The com.ibm.db2.jcc.DB2ResultSetMetaData interface
provides methods that provide information about a ResultSet object.
Before a com.ibm.db2.jcc.DB2ResultSetMetaData method
can be used, a java.sql.ResultSetMetaData object
that is returned from a java.sql.ResultSet.getMetaData call
needs to be cast to com.ibm.db2.jcc.DB2ResultSetMetaData.
DB2ResultSetMetaData methods:
The following
methods are defined only for the IBM® Data Server Driver for JDBC and SQLJ.
- getDB2OptimisticLockingColumns
- Format:
public int getDB2OptimisticLockingColumns()
throws java.sql.SQLException
Returns a value that
indicates whether optimistic locking columns are available. Possible
values are:
- 0
- Optimistic locking columns are not available.
- 1
- Optimistic locking columns are available, but the change token
might not have the granularity to prevent false negatives.
- 2
- Optimistic locking columns are available, and the change token
has the granularity to prevent false negatives.
- getDBTemporalColumnType
- Format:
public int getDBTemporalColumnType (int column)
throws java.sql.SQLException
Returns:
- -1
- If column is not a ROW BEGIN, ROW END or TRANSACTION
START ID column.
- 1
- If column is a ROW BEGIN column.
- 2
- If column is a ROW END column.
- 3
- If column is a TRANSACTION START ID column.
Parameter descriptions:
- column
- The ordinal position of a column in the ResultSet.
- getMaxStringUnitBits
- Format:
public int getMaxStringUnitBits (int column)
throws java.sql.SQLException
Returns the maximum number
of bits in a string unit for single-byte and double-byte character
data types. The value that is returned is:
- 8
- For a character column that is defined with OCTETS.
- 16
- For a character column that is defined with CODEUNITS16.
- 32
- For a character column that is defined with CODEUNITS32.
Parameter descriptions:
- column
- The ordinal position of a column in the ResultSet.
This method applies only to connections to DB2® for Linux, UNIX, and Windows Version
10.5 or later data servers.
- isDB2ColumnNameDerived
- Format:
public boolean isDB2ColumnNameDerived (int column)
throws java.sql.SQLException
Returns true if the name of a ResultSet column
is in the SQL SELECT list that generated the ResultSet.
For
example, suppose that a ResultSet is generated
from the SQL statement SELECT EMPNAME, SUM(SALARY) FROM EMP. Column
name EMPNAME is derived from the SQL SELECT list, but the name of
the column in the ResultSet that corresponds to
SUM(SALARY) is not derived from the SELECT list.
Parameter descriptions:
- column
- The ordinal position of a column in the ResultSet.
DB2 10.5 for Linux, UNIX, and Windows