MySQL：check the manual that corresponds to your MySQL server version for the right syntax

冷不防 2022-08-05 14:20 81阅读 0赞

今天重新搞了一下JDBC，然后在写代码的时候遇到了一个蛋疼的问题，纠结了很久，抛出的异常如下：

  1. 数据库连接成功！conn=com.mysql.jdbc.JDBC4Connection@4acdd9ba
  2. com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?,?)' at line 1
  3.     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  4.     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
  5.     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  6.     at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
  7.     at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
  8.     at com.mysql.jdbc.Util.getInstance(Util.java:386)
  9.     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
  10.     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
  11.     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
  12.     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
  13.     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
  14.     at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2819)
  15.     at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1811)
  16.     at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1725)
  17.     at org.phn.dao.test.DBUtil.main(DBUtil.java:98)
  18. **Error**:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?,?)' at line 1

就是这一句

  1. com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?,?)' at line 1

下面是我的代码

  1. package org.phn.dao.test;
  3. import java.sql.Connection;
  4. import java.sql.DriverManager;
  5. import java.sql.PreparedStatement;
  6. import java.sql.ResultSet;
  7. import java.sql.SQLException;
  8. import java.util.ResourceBundle;
  10. /**
  11.  * @author phn
  12.  * @date 2015-4-8
  13.  * @TODO 数据库操作工具类
  14.  */
  15. public class DBUtil {
  16.     static ResourceBundle rbundle = ResourceBundle.getBundle("db");
  17.     private static String driverName = rbundle.getString("className");
  18.     private static String dbUser = rbundle.getString("user");
  19.     private static String dbPass = rbundle.getString("password");
  20.     private static String dbUrl = rbundle.getString("url");
  22.     /**
  23.      * @date 2015-4-8
  24.      * @TODO 获取数据库连接
  25.      * @return Connection
  26.      */
  27.     public static Connection getConnection() {
  28.         try {
  29.             // 这里使用这种方法已经指定了new出来的Driver是mysql的驱动
  30.             // DriverManager.registerDriver(new Driver());
  31.             Class.forName(driverName).newInstance();
  32.             Connection conn = null;
  33.             conn = DriverManager.getConnection(dbUrl, dbUser, dbPass);
  34.             if (conn != null) {
  35.                 System.out.println("数据库连接成功！conn=" + conn);
  36.                 return conn;
  37.             }
  38.         } catch (InstantiationException e) {
  39.             // e.printStackTrace();
  40.             System.out.println("**Error**:caused at " + DBUtil.class + "."
  41.                     + new Throwable().getStackTrace()[0].getMethodName() + "::"
  42.                     + e.getMessage());
  43.         } catch (IllegalAccessException e) {
  44.             // e.printStackTrace();
  45.             System.out.println("**Error**:caused at " + DBUtil.class + "."
  46.                     + new Throwable().getStackTrace()[0].getMethodName() + "::"
  47.                     + e.getMessage());
  48.         } catch (ClassNotFoundException e) {
  49.             // e.printStackTrace();
  50.             System.out.println("**Error**:caused at " + DBUtil.class + "."
  51.                     + new Throwable().getStackTrace()[0].getMethodName() + "::"
  52.                     + e.getMessage());
  53.         } catch (SQLException e) {
  54.             // e.printStackTrace();
  55.             System.out.println("**Error**:caused at " + DBUtil.class + "."
  56.                     + new Throwable().getStackTrace()[0].getMethodName() + "::"
  57.                     + e.getMessage());
  58.         }
  59.         System.out.println("**Error**:数据库连接失败！");
  60.         return null;
  61.     }
  65.     public static void main(String[] args) {
  66.         try {
  67.             Connection conn = getConnection();
  68.             String insertSql = "INSERT INTO t_user(uname,upass) VALUES(?,?)";
  69.             if (conn != null) {
  70.                 PreparedStatement pstm = conn.prepareStatement(insertSql);
  71.                 pstm.setString(1, "234");
  72.                 pstm.setString(2, "234");
  73.                 pstm.executeUpdate(insertSql);
  74.             }
  75.         } catch (SQLException e) {
  76.             e.printStackTrace();
  77.             System.out.println("**Error**:" + e.getMessage());
  78.         }
  80.     }
  81. }

网上找了很多，然后终于在一位仁兄的博客中遇到了类似的问题，下面是这个问题的解决办法：

仔细看看我的main方法中的这一段：

  1. PreparedStatement pstm = conn.prepareStatement(insertSql);
  2. pstm.setString(1, "234");
  3. pstm.setString(2, "234");
  4. pstm.executeUpdate(insertSql);

PrepareStatement 的方法 executeUpdate 经过了重载，即有一个带String sql参数的和一个没有带String sql参数的，这里就是由于我使用了带Sql语句参数的方法才导致出现这个问题的。

实际上使用executeUpdate（）的话sql语句中可以使用？作为参数传递。若使用executeUpdate（string sql）的话则不能使用sql语句中带?参数。

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