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Scrollable and Updateable Cursors in JDBC
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Just as scrollable cursors have been added to the ANSI/ISO SQL standards, scrollable cursors have been added to JDBC result sets in later versions of the specification. You indicate that you want a query to produce results that are scrollable through a parameter to the executeQuery method. If you specify scrollability, the ResultSet returned by the executeQuery call offers some additional methods for cursor control. The important methods are listed in Table 19-21.
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Method getMessage() getSQLState() getErrorCode() getNextException()
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TABLE 19-20
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Description Retrieves error message describing the exception Retrieves SQLSTATE value (5-char string, as described in 17) Retrieves driver-specific or DBMS-specific error code Moves to next SQL exception in a series
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Function Scrollable cursor motion previous() beforeFirst() first() last() afterLast() absolute() relative() Cursor position sensing isFirst() isLast() isBeforeFirst() isAfterLast() moveToInsertRow() moveToCurrentRow() updateInt() updateShort() updateLong() updateFloat() updateDouble() updateString() updateBoolean() updateDate() updateTime() updateTimestamp() updateByte() updateBytes() updateBigDecimal() updateNull() updateObject()
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Description Moves cursor to previous row of query results Moves cursor before the start of the results Moves cursor to first row of query results Moves cursor to last row of query results Moves cursor past end of the results Moves cursor to absolute row number indicated Moves cursor to relative row number indicated Determines whether the current row is the first row of the result set Determines whether the current row is the last row of the result set Determines whether the cursor is positioned before the beginning of the result set Determines whether the cursor is positioned past the end of the result set Moves cursor to empty row for inserting new data Moves cursor back to the current row before an insertion Updates an integer column value Updates a short integer column value Updates a long integer column value Updates a floating point column value Updates a double-precision floating point column value Updates a string column value Updates a true/false column value Updates a date column value Updates a time column value Updates a timestamp column value Updates a byte column value Updates a fixed-length or variable-length column value Updates a DECIMAL or NUMERIC column value Updates a column to a NULL value Updates an arbitrary column value
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Update a column of current row (via cursor)
PART V
TABLE 19-21 JDBC ResultSet Object Extended Cursor Methods
Part V:
Programming with SQL
Function getTables() getColumns() getPrimaryKeys() getProcedures() getProcedureColumns()
Description Returns result set of table information of tables in database Returns result set of column names and type info, given table name Returns result set of primary key info, given table name Returns result set of stored procedure info Returns result set of info about parameters for a specific stored procedure
TABLE 19-22 DatabaseMetaData Methods for Database Information Retrieval
In addition to scrollable result sets, later versions of the JDBC specification added support for updateable result sets. This capability corresponds to the UPDATE WHERE CURRENT OF capability in embedded SQL. It allows an update to specific columns of this row, which is indicated by the current position of a cursor. Updateable result sets also allow new rows of data to be inserted into a table via a result set.
Retrieving Metadata with JDBC
The JDBC interface provides objects and methods for retrieving metadata about databases, query results, and parameterized statements. A JDBC Connection object provides access to metadata about the database that it represents. Invoking its getMetaData() method returns a DatabaseMetaData object, described in Table 19-22. Each method listed in the table returns a result set containing information about a type of database entity: tables, columns, primary keys, and so on. The result set can be processed using the normal JDBC query results processing routines. Other metadata access methods provide information about the database product name supported on this connection, its version number, and similar information. Metadata information about query results can also be very useful. A ResultSet object provides a getMetaData method that can be invoked to obtain a description of its query results. The method returns a ResultSetMetaData object, described in Table 19-23. The methods let you determine how many columns are in the query results, and the name and data type of each column, identified by their ordinal position within the query results.
Function getColumnCount() getColumnName() getColumnType()
TABLE 19-23
Description Returns number of query results columns Retrieves name of specified results column Retrieves data type of specified results column
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