Statement: getGeneratedKeys import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql. Return generated keys: SQL Update « Database SQL JDBC « Java., Statement.RETURNGENERATEDKEYS). Related examples in the same category.
- Statement.return_generated_keys Example Free
- Statement.return_generated_keys Example Pdf
- Statement.return_generated_keys Example Sample
If you use the Statement.executeUpdate method to insert rows, invoke one of these forms of the Statement.executeUpdate method: Statement.executeUpdate( sql-statement, Statement.RETURNGENERATEDKEYS); Statement.executeUpdate( sql-statement, String columnNames ); Statement.executeUpdate( sql-statement, int columnIndexes ). If you include the Statement.RETURNGENERATEDKEYS parameter, the data type of the automatically generated keys in the ResultSet is DECIMAL, regardless of the data type of the corresponding column.
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7.4 Retrieving AUTO_INCREMENT
Column Values through JDBC
getGeneratedKeys()
is the preferred method to use if you need to retrieve AUTO_INCREMENT
keys and through JDBC; this is illustrated in the first example below. The second example shows how you can retrieve the same value using a standard SELECT LAST_INSERT_ID()
query. The final example shows how updatable result sets can retrieve the AUTO_INCREMENT
value when using the insertRow()
method.
Example 7.8 Connector/J: Retrieving
AUTO_INCREMENT
column values using Statement.getGeneratedKeys()
Example 7.9 Connector/J: Retrieving
AUTO_INCREMENT
column values using SELECT LAST_INSERT_ID()
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Statement.return_generated_keys Example Free
Example 7.10 Connector/J: Retrieving
AUTO_INCREMENT
column values in Updatable ResultSets
Running the preceding example code should produce the following output:
At times, it can be tricky to use the
-->
SELECT LAST_INSERT_ID()
query, as that function's value is scoped to a connection. So, if some other query happens on the same connection, the value is overwritten. On the other hand, the getGeneratedKeys()
method is scoped by the Statement
instance, so it can be used even if other queries happen on the same connection, but not on the same Statement
instance.
The Microsoft JDBC Driver for SQL Server supports the optional JDBC 3.0 APIs to retrieve automatically generated row identifiers. The main value of this feature is to provide a way to make IDENTITY values available to an application that is updating a database table without a requiring a query and a second round-trip to the server.
Because SQL Server doesn't support pseudo columns for identifiers, updates that have to use the auto-generated key feature must operate against a table that contains an IDENTITY column. SQL Server allows only a single IDENTITY column per table. The result set that is returned by getGeneratedKeys method of the SQLServerStatement class will have only one column, with the returned column name of GENERATED_KEYS. If generated keys are requested on a table that has no IDENTITY column, the JDBC driver will return a null result set.
As an example, create the following table in the sample database:
In the following example, an open connection to the sample database is passed in to the function, an SQL statement is constructed that will add data to the table, and then the statement is run and the IDENTITY column value is displayed.
Statement.return_generated_keys Example Pdf
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