR |