Java 使用 Jconnect

Question

再会！

为了访问 mysql 服务器，我使用了 JConnect，我的代码如下：

  public AddBooks() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/catalog";
            conn = DriverManager.getConnection(url,"root","upittc");
            stmt = conn.prepareStatement("INSERT INTO books VALUES(?,?,?,?,?,?,?,?,?,?,)");

        } catch (Exception exc) {
            JOptionPane.showMessageDialog(null, exc.getMessage());
        }
        initComponents();
    }

为了将数据放入数据库，我使用了以下代码：

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
      try {
              stmt.setString(1, jTextField0.getText()); 
              stmt.setString(2, jTextField1.getText());
              stmt.setString(3, jTextField2.getText());
              stmt.setString(4, jTextField3.getText());
              stmt.setString(5, jTextField4.getText());
              stmt.setString(6, Jan2.getSelectedItem().toString());
              stmt.setString(7, Jan3.getSelectedItem().toString());
              stmt.setString(8, jTextField5.getText());
              stmt.setString(9, jTextField6.getText());
              stmt.setString(10, jTextField8.getText());
              stmt.executeUpdate();
              JOptionPane.showMessageDialog(null, "Save Successful!");

      } catch (Exception ex) {
              JOptionPane.showMessageDialog(null, ex);
      }
}

But There's an error on row 1. COLUMN COUNT DOESN'T MATCH THE VALUE AT ROW 是什么意思？ 请指教。谢谢。

Answer 1

如果该字段是自动递增的，则不应为其分配任何内容，将其从 SQL 准备好的语句字符串中删除，然后设置其他所有内容，自动递增将自行完成工作。

PreparedStatement stmt = connect.prepareStatement("INSERT INTO table_name (column1, column2, column3,...) VALUES (value1, value2, value3,...) ");

删除第一列 to have:

PreparedStatement stmt = connect.prepareStatement("INSERT INTO table_name (column2, column3,...) VALUES ( value2, value3,...) ");

并将值替换为问号，然后按照稍后的操作进行设置。

          stmt.setString(1, jTextField1.getText());
          stmt.setString(2, jTextField2.getText());
          stmt.setString(3, jTextField3.getText());
          stmt.setString(4, jTextField4.getText());
          stmt.setString(5, Jan2.getSelectedItem().toString());
          stmt.setString(6, Jan3.getSelectedItem().toString());
          stmt.setString(7, jTextField5.getText());
          stmt.setString(8, jTextField6.getText());
          stmt.setString(9, jTextField8.getText());
          stmt.executeUpdate();

注意：递减的索引（问号值的数量）。

希望有帮助！