[英]My code in Swift vs. Java. Swift gives an error but Java doesn't. Are there any differences?
[英]i want to write to code to update mysql data in Java. Here is my code. and it gives error like this:
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
DefaultTableModel d1 = (DefaultTableModel)jTable2.getModel();
int selectIndex = jTable2.getSelectedRow();
int id = Integer.parseInt(d1.getValueAt(selectIndex, 0).toString());
String bname = txtname.getText();
CategoryItem citem = (CategoryItem) txtcategory.getSelectedItem();
AuthorItem aitem = (AuthorItem) txtauthor.getSelectedItem();
PublisherItem pitem = (PublisherItem) txtpub.getSelectedItem();
String contents = txtcontent.getText();
String pages = txtno.getText();
String edition = txtedition.getText();
try {
pst = con.prepareStatement("update book set bname= ? , category= ? , author= ? , publisher= ? , contents= ? , pages= ? , edition= ? , where id= ? ");
pst.setString(1, bname);
pst.setInt(2, citem.id);
pst.setInt(3, aitem.id);
pst.setInt(4, pitem.id);
pst.setString(5, contents);
pst.setString(6, pages);
pst.setString(7, edition);
pst.setInt(8,id);
int k=pst.executeUpdate();
if(k==1)
{
JOptionPane.showMessageDialog(this,"Book Added");
txtname.setText("");
txtcategory.setSelectedIndex(-1);
txtauthor.setSelectedIndex(-1);
txtpub.setSelectedIndex(-1);
txtcontent.setText("");
txtno.setText("");
txtedition.setText("");
}
else
{
JOptionPane.showMessageDialog(this,"Error");
}
// TODO add your handling code here:
} catch (SQLException ex) {
Logger.getLogger(Book.class.getName()).log(Level.SEVERE, null, ex);
}
}
// and it gives error like this
//com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check //the manual that corresponds to your MariaDB server version for the right syntax to use near 'where id= //1' at line 1
此錯誤的可能原因是您編寫了錯誤的查詢。 請看下面:
pst = con.prepareStatement("update book set bname= ? , category= ? , author= ? , publisher= ? , contents= ? , pages= ? , edition= ? , where id= ? ");
版本=? , 在哪里
在 where 之前刪除
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