jdbc基础 (四) 批处理

  1 package com.cream.ice.jdbc;
  2 
  3 import java.sql.Connection;
  4 import java.sql.PreparedStatement;
  5 import java.sql.ResultSet;
  6 import java.sql.Statement;
  7 
  8 import org.junit.Test;
  9 
 10 /**
 11  * 
 12  * 假设已经存在表test： 
 13  * create table test( 
 14  *         id int primary key,
 15  *         name varchar(20) 
 16  * );
 17  * 
 18  * @author ice
 19  *
 20  */
 21 
 22 public class Batch {
 23     private Connection connection;
 24     private Statement statement;
 25     private PreparedStatement preStatement;
 26     private ResultSet resultSet;
 27 
 28     /**
 29      * 向ttest中插入2条记录，删除掉第1条
 30      * 由于批处理的多条语句不同，所以使用Statement进行批处理
 31      */
 32     @Test
 33     public void testBatch1() {
 34         try {
 35             connection = JdbcUtils.getConnection();
 36             statement = connection.createStatement();
 37 
 38             String sql1 = "insert into test (id,name) values(1,'Tom')";
 39             String sql2 = "insert into test (id,name) values(2,'Jack')";
 40             String sql3 = "delete from test where id=1";
 41 
 42             // 内部维护了一个List，将sql语句加到List中
 43             statement.addBatch(sql1);
 44             statement.addBatch(sql2);
 45             statement.addBatch(sql3);
 46 
 47             // 执行批处理
 48             int num[] = statement.executeBatch();
 49 
 50             // i为每条语句影响到的行数
 51             for (int i : num)
 52                 System.out.print(i + " ");
 53 
 54         } catch (Exception e) {
 55             e.printStackTrace();
 56         } finally {
 57             JdbcUtils.releaseResources(null, statement, connection);
 58         }
 59     }
 60 
 61     /**
 62      * 向test中插入100条记录
 63      * 由于语句完全相同，只是参数不同，使用PreparedStatement
 64      */
 65     @Test
 66     public void testBatch2() {
 67         try {
 68             connection = JdbcUtils.getConnection();
 69 
 70             String sql = "insert into test (id,name) values(?,?)";
 71 
 72             preStatement = connection.prepareStatement(sql);
 73 
 74             // 要插入100条记录
 75             for (int i = 0; i < 100; i++) {
 76                 preStatement.setInt(1, i + 1);
 77                 preStatement.setString(2, "No." + (i + 1));
 78                 preStatement.addBatch();
 79             }
 80 
 81             // 执行批处理语句
 82             preStatement.executeBatch();
 83             
 84             statement=connection.createStatement();
 85             resultSet=statement.executeQuery("select * from test");
 86             
 87             //将插入记录打印到控制台上
 88             while(resultSet.next()){
 89                 System.out.print("id:"+resultSet.getInt("id")+" ");
 90                 System.out.println("name:"+resultSet.getString("name"));
 91             }
 92             
 93         } catch (Exception e) {
 94             e.printStackTrace();
 95         } finally {
 96             JdbcUtils.releaseResources(null, preStatement, connection);
 97             JdbcUtils.releaseResources(resultSet, statement, connection);
 98         }
 99     }
100 }