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The PreparedStatement interface is a subinterface of Statement. It is used to execute parameterized query.
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This array contains the names of the columns in the target table that contain the auto-generated keys that should be made available. The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific). This is fixed for 3.0.13, but only for prepared statements (it is a little outside the scope of the JDBC spec, as there is no corrolary executeBatch method in java.sql.Statement that specifies that generated keys should be returned). Sorry for the stress of the names! RETURNGENERATEDKEYS is not the unique way to request the autogenerated keys, Connection.prepareStatement(String sql, String columnNames) is another way as JAVA API states: 'Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. An SQL Statement is put into a PreparedStatement and is precompiled so that it can be executed efficiently multiple times. Wps office license key generator. Setter methods are supplied in the PreparedStatement interface for the setting of IN parameters for the statement. The setter method used for each IN parameter must match the parameter's type.
Let's see the example of parameterized query:
As you can see, we are passing parameter (?) for the values. Its value will be set by calling the setter methods of PreparedStatement.
Why use PreparedStatement?
Improves performance: The performance of the application will be faster if you use PreparedStatement interface because query is compiled only once.
How to get the instance of PreparedStatement?
The prepareStatement() method of Connection interface is used to return the object of PreparedStatement. Syntax:
Methods of PreparedStatement interface
The important methods of PreparedStatement interface are given below:
| Method | Description |
|---|---|
| public void setInt(int paramIndex, int value) | sets the integer value to the given parameter index. |
| public void setString(int paramIndex, String value) | sets the String value to the given parameter index. |
| public void setFloat(int paramIndex, float value) | sets the float value to the given parameter index. |
| public void setDouble(int paramIndex, double value) | sets the double value to the given parameter index. |
| public int executeUpdate() | executes the query. It is used for create, drop, insert, update, delete etc. |
| public ResultSet executeQuery() | executes the select query. It returns an instance of ResultSet. |
Example of PreparedStatement interface that inserts the record
First of all create table as given below:
Now insert records in this table by the code given below: