JDBC的批处理操作三种方式 pstmt.addBatch();

JDBC的批处理操作三种方式

 

 

SQL批处理是JDBC性能优化的重要武器，经本人研究总结，批处理的用法有三种。

 

package lavasoft.jdbctest;

import lavasoft.common.DBToolkit;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;

/**
* JDBC的批量操作三种方式
*/
public class BatchExeSQLTest {

        public static void main(String[] args) {
                exeBatchStaticSQL();
        }

        /**
         * 批量执行预定义模式的SQL
         */
        public static void exeBatchParparedSQL() {
                Connection conn = null;
                try {
                        conn = DBToolkit.getConnection();
                        String sql = "insert into testdb.book (kind, name) values (?,?)";
                        PreparedStatement pstmt = conn.prepareStatement(sql);
                        pstmt.setString(1, "java");
                        pstmt.setString(2, "jjjj");
                        pstmt.addBatch();                     //添加一次预定义参数
                        pstmt.setString(1, "ccc");
                        pstmt.setString(2, "dddd");
                        pstmt.addBatch();                     //再添加一次预定义参数
                        //批量执行预定义SQL
                        pstmt.executeBatch();
                } catch (SQLException e) {
                        e.printStackTrace();
                } finally {
                        DBToolkit.closeConnection(conn);
                }
        }

        /**
         * 批量执行混合模式的SQL、有预定义的，还有静态的
         */
        public static void exeBatchMixedSQL() {
                Connection conn = null;
                try {
                        conn = DBToolkit.getConnection();
                        String sql = "insert into testdb.book (kind, name) values (?,?)";
                        PreparedStatement pstmt = conn.prepareStatement(sql);
                        pstmt.setString(1, "java");
                        pstmt.setString(2, "jjjj");
                        pstmt.addBatch();    //添加一次预定义参数
                        pstmt.setString(1, "ccc");
                        pstmt.setString(2, "dddd");
                        pstmt.addBatch();    //再添加一次预定义参数
                        //添加一次静态SQL
                        pstmt.addBatch("update testdb.book set kind = 'JAVA' where kind='java'");
                        //批量执行预定义SQL
                        pstmt.executeBatch();
                } catch (SQLException e) {
                        e.printStackTrace();
                } finally {
                        DBToolkit.closeConnection(conn);
                }
        }

        /**
         * 执行批量静态的SQL
         */
        public static void exeBatchStaticSQL() {
                Connection conn = null;
                try {
                        conn = DBToolkit.getConnection();
                        Statement stmt = conn.createStatement();
                        //连续添加多条静态SQL
                        stmt.addBatch("insert into testdb.book (kind, name) values ('java', 'java in aciton')");
                        stmt.addBatch("insert into testdb.book (kind, name) values ('c', 'c in aciton')");
                        stmt.addBatch("delete from testdb.book where kind ='C#'");
                        stmt.addBatch("update testdb.book set kind = 'JAVA' where kind='java'");
//                        stmt.addBatch("select count(*) from testdb.book");                //批量执行不支持Select语句
                        //执行批量执行
                        stmt.executeBatch();
                } catch (SQLException e) {
                        e.printStackTrace();
                } finally {
                        DBToolkit.closeConnection(conn);
                }
        }
}

 

注意：JDBC的批处理不能加入select语句，否则会抛异常：

java.sql.BatchUpdateException: Can not issue SELECT via executeUpdate().
  at com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:1007)

 

转载自:http://lavasoft.blog.51cto.com/62575/238651