Statement.return_generated_keys Example

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7.4 Retrieving AUTO_INCREMENT Column Values through JDBC

Statement: getGeneratedKeys import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql. Java PreparedStatement interface with examples on Driver, DriverManager, Connection, Statement, ResultSet, PreparedStatement, CallableStatement, ResultSetMetaData.

What Is Statement.return_generated_keys

Statement: getGeneratedKeys import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql. For example, in a table if we have a column with name ID and data type INT, which is auto-incremented and, if we already have 6 records in that table. When you insert the next record using the INSERT statement the ID value of the new record will be 7 and the ID value of its next record will be 8. For example, if the statement triggered the creation of 3 records, with indexes 1,2,3, the getGeneratedKeys method would return a result set with 3 records, each containing the value '1'. For version 1.1.1/1.1.2.

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()

Statement.return_generated_keys Example Paper


Statement.return_generated_keys Example Letter

Example 7.9 Connector/J: Retrieving AUTO_INCREMENT column values using SELECT LAST_INSERT_ID()


Statement.return_generated_keys Meaning

Example 7.10 Connector/J: Retrieving AUTO_INCREMENT column values in Updatable ResultSets


Prepared Statement.return_generated_keys Example

Running the preceding example code should produce the following output:

Statement.return_generated_keys Example Sample

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.