2022-4-28作业

1 分别使用DBCP和C3P0连接池，对数据库的一张表进行增删改查操作，并测试事务，如果发生异常事务回滚（截图展示结果）

先创建一个数据库

#创建数据库
CREATE DATABASE db6 CHARACTER SET utf8;
#使用数据库
USE db6;
#创建员工表
CREATE TABLE emp ( eid INT PRIMARY KEY AUTO_INCREMENT , ename VARCHAR (20), -- 员工姓名 age INT , -- 员工年龄 sex VARCHAR (6), -- 员工性别 salary DOUBLE , -- 薪水 empdate DATE -- 入职日期
);#插入数据
INSERT INTO emp (eid, ename, age, sex, salary, empdate) VALUES(NULL,'张三',22,'女',4000,'2018-11-12');
INSERT INTO emp (eid, ename, age, sex, salary, empdate) VALUES(NULL,'李四',20,'女',5000,'2019-03-14');
INSERT INTO emp (eid, ename, age, sex, salary, empdate) VALUES(NULL,'王二',40,'男',6000,'2020-01-01');
INSERT INTO emp (eid, ename, age, sex, salary, empdate) VALUES(NULL,'麻子',25,'男',3000,'2017-10-01');

DBCP

public class zy01 {public static final String DRIVER_NAME = "com.mysql.jdbc.Driver";public static final String URl = "jdbc:mysql://localhost:3306/db6";public static final String USERNAME = "root";public static final String PASSWORD = "12343456";public static BasicDataSource dataSource = new BasicDataSource();static {dataSource.setDriverClassName(DRIVER_NAME);dataSource.setUrl(URl);dataSource.setUsername(USERNAME);dataSource.setPassword(PASSWORD);}public static Connection getConnection() throws SQLException {Connection conn = dataSource.getConnection();return conn;}//提供事务回滚的方法public static void rollback(Connection conn){try {conn.rollback();} catch (SQLException e) {e.printStackTrace();}}public static void close(Connection conn, Statement st){if (conn != null && st != null){try {st.close();conn.close();} catch (SQLException e) {e.printStackTrace();}}}public static void close(Connection conn, Statement st, ResultSet rs){if (conn != null && st != null && rs != null){try {rs.close();st.close();conn.close();} catch (SQLException e) {e.printStackTrace();}}}}

public class zy01Test {public static void main(String[] args)  {Connection conn = null;PreparedStatement ps = null;ResultSet rs = null;try {conn = zy01.getConnection();ps = conn.prepareStatement("select * from emp");rs = ps.executeQuery();while (rs.next()) {String name = rs.getString("ename");String age = rs.getString("age");String salary = rs.getString("salary");System.out.println("姓名：" + name + ",年龄：" + age + ",薪资" + salary);}}catch (Exception e){e.printStackTrace();zy01.rollback(conn);}finally {DBCPUtils.close(conn,ps,rs);}}}

增

@Testpublic void testInsert() throws Exception {//1.工具类获取链接Connection conn = zy01.getConnection();//2.获取 StatementStatement statement = conn.createStatement();//2.1编写sqlString sql = "insert into emp values (null,'哈哈','11','女','1000','2022-4-28')";//2.2 执行sqlint i = statement.executeUpdate(sql);//3.释放资源zy01.close(conn,statement);}

删

@Testpublic void testDelete() throws SQLException {Connection conn = zy01.getConnection();Statement statement = conn.createStatement();String sql = "delete from emp where eid = 2 ";statement.executeUpdate(sql);zy01.close(conn,statement);}

改

@Testpublic void testUpDate() throws SQLException {Connection conn = zy01.getConnection();Statement statement = conn.createStatement();String sql ="update emp set ename ='嘿嘿' where eid =3 ";int i =statement.executeUpdate(sql);System.out.println(i);zy01.close(conn,statement);}

查

@Testpublic void testSelect() throws SQLException {Connection conn = zy01.getConnection();Statement statement = conn.createStatement();String sql = "select * from emp where eid in (1,3,5)";ResultSet rs= statement.executeQuery(sql);//解析结果集while (rs.next()){String eid = rs.getString("eid");String ename = rs.getString("ename");String age = rs.getString("age");String sex = rs.getString("sex");System.out.println("eid:" + eid +",ename:" +ename +",age:" + age +",sex:" + sex);}zy01.close(conn,statement,rs);}

C3P0

我重新建了表employeezy如下，操作一样就不展示了

public class zy02 {public static ComboPooledDataSource dataSource = new ComboPooledDataSource("mysql");public static Connection getConnection() throws SQLException {return dataSource.getConnection();}public static void rollback(Connection conn){try {conn.rollback();} catch (SQLException e) {e.printStackTrace();}}public static void close(Connection conn, Statement st){if (conn != null && st != null){try {st.close();conn.close();} catch (SQLException e) {e.printStackTrace();}}}public static void close(Connection conn, Statement st, ResultSet rs){if (conn != null && st != null && rs != null){try {rs.close();st.close();conn.close();} catch (SQLException e) {e.printStackTrace();}}}}

输出工资在4000-5000的名字

public class zy02Test {public static void main(String[] args) {Connection conn = null;PreparedStatement ps = null;ResultSet rs = null;try{conn = zy02.getConnection();ps = conn.prepareStatement("select * from employeezy where salary between ? and ?");ps.setInt(1,4000);ps.setInt(2,5000);//执行sqlrs = ps.executeQuery();//获取结果集while (rs.next()){System.out.println(rs.getString("ename"));}}catch (Exception e){e.printStackTrace();zy02.rollback(conn);}finally {zy02.close(conn,ps,rs);}}}

结果：

增：

@Testpublic void testInsert() throws Exception {Connection conn = zy02.getConnection();Statement statement = conn.createStatement();String sql = "insert into employeezy values (null,'呵呵','11','女','7000','2022-4-28')";int i = statement.executeUpdate(sql);zy02.close(conn,statement);}

删：

 @Testpublic void testDelete() throws SQLException {Connection conn = zy02.getConnection();Statement statement = conn.createStatement();String sql = "delete from employeezy where eid = 3 ";statement.executeUpdate(sql);zy02.close(conn,statement);}

改：

@Testpublic void testUpDate() throws SQLException {Connection conn = zy02.getConnection();Statement statement = conn.createStatement();String sql ="update employeezy set ename ='扣扣大有' where eid =4 ";int i =statement.executeUpdate(sql);System.out.println(i);zy02.close(conn,statement);}

查：

 @Testpublic void testSelect() throws SQLException {Connection conn = zy02.getConnection();Statement statement = conn.createStatement();String sql = "select * from employeezy where eid in (2,4)";ResultSet rs= statement.executeQuery(sql);//解析结果集while (rs.next()){String eid = rs.getString("eid");String ename = rs.getString("ename");String age = rs.getString("age");String sex = rs.getString("sex");System.out.println("eid:" + eid +",ename:" +ename +",age:" + age +",sex:" + sex);}zy02.close(conn,statement,rs);}

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