spring使用c3p0数据源

1.导入jar包（c3p0）

 

 

 

2.在spring配置文件中配置数据源和JdbcTemplate的bean

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

3.在单元测试测试

package com.zhiyou100.kfs.test;   import java.util.ArrayList; import java.util.List;   import org.junit.jupiter.api.AfterAll; import org.junit.jupiter.api.BeforeAll; import org.junit.jupiter.api.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper;   import com.zhiyou100.kfs.bean.User;   class TestJdbcTemplate {          private static JdbcTemplate jdbcTemplate;        @BeforeAll        static void setUpBeforeClass() throws Exception {               jdbcTemplate =(JdbcTemplate)new ClassPathXmlApplicationContext("applicationContext.xml").getBean("jdbcTemplate");        }          @AfterAll        static void tearDownAfterClass() throws Exception {        }          /**         *   增删改         */        @Test        void testUpdate() {               String sql="insert into tb_user (uusername) value('张八');";               jdbcTemplate.update(sql);        }        /**         *   多条添加         */        @Test        void testBatchUpdate() {               String sql1="insert into tb_user (uusername) value(?);";               String sql2="insert into tb_user (uusername) value('张十');";               List list=new ArrayList<>();               String[] uusername1=new String[] {new String("张九2")};               String[] uusername2=new String[] {new String("张九3")};               jdbcTemplate.batchUpdate(sql1, list);        }        /**         *   查询一条记录         */        @Test        void testQueryOne() {               String sql="select * from tb_user where u_id=?;";               RowMapper rowMapper=new BeanPropertyRowMapper<>(User.class);               User user=jdbcTemplate.queryForObject(sql, rowMapper,1);               System.out.println(user);        }        /**         *   查询多条记录         */        @Test        void testQueryList() {               String sql="select * from tb_user;";               RowMapper rowMapper=new BeanPropertyRowMapper<>(User.class);               List list=jdbcTemplate.query(sql, rowMapper);               System.out.println(list);        }        /**         *   查询单值（有多少条记录）         */        @Test        void testQuerySingtonColumn() {               String sql="select count(u_id) c from tb_user;";               int a=jdbcTemplate.queryForObject(sql, Integer.class);               System.out.println(a);        } }

转载于:https://www.cnblogs.com/kfsrex/p/11494629.html