What's wrong with COM.ibm.db2.jdbc.app.DB2Driver?

Question

Hello everybody,
first of all I posted this on
http://www-105.ibm.com/developerworks/java_df.nsf/AllViewTemplate?OpenForm&RestrictToCategory=33
so you can check the IBM forum as well, may be some IBM gurus can comment this...
I'm using the COM.ibm.db2.jdbc.app.Driver shipped with DB2Connect v6.1, v7.1 (tested both on NT and SunOS 5.6, 5.8), the database is DB2 v6, v7 running on an OS390. I am pretty confused:DatabaseMetaData.getProcedureColumns(catalog, schemaPattern, namePattern)cannot handle the namePattern parameter correct. It works only with "", null and "%". Passing any other value results in :COM.ibm.db2.jdbc.DB2Exception: [IBM][CLI Driver][DB2] SQL0206N  "PROCEDURE " ist in dem verwendeten Kontext ung�ltig.  SQLSTATE=42703
     at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throw_SQLException(SQLExceptionGenerator.java:241)
     at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throw_SQLException(SQLExceptionGenerator.java:186)
     at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.check_return_code(SQLExceptionGenerator.java:419)
     at COM.ibm.db2.jdbc.app.DB2DatabaseMetaData.getProcedures(DB2DatabaseMetaData.java:1446)I think that even if the pattern doesn't match any procedure the function should return an empty ResultSet. The only "solution" is to scroll all the procedures in the ResultSet until you find the passing ones. Does IBM think this is serious?
I have dug a bit and found another incompatibitly with the JDBC specification: the names of the result set columns returned by DatabaseMetaData.getProcedureColumns() as returned by the DB2Driver:
PROCEDURE_CAT
PROCEDURE_SCHEM
PROCEDURE_NAME
COLUMN_NAME
COLUMN_TYPE
DATA_TYPE
TYPE_NAME
COLUMN_SIZE
BUFFER_LENGTH
DECIMAL_DIGITS
NUM_PREC_RADIX
NULLABLE
REMARKS
Here comes the JDBC specification:
<quote>
Each procedure description has the the following columns:
PROCEDURE_CAT String => procedure catalog (may be null)
PROCEDURE_SCHEM String => procedure schema (may be null)
PROCEDURE_NAME String => procedure name
COLUMN_NAME String => column/parameter name
COLUMN_TYPE Short => kind of column/parameter:
procedureColumnUnknown - nobody knows
procedureColumnIn - IN parameter
procedureColumnInOut - INOUT parameter
procedureColumnOut - OUT parameter
procedureColumnReturn - procedure return value
procedureColumnResult - result column in ResultSet
DATA_TYPE short => SQL type from java.sql.Types
TYPE_NAME String => SQL type name, for a UDT type the type name is fully qualified
PRECISION int => precision
LENGTH int => length in bytes of data
SCALE short => scale
RADIX short => radix
NULLABLE short => can it contain NULL.
procedureNoNulls - does not allow NULL values
procedureNullable - allows NULL values
procedureNullableUnknown - nullability unknown
REMARKS String => comment describing parameter/column </quote>
I would appreciate your comments.
Regards,
Anton Maleev
IT Consultant, Software Engineer
Frankfurt, Germany
mailto: [email protected]

Answer 1

Futhermore, when you call DatabaseMetaData.getProcedures(catalog, schemaPattern, "%") when you specified schemaPattern it returns all the procedures no mather if the schema matches the pattern...