Prepared Statement Get Generated Keys

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Prepared Statement Get Generated Keys Without

JDBCObject Oriented ProgrammingProgramming

While creating a table, in certain scenarios, we need values to column such as ID, to be generated/incremented automatically. Various databases support this feature in different ways.

I am facing problem to use prepared statement with auto increment primary key. How should we insert values in such table? How to use PreparedStatement with AutoIncrement (JDBC and Relational Databases forum at Coderanch). IN parameter placeholders autoGeneratedKeys - a flag indicating whether auto-generated keys should be returned; one of Statement.RETURNGENERATEDKEYS or Statement.NOGENERATEDKEYS Returns: a new PreparedStatement object, containing the pre-compiled SQL statement, that will have the capability of returning auto-generated keys Throws.

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In MySQL database you can declare a column auto increment using the following syntax.

Jan 03, 2005  PRIMARY KEY (objtypeid) ) type = innoDB; statement: PreparedStatement pstmt = conn.preparedStatement('insert into dpobjtype (objname, objclass) values (?,?)', Statement.RETURNGENERATEDKEYS); If I use pstmt.execute, the insert-stmt executed without any problem. If I use pstmt.getGeneratedKeys, I get the following Exception. 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? Jun 16, 2011  Re: 1.8 prepared statement with autoGeneratedKeys I'm not able to get CALL IDENTITY to work with I've got a small test application that just has a main that simply creates a JDBC connection, does an insert and then does a CALL IDENTITY. How to Retrieve Automatically Generated Keys in JDBC? You can retrieve automatically generated keys (also called auto-generated keys or auto increment) from a table using JDBC 3.0 methods getGeneratedKeys.The getGeneratedKeys provide a standard way to make auto-generated or identity column values available to an application that is updating a database. When we are inserting a record into the database table and the primary key is an auto-increment or auto-generated key, then the insert query will generate it dynamically. The below example shows how to get this key after insert statement. After perfoming executeUpdate method on PreparedStatement, call getGeneratedKeys method on PreparedStatement.

Prepared Statement Get Generated Keys In Florida

While inserting records in a table there is no need to insert value under the auto-incremented column. These will be generated automatically.

Prepared Statement Get Generated Keys Free

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.

(You can specify the initial value and interval for these auto-incremented columns).

Retrieving the auto-incremented values

If you insert records into a table which contains auto-incremented column, using a PreparedStatement object.

You can retrieve the values of that particular column, generated by the current PreparedStatement object using the getGeneratedKeys() method.


Let us create a table with name sales in MySQL database, with one of the columns as auto-incremented, using CREATE statement as shown below −

Now, to insert records into this table using PreparedStatement object and, to retrieve the auto-incremented values generated by it −

  • Register the Driver class of the desired database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.
  • Create a Connection object by passing the URL of the database, user-name and password of a user in the database (in string format) as parameters to the getConnection() method of the DriverManager class.
  • Create a PreparedStatement object using the prepareStatement() method of the connection interface.

To this method pass the INSERT statement with bind variables in string format as one parameter and, Statement.RETURN_GENERATED_KEYS as other parameter as −

  • Set values of each record to the bind variables using the setXXX() methods and, add it to batch.

After adding values of all the records to the batch, execute the batch using the executeBatch() method.

  • Finally, get the auto-incremented keys generated by this PreparedStatement object using the getGeneratedKeys() method.

Following JDBC program inserts 5 records into the Sales table (created above) using PreparedStatement, retrieves and displays the auto-incremented values generated by it.



Ranch Hand
posted 6 years ago
Hello Everyone
I am facing problem to use prepared statement with auto increment primary key. How should we insert values in such table ? Say i have 2 columns where 'id' is int type, primary key, not null & auto increment. How should i enter the values in the name column which is of varchar type ?
Thanks !!!

Prepared Statement.return_generated_keys Example

posted 6 years ago
If the 'id' is primary key and auto-increment, why do you need to specify it in your code? If you do specify the id then it's not really auto-increment.