jack zhai — Sat, 31 Jul 2010 08:09:00 GMT
package cc.apl330;

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

import cc.apl330.dao.UserDAOException;


//注意批处理在实际中应用要注意同时打包太多的处理会引�v内存溢出.
public class BatchTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		long start = System.currentTimeMillis() ;
		//常规方式提交处理
		for(int i=0; i<200; i++){
			create(i) ;
		}
		long end = System.currentTimeMillis() ;
		System.out.println("crate:" + (end - start)) ;
		
		//成批提交处理
		start = System.currentTimeMillis() ;
		create1() ;
		end = System.currentTimeMillis() ;
		System.out.println("Batchcrate:" + (end - start)) ;

	}
	
	//常规方式提交处理
	static void create(int i){
		String sql = "INSERT INTO USER(name,money) VALUES(?,?);";
		Connection conn;
		PreparedStatement ps;
		try {
			conn = JdbcUtil.getConnection();
			ps = conn.prepareStatement(sql) ;
			ps.setString(1, "name"+i) ;
			ps.setFloat(2, 200f+i) ;
			ps.executeUpdate();
			JdbcUtil.free(null, ps, conn) ;
		} catch (SQLException e) {
			throw new UserDAOException(e.getMessage(),e) ;
		}
	}
	
	//成批提交处理
	static void create1(){
		String sql = "INSERT INTO USER(name,money) VALUES(?,?);";
		Connection conn;
		PreparedStatement ps;
		try {
			conn = JdbcUtil.getConnection();
			ps = conn.prepareStatement(sql) ;
			for(int i=200; i<400; i++){
				ps.setString(1, "name"+i) ;
				ps.setFloat(2, 200f+i) ;
				ps.addBatch();//���处理打�?/span>
			}
			//执行批处�?/span>
			int[] is = ps.executeBatch() ;
			System.out.println(is.length+"") ;
			JdbcUtil.free(null, ps, conn) ;
		} catch (SQLException e) {
			throw new UserDAOException(e.getMessage(),e) ;
		}
	}
}
jack zhai 2010-07-31 16:09 发表评论
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