Java Prepared Statement Get Generated Keys
- Prepared Statement In Java Example
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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). 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. The following code creates a table with an identity column, inserts a row into the table, and retrieves the automatically generated key value for the identity column. Java - Is there a way to retrieve the autoincrement ID from a prepared statement - Stack Overflow Is there a way to retrieve the auto generated key from a DB query when using a java query with prepared statements. For example, I know AutoGeneratedKeys can work as follows.
I have the following method in my DB connection class:
In my main class I run the following query:
How do I get the ID of the above query?
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Lookup 'auto generated keys' in the java documentation.
Start with interfaces 'java.sql.Connection' and 'java.sql.Statement'.
Good Luck,
Avi.
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I am still pretty new to this and don't fully understand what is going on. I tried reading up on it to no avail. Is it possible if someone could break this code down for me?
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[ September 22, 2008: Message edited by: shaf maff ]
Preparedstatements are like Statements (e.g. like cursors) that are pre-compiled and more efficient than statements. http://java.sun.com/j2se/1.5.0/docs/api/java/sql/Statement.html#getGeneratedKeys();
Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys.
You can loop through the keys and retrive them one by one. In this case you only inserted one row so you are getting it out as show below.
If you have many rows inserted then you can do something like
Also have a look at this http://exampledepot.com/egs/java.sql/GetRsData.html
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Performing a SELECT statement to read keys is not often recommended in a multi-threaded environment since there's a chance (depending on your transactional/lock levels) you could get the wrong key. JDBC's getGeneratedKeys() command is a good option but it is not always supported by all databases. I tend to prefer generating keys yourself since it gives you complete database independence (not all databases generate keys in the same way, see Oracle), and gives you control to make decisions in your application before ever contacting the database.
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Originally posted by shaf maff:
This line worries me alot. You should *ALWAYS* check the return value of keys.next() since you may have unexpected behavior. While the common situation is to use a while loop, such as 'while(keys.next()) { .. }', if you expect a single record return (such as a 'SELECT count(*) FROM') you can use 'if(keys.next()) { .. }'. But you should never ignore the conditional!
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Scott: I have a try/catch statement. Shouldnt that suffice?
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and then I use it like this..
Parent ID prints blank!!!? Thank you..
It may be that this feature does not work with prepared statements ?
I was going to say to try to use the alternate signature for executeUpdate:int executeUpdate(String sql,
int autoGeneratedKeys)
throws SQLException
the jdbc API docs say :
autoGeneratedKeys - a flag indicating whether auto-generated keys should be made available for retrieval; one of the following constants: Statement.RETURN_GENERATED_KEYS Statement.NO_GENERATED_KEYS
it could be your JDBC driver implementation uis by default not making the generated keys available when the executeUpdate() is called.
but that you need to pass it a query string, which defeats the good of using prepared statements.
hmmm..
would it be possible to have a mthod that invokes a sequence, or generates the keys, then you would pass that value into your insert statement:
hmm, the getGeneratedKeys() is new in java 1.4; it could be your JDBC driver does not really implement this completely or properly yet.
It may be that this feature does not work with prepared statements ?
I was going to say to try to use the alternate signature for executeUpdate:
int executeUpdate(String sql,
int autoGeneratedKeys)
throws SQLException
the jdbc API docs say :
Prepared Statement In Java Example
autoGeneratedKeys - a flag indicating whether auto-generated keys should be made available for retrieval; one of the following constants: Statement.RETURN_GENERATED_KEYS Statement.NO_GENERATED_KEYS
it could be your JDBC driver implementation uis by default not making the generated keys available when the executeUpdate() is called.
but that you need to pass it a query string, which defeats the good of using prepared statements.
Java Prepared Statement Get Generated Keys Lyrics
hmmm..would it be possible to have a mthod that invokes a sequence, or generates the keys, then you would pass that value into your insert statement:
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Generating keys and using those values is a non-trivial matter. One solution (most common) is to always query for the max row after you create a record. If done as part of a transaction there are ways to make this somewhat safe.
Another solution I prefer is to not use database generated keys but generate the keys yourself. This probably has the best success since you never have to worry about someone else getting your key.. if your insert fails (assuming the column is a key and/or unique) the transaction will roll back. Of course, there are ways of preventing that by using a static key generator.
Java Prepared Statement Get Generated Keys Without
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