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Thread: java + mysql update

  1. August 25th, 2011, 12:25 PM #1
    A4Andy
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    Default java + mysql update

    I am having trouble with my program regarding execute update statement

    this code is working
    val = st.executeUpdate("INSERT test VALUES("+3+","+"'Test1'"+","+"'Test2'"+");");

    but not this one
    int val = st.executeUpdate("insert test values ("+3+","+txtFName.getText()+","+txtLName.getText()+");");
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  3. August 25th, 2011, 12:57 PM #2
    copeg
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    Default Re: java + mysql update

    1) Sometimes when debugging things such as this, it helps to place the full query into a string and use a println statement to see what the query actually contains.
    2) you mention it one works and the other does not, define 'does not'...is there an exception thrown?
    3) What are txtFName and txtLName - what are their values?
    4) Recommend you use a PreparedStatement
    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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  4. August 25th, 2011, 01:19 PM #3
    A4Andy
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    Default Re: java + mysql update

    here is my action performed
    public void actionPerformed (ActionEvent event)
		{	
		//String dbtime;
                Connection con = null;
                String url = "jdbc:mysql://localhost:3306/";
                String db = "WaterStation";
                String driver = "com.mysql.jdbc.Driver";
                String FName = txtFName.getText();
                String LName = txtLName.getText();
                try{
                    Class.forName(driver);
                    con = DriverManager.getConnection(url+db,"root",[password]);
                    try{
                        Statement st = con.createStatement();
                        int val = st.executeUpdate("insert test values ("+3+","+txtFName.getText()+","+txtLName.getText()+");");
                       JOptionPane.showMessageDialog(null,txtFName.getText()+" "+txtLName.getText()+" is added");
                     }
                    catch (Exception sq){
                        JOptionPane.showMessageDialog(null, "SQL statement is not executed");
                    }
                }
                catch (Exception e){
                    e.printStackTrace();
                }
                } //end action performed
        }  //end class

    when I use .getText() the catch Eception sq occurs
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  5. August 25th, 2011, 02:04 PM #4
    copeg
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    Default Re: java + mysql update

    This does not directly address my points...what is the exception? Post the full stack trace.
    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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  6. The Following User Says Thank You to copeg For This Useful Post:

    A4Andy (August 26th, 2011)
  7. August 25th, 2011, 09:36 PM #5
    A4Andy
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    Default Re: java + mysql update

    I added sq.printStackTrace() in the catch sq

    here is my sq.printStackTrace()
    com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Unknown column 'first' in 'field list'
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
	at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1402)
	at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1317)
	at GUI$HandlerClass1.actionPerformed(GUI.java:115)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253)
	at java.awt.Component.processMouseEvent(Component.java:6203)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:5968)
	at java.awt.Container.processEvent(Container.java:2105)
	at java.awt.Component.dispatchEventImpl(Component.java:4564)
	at java.awt.Container.dispatchEventImpl(Container.java:2163)
	at java.awt.Component.dispatchEvent(Component.java:4390)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
	at java.awt.Container.dispatchEventImpl(Container.java:2149)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4390)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
	at java.awt.EventQueue$2.run(EventQueue.java:622)
	at java.awt.EventQueue$2.run(EventQueue.java:620)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

    the 'first' is the one that i wrote in JTextField txtFName
    Last edited by A4Andy; August 26th, 2011 at 05:11 AM.
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  8. August 26th, 2011, 12:26 PM #6
    copeg
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    Default Re: java + mysql update

    You have an error in your syntax. Please read my first post. To reiterate: using System.out.println before calling the query that works, and compare that to the query that doesn't work. You will see there are missing quotes - which would be readily avoided if you used a PreparedStatement as I suggested
    Code Tags | Java Tutorials | SSCCE | Getting Help | What Not To Do
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  9. August 26th, 2011, 09:04 PM #7
    A4Andy
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    Default Re: java + mysql update

    I switched to prepared statement and it is working fine now
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