JDBC进阶

PreparedStatement的使用：

conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?"
                    + "user=root&password=root");
            pstmt = conn.prepareStatement("insert into dept values (?,?,?)");
            pstmt.setInt(1,deptno);
            pstmt.setString(2,dname);
            pstmt.setString(3,loc);
            pstmt.executeUpdate();

transaction:

单词本身是交易的意思

在数据库中，保证语句要么同时执行成功，要么同时执行失败，典型例子银行转账

 import java.sql.*;
 public class TestJDBC {

     public static void main(String[] args)  {
         Connection conn = null;
         Statement stmt = null;
         try {
             Class.forName("oracle.jdbc.OracleDriver");
             conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","tigger");
             conn.setAutoCommit(false);
             stmt = conn.createStatement();
             stmt.addBatch("insert into example values(12,'Game','BeiJing')");
             stmt.addBatch("insert into example values(13,'Game','BeiJing')");
             stmt.addBatch("insert into example values(14,'Game','BeiJing')");
             stmt.executeBatch();
             conn.commit();
             conn.setAutoCommit(true);
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         } catch (SQLException e) {
             e.printStackTrace();
             if(conn != null) {
                 try {
                     conn.rollback();//一旦出错，要重新设置成自动执行
                     conn.setAutoCommit(true);
                 } catch (SQLException e1) {
                     e1.printStackTrace();
                 }
             }
         }
         try {
             stmt.close();
             conn.close();
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }

 }