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6.4 Retrieving AUTO_INCREMENT
Column Values through JDBC
- Mysql Insert Statement Return Generated Keys Download
- Mysql Insert Statement Return Generated Keys In Java
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Before version 3.0 of the JDBC API, there was no standard way of retrieving key values from databases that supported auto increment or identity columns. With older JDBC drivers for MySQL, you could always use a MySQL-specific method on the
Statement
interface, or issue the query SELECT LAST_INSERT_ID()
after issuing an INSERT
to a table that had an AUTO_INCREMENT
key. Using the MySQL-specific method call isn't portable, and issuing a SELECT
to get the AUTO_INCREMENT
key's value requires another round-trip to the database, which isn't as efficient as possible. The following code snippets demonstrate the three different ways to retrieve AUTO_INCREMENT
values. First, we demonstrate the use of the new JDBC 3.0 method getGeneratedKeys()
which is now the preferred method to use if you need to retrieve AUTO_INCREMENT
keys and have access to JDBC 3.0. 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 6.8 Connector/J: Retrieving
AUTO_INCREMENT
column values using Statement.getGeneratedKeys()
Mar 16, 2004 Re: Problem with Statement.RETURNGENERATEDKEYS JustinCave Mar 16, 2004 4:13 PM ( in response to ra.416892.us ) I have a table called trigdemo that has two columns, col1 and col2. Col1 is populated by a BEFORE INSERT trigger. Description: When I insert with a PreparedStatement or Statement and I read the generated key by the mysql database, I have a SQLException Generated keys not requested, but I have specified the Statement.RETURNGENERATEDKEYS parameter. I have tested with connector/J 5.1.23 and 5.1.30 and Fedora Linux 64 bits and Windows Server 2012 64 bits. SELECT and INSERT. ON DUPLICATE KEY UPDATE, see Section 13.2.5.1, “INSERT. SELECT Statement”, and Section 13.2.5.2, “INSERT. ON DUPLICATE KEY UPDATE Statement”. In MySQL 5.7, the DELAYED keyword is accepted but ignored by the server. Feb 22, 2016 This post provides code example that gets the value of the newly inserted record in database using JDBC. Some database operations, especially those involving parent-child relationships (one-to-many), you may want to insert a record into the parent table first, then into the child table.
Example 6.9 Connector/J: Retrieving
AUTO_INCREMENT
column values using SELECT LAST_INSERT_ID()
- Then, you construct an INSERT statement with placeholders and create a new PreparedStatement object by calling the prepareStatement method of the Connection object. You pass the INSERT statement as the first argument and an integer with value Statement.RETURNGENERATEDKEYS as the the second argument to the method.
- To get the generated key from a MySQL database table, just use the MySQL LASTINSERTID function, calling it as shown below, immediately after performing your INSERT command (and very importantly, also using the same connection): SELECT LASTINSERTID; Here's a blurb from this MySQL page. LASTINSERTID (with no argument) returns the first automatically generated value that was set for an AUTOINCREMENT column by the most recently executed INSERT statement to affect such a column.
Example 6.10 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. - Related Questions & Answers
- Selected Reading
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.
In MySQL database you can declare a column auto increment using the following syntax.
While inserting records in a table there is no need to insert value under the auto-incremented column. These will be generated automatically.
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. Windows 7 starter license key generator. 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.
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(You can specify the initial value and interval for these auto-incremented columns). Openssl generate ecc public key.
Retrieving the auto-incremented values
Mysql Insert Statement Return Generated Keys Download
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.
Example
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 −
Mysql Insert Statement Return Generated Keys In Java
- Set values of each record to the bind variables using the setXXX() methods and, add it to batch.
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After adding values of all the records to the batch, execute the batch using the executeBatch() method.
Mysql Insert Statement Return Generated Keys In Excel
- 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. Sims 3 supernatural product key generator for microsoft office 2016.