java 操作本地数据库 mysql
2017-12-09 11:33
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单线程版 /** * */ import java.sql.*; import java.util.Date; import org.omg.CORBA.PUBLIC_MEMBER; /** * @author Administrator * */ public class Mysql { public void Chaxun() { try { Class.forName("com.mysql.jdbc.Driver"); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } String url="jdbc:mysql://localhost:3306/beijing";//jabc的路径 Connection connection; try { connection=DriverManager.getConnection(url, "root", "liwanlei"); Statement statement=connection.createStatement(); String sql="select * from student where id=1"; ResultSet resultSet=statement.executeQuery(sql); if (resultSet.next()) { System.out.println(resultSet.getString("name")); } statement.close(); connection.close(); } catch (Exception e) { // TODO: handle exception System.out.println(e); } } public void Change() { try { Class.forName("com.mysql.jdbc.Driver"); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); System.out.println("异常"); } String url="jdbc:mysql://localhost:3306/beijing";//jabc的路径 Connection connection; try { connection=DriverManager.getConnection(url, "root", "liwanlei"); Statement statement=connection.createStatement(); String sql="UPDATE student SET name=? WHERE id=?"; PreparedStatement preparedStatement=connection.prepareStatement(sql); preparedStatement.setString(1, "liwanlei"); preparedStatement.setInt(2, 1); preparedStatement.executeUpdate(); System.out.println("ok");} catch (Exception e) { // TODO: handle exception System.out.println("异常"); } } public void Adddate() { Date aDate=new Date(); try { Class.forName("com.mysql.jdbc.Driver"); } catch (Exception e) { // TODO: handle exception System.out.println("加载驱动失败"); } String url="jdbc:mysql://localhost:3306/beijing"; Connection connection; try { connection=DriverManager.getConnection(url, "root", "liwanlei"); Statement statement=connection.createStatement(); String sql="insert into student (id,name,age,address) values (?,?,?,?)"; PreparedStatement preparedStatement=connection.prepareStatement(sql); for(int i=1;i<10;i++){ preparedStatement.setInt(1, i); preparedStatement.setString(2, "liwanddlei"+i); preparedStatement.setInt(3, i*333); preparedStatement.setString(4, "beijiddng"+i); preparedStatement.executeUpdate(); } preparedStatement.close(); connection.close(); Date date=new Date(); System.out.println((date.getTime()-aDate.getTime())); System.out.println("插入慕成功"); } catch (Exception e) { // TODO: handle exception } } public static void main(String[] args) { // TODO Auto-generated method stub Mysql mysql=new Mysql(); mysql.Adddate(); } }
多线程插入版本 import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.Statement; import java.util.Date; /** * */ /** * @author lileilei *Threadmyql.java *2017年12月9日 */ public class Threadmyql extends Thread{ @Override public void run() { Date aDate=new Date(); try { Class.forName("com.mysql.jdbc.Driver"); } catch (Exception e) { // TODO: handle exception System.out.println("加载驱动失败"); } String url="jdbc:mysql://localhost:3306/beijing"; Connection connection; try { connection=DriverManager.getConnection(url, "root", "liwanlei"); Statement statement=connection.createStatement(); String sql="insert into student (id,name,age,address) values (?,?,?,?)"; PreparedStatement preparedStatement=connection.prepareStatement(sql); for(int i=1;i<100000;i++){ preparedStatement.setInt(1, i); preparedStatement.setString(2, "asdasdasd"+i); preparedStatement.setInt(3, i*333); preparedStatement.setString(4, "asdasdasdasdasdasd"+i); preparedStatement.executeUpdate(); } preparedStatement.close(); connection.close(); Date date=new Date(); System.out.println((date.getTime()-aDate.getTime())/1000); System.out.println("插入慕成功"); } catch (Exception e) { // TODO: handle exception } } public static void main(String[] args) { for (int i = 1; i <=10; i++) { new Threadmyql().start(); } } }
数据关联性小,没有必要做性能,做了一会 发现没有必要
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