Java JDBC批处理

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

public class JDBCBatDemo {

private GetConn getConn;

private Connection conn;

private PreparedStatement stmt ;

private ResultSet rs = null;

public JDBCBatDemo(){
getConn = new GetConn();
}
/**
* @param args
*/
public static void main(String[] args) {

JDBCBatDemo demo = new JDBCBatDemo();
// long start = System.currentTimeMillis();//开始的时间
// demo.creatBatInsert();
// long end = System.currentTimeMillis();//结束的时间
// System.out.println("批处理插入的时间是:"+(end - start));
long start = System.currentTimeMillis();//开始的时间
demo.delBat();
long end = System.currentTimeMillis();//结束的时间
System.out.println("批处理删除的时间是:"+(end - start));
}

/**
* 批处理添加数据
*/
public void creatBatInsert(){
conn = getConn.getConnection();
String sql = "insert into test values(?,?,?)";
try {
stmt = conn.prepareStatement(sql);
for (int i = 0; i < 1000; i++) {
stmt.setString(1,"name"+i);
stmt.setDate(2, new Date(System.currentTimeMillis()));
stmt.setInt(3, 1000);
//放到包里去
stmt.addBatch();
}
int[] arr = stmt.executeBatch();//执行批处理
System.out.println(arr);
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]);
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
GetConn.free(stmt, conn, rs);
}
}

/**
* 批处理删除记录
*/
public void delBat(){
conn = getConn.getConnection();
String sql = "delete from test";
try {
stmt = conn.prepareStatement(sql);
stmt.addBatch();
stmt.executeBatch();
} catch (SQLException e) {
e.printStackTrace();
}finally{
GetConn.free(stmt, conn, rs);
}
}

}

public static void main(String[] args) ...{
    Class.forName("sqldriver");
    Connection conn = DriverManager.getConnection(URL,USER,PASS)

    //无参，添加案例
    Statement stmt = conn.createStatement();
    stmt.addBatch("insert into authors(firstName，lastName) values('fegor','hack')");
    stmt.addBatch("insert into authors(firstName，lastName) values('fegors','hacks')");
    stmt.addBatch("insert into authors(firstName，lastName) values('fegorsr','hacksr')");
    stmt.executeBatch();
    stmt.close();
    conn.close();

    //带参,添加案例
    PreparedStatement ps=conn.prepareStatement("insert into authors(firstName，lastName) values(?,?)");

    ps.setString(1,"nihao1");//设置参数
    ps.setString(2,"wohao1");
    ps.addBatch();           //把语句加入批处理队列

    ps.setString(1,"nihao2");
    ps.setString(2,"wohao2");
    ps.addBatch();

    ps.setString(1,"nihao3");
    ps.setString(2,"wohao3");
    ps.addBatch();

    ps.executeBatch();        //执行批处理

    ps.close();               //最后关闭
    conn.close();
}
//总结:
//1.stmt=conn.createStatement()这个后面的括号里面一般没有东西！！！
//2.pstmt=conn.prepareStament("insert into authors(firstName,lastName) values(?,?)")
//这个后面一定有sql语句，并且里面的参数是用？表示的。
//然后用pstmt.setString(1,"fegor")来设定它的值,1表示第1个问号的位置，"fegor"，表示我们要加的值
//最后用pstmt.executeUpdate()去执行。

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