Question

 import java.util.Scanner;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.Statement;
      public class H {

              public static void main(String[] args) throws Exception {

                  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                   Connection conn = DriverManager.getConnection("jdbc:odbc:dsn1","system","mandriva");
                   Statement stmt = conn.createStatement();
                   Scanner sc = new Scanner(System.in);

                String fName, lName, sql, input;
                 int id, age;

               do {

                  System.out.println("Enter ID");
                  id = sc.nextInt();
                  System.out.println("Enter First Name");
                  fName = sc.next();
                  System.out.println("Enter Last Name");
                  lName = sc.next();
                  System.out.println("Enter Age");
                  age = sc.nextInt();

                  sql = "insert into employee values(" + id + "," +  fName + "," +  lName + "," +  age + ")";
                 stmt.execute(sql);

              System.out.println("Do you want to insert one more(y/n)?");
              input = sc.next();
            } while("y".equals(input));

         System.out.println("done");
     }
 }

当我运行此程序时，在输入信息后，它会显示以下错误：

线程中的异常＆＃34; main＆＃34; java.sql.SQLException：[Oracle] [ODBC] [Ora] ORA-00984：这里不允许列 at sun.jdbc.odbc.JdbcOdbc.createSQLException（Unknown Source） at sun.jdbc.odbc.JdbcOdbc.standardError（Unknown Source） at sun.jdbc.odbc.JdbcOdbc.SQLExecDirect（Unknown Source） at sun.jdbc.odbc.JdbcOdbcStatement.execute（Unknown Source）在SQL1.H.main（H.java:30）

有人可以解释为什么会发生此异常吗？

Answer 1

使用Prepare stmt而不是传递内联参数。还在insert语句中提供列名：

// Assuming columns are: id, first_name, last_name, age
sql = "insert into employee(id, first_name, last_name, age) values(?, ?, ?, ?)";

PreparedStatement pstmt = conn.prepareStatement(sql);

pstmt.setInt(1, id);
pstmt.setString(2, fName);
pstmt.setString(3, lName);
pstmt.setInt(4, age);

pstmt.executeUpdate();

Answer 2

对于插入（对于所有DML），您必须使用executeUpdate()方法。

Answer 3

您忘记了varchar列的单引号。像这样使用它

sql = "insert into employee values(" + id + ",'" +  fName + "','" +  lName + "'," +  age + ")";

错误“不允许列”使用JDBC执行查询

3 个答案: