JDBC实现批处理方式有两种：statement() or preparedstatement()
一.使用preparedstatement()方法实现
package test; import java.io.InputStream; import java.sql.*; import java.util.Properties; import org.junit.Test; /** * JDBC操作 * */ public class JdbcTest { private static String url; private static String username; private static String password; static { try { InputStream is = PropTest.class.getResourceAsStream("/jdbc.properties"); Properties prop = new Properties(); prop.load(is); // 将驱动类加载到JVM中 String driver = prop.getProperty("jdbc.driver"); Class.forName(driver); url = prop.getProperty("jdbc.url"); username = prop.getProperty("jdbc.username"); password = prop.getProperty("jdbc.password"); } catch(Exception e) { e.printStackTrace(); } } public static void main(String[] args) throws Exception { Connection conn = DriverManager.getConnection(url, username, password); System.out.println(conn); } // ============= 单元测试 ============== @Test public void create() throws Exception { String sql = "create table tb_user (id int primary key auto_increment, name varchar(30), age int)"; Connection conn = DriverManager.getConnection(url, username, password); PreparedStatement pst = conn.prepareStatement(sql); pst.executeUpdate(); pst.close(); conn.close(); } @Test public void insert() throws Exception { String sql = "insert into tb_user values(null,?,?)"; Connection conn = DriverManager.getConnection(url, username, password); for(int i=0; i<10; i++) { PreparedStatement pst = conn.prepareStatement(sql); pst.setString(1, "test_" + i); pst.setInt(2, 20 + i); pst.executeUpdate(); pst.close(); } conn.close(); } @Test public void update() throws Exception { String sql = "update tb_user set name=? where id=?"; Connection conn = DriverManager.getConnection(url, username, password); PreparedStatement pst = conn.prepareStatement(sql); pst.setObject(1, "张三"); pst.setObject(2, 1); pst.executeUpdate(); pst.close(); conn.close(); } @Test public void delete() throws Exception { String sql = "delete from tb_user where age>=?"; Connection conn = DriverManager.getConnection(url, username, password); PreparedStatement pst = conn.prepareStatement(sql); pst.setObject(1, 28); pst.executeUpdate(); pst.close(); conn.close(); } @Test public void query1() throws Exception { String sql = "select * from tb_user where id=?"; Connection conn = DriverManager.getConnection(url, username, password); PreparedStatement pst = conn.prepareStatement(sql); pst.setObject(1, 1); ResultSet rs = pst.executeQuery(); if(rs.next()) { int id = rs.getInt("id"); String name = rs.getString("name"); int age = rs.getInt("age"); String msg = String.format("id=%d, name=%s, age=%d", id, name, age); System.out.println(msg); } pst.close(); conn.close(); } @Test public void query2() throws Exception { String sql = "select * from tb_user"; Connection conn = DriverManager.getConnection(url, username, password); PreparedStatement pst = conn.prepareStatement(sql); ResultSet rs = pst.executeQuery(); while(rs.next()) { int id = rs.getInt("id"); String name = rs.getString("name"); int age = rs.getInt("age"); String msg = String.format("id=%d, name=%s, age=%d", id, name, age); System.out.println(msg); } pst.close(); conn.close(); } /// ========== 批量操作 ============= @Test public void insert2() throws Exception { String sql = "insert into tb_user values(null,?,?)"; Connection conn = DriverManager.getConnection(url, username, password); long begin = System.currentTimeMillis(); for(int i=0; i<100000; i++) { PreparedStatement pst = conn.prepareStatement(sql); pst.setString(1, "test_" + i); pst.setInt(2, 20 + i); pst.executeUpdate(); pst.close(); } conn.close(); System.out.println(System.currentTimeMillis() - begin); } // executeBatch()没有效果 @Test public void insert3() throws Exception { String sql = "insert into tb_user values(null,?,?)"; Connection conn = DriverManager.getConnection(url, username, password); long begin = System.currentTimeMillis(); PreparedStatement pst = conn.prepareStatement(sql); for(int i=0; i<100000; i++) { pst.setString(1, "test_" + i); pst.setInt(2, 20 + i); pst.addBatch(); } pst.executeBatch(); pst.close(); conn.close(); System.out.println(System.currentTimeMillis() - begin); } // executeBatch()：必须保证事务不自动提交 @Test public void insert4() throws Exception { String sql = "insert into tb_user values(null,?,?)"; Connection conn = DriverManager.getConnection(url, username, password); conn.setAutoCommit(false); long begin = System.currentTimeMillis(); PreparedStatement pst = conn.prepareStatement(sql); for(int i=0; i<100000; i++) { pst.setString(1, "test_" + i); pst.setInt(2, 20 + i); pst.addBatch(); // 如果数据量比较大，需要分批次提交 if((i+1)%10000 == 0) { pst.executeBatch(); pst.clearBatch(); } } pst.executeBatch(); conn.setAutoCommit(true); pst.close(); conn.close(); System.out.println(System.currentTimeMillis() - begin); } }
来源：博客园
作者：绪花
链接：https://www.cnblogs.com/jjjjjjy/p/11516283.html