Java Get Generated Keys Prepared Statement Mysql

• Mysql Prepared Statement Insert
• Java Get Generated Keys Prepared Statement Mysql In Windows 7

It's a little confusing, you actually need to go check your javadocs for the connection interface to see how it all works:). Nfs undercover key generator download. There's a prepareStatement method that takes the Statement.RETURNGENERATEDKEYS flag, and then you just use the normal PreparedStatement.executeUpdate method, followed by a Statement.getGeneratedKeys.

Posted by: Alex Cheung
Date: November 04, 2004 11:39AM

[java] java.lang.NullPointerException
[java] at com.mysql.jdbc.Statement.getGeneratedKeys(Statement.java:308)
--- details below ---
MySql version: 4.0.21-nt
MySql JConnector Driver version: 3.0.15-ga
table:
create table dp_objtype
(
objtypeid int not null auto_increment,
objname varchar(64) not null,
objclass varchar(255) null,
PRIMARY KEY (objtypeid)
) type = innoDB;
statement:
PreparedStatement pstmt = conn.preparedStatement('insert into dp_objtype (objname, objclass) values (?,?)', Statement.RETURN_GENERATED_KEYS);
If I use pstmt.execute(), the insert-stmt executed without any problem. If I use pstmt.getGeneratedKeys(), I get the following Exception:
[java] psqlstmt = insert into dp_objtype (objname, objclass) values (?,?)
[java] set val[1] = user
[java] set val[2] = com.datapipes.db.User
[java] java.lang.NullPointerException
[java] at com.mysql.jdbc.Statement.getGeneratedKeys(Statement.java:308)
[java] at com.mysql.jdbc.PreparedStatement.getGeneratedKeys(PreparedSta
tement.java:538)
[java] at com.ace.db.DbHelper.insertObject(DbHelper.java:351)
If someone can tell me how to correct this, or if there is a fix for it somewhere.
thanks
-alex

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Re: preparedStatement.getGeneratedKeys() exception.

November 04, 2004 01:26PM

Re: preparedStatement.getGeneratedKeys() exception.

November 04, 2004 04:07PM

Re: preparedStatement.getGeneratedKeys() exception.

November 04, 2004 08:19PM

Mysql Prepared Statement Insert

Re: preparedStatement.getGeneratedKeys() exception.

November 05, 2004 01:07AM

Re: preparedStatement.getGeneratedKeys() exception.

Java Get Generated Keys Prepared Statement Mysql In Windows 7

November 05, 2004 09:39AM

Re: preparedStatement.getGeneratedKeys() exception.

November 05, 2004 11:13AM

Re: preparedStatement.getGeneratedKeys() exception.

November 05, 2004 03:57PM

Re: preparedStatement.getGeneratedKeys() exception.

November 06, 2004 02:19AM

Re: preparedStatement.getGeneratedKeys() exception.

January 03, 2005 09:54PM

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The PreparedStatement interface is a subinterface of Statement. It is used to execute parameterized query.

Let's see the example of parameterized query:

String sql='insert into emp values(?,?,?)';

As you can see, we are passing parameter (?) for the values. Its value will be set by calling the setter methods of PreparedStatement.

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Why use PreparedStatement?

Improves performance: The performance of the application will be faster if you use PreparedStatement interface because query is compiled only once.

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How to get the instance of PreparedStatement?

The prepareStatement() method of Connection interface is used to return the object of PreparedStatement. Syntax:

public PreparedStatement prepareStatement(String query)throws SQLException{}

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:

create table emp(id number(10),name varchar2(50));

Now insert records in this table by the code given below:

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import java.sql.*;class InsertPrepared{public static void main(String args[]){try{Class.forName('oracle.jdbc.driver.OracleDriver');Connection con=DriverManager.getConnection('jdbc:oracle:thin:@localhost:1521:xe','system','oracle');PreparedStatement stmt=con.prepareStatement('insert into Emp values(?,?)');stmt.setInt(1,101);//1 specifies the first parameter in the querystmt.setString(2,'Ratan');int i=stmt.executeUpdate();System.out.println(i+' records inserted');con.close();}catch(Exception e){ System.out.println(e);}}}

Example of PreparedStatement interface that updates the record

PreparedStatement stmt=con.prepareStatement('update emp set name=? where id=?');stmt.setString(1,'Sonoo');//1 specifies the first parameter in the query i.e. namestmt.setInt(2,101);int i=stmt.executeUpdate();System.out.println(i+' records updated');

Example of PreparedStatement interface that deletes the record

PreparedStatement stmt=con.prepareStatement('delete from emp where id=?');stmt.setInt(1,101);int i=stmt.executeUpdate();System.out.println(i+' records deleted');

Example of PreparedStatement interface that retrieve the records of a table

PreparedStatement stmt=con.prepareStatement('select * from emp');ResultSet rs=stmt.executeQuery();while(rs.next()){System.out.println(rs.getInt(1)+' '+rs.getString(2));}

Example of PreparedStatement to insert records until user press n

import java.sql.*;import java.io.*;class RS{public static void main(String args[])throws Exception{Class.forName('oracle.jdbc.driver.OracleDriver');Connection con=DriverManager.getConnection('jdbc:oracle:thin:@localhost:1521:xe','system','oracle');PreparedStatement ps=con.prepareStatement('insert into emp130 values(?,?,?)');BufferedReader br=new BufferedReader(new InputStreamReader(System.in));do{System.out.println('enter id:');int id=Integer.parseInt(br.readLine());System.out.println('enter name:');String name=br.readLine();System.out.println('enter salary:');float salary=Float.parseFloat(br.readLine());ps.setInt(1,id);ps.setString(2,name);ps.setFloat(3,salary);int i=ps.executeUpdate();System.out.println(i+' records affected');System.out.println('Do you want to continue: y/n');String s=br.readLine();if(s.startsWith('n')){break;}}while(true);con.close();}}