spring框架学习笔记6:JDBC模板
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2022-04-08 16:49:41
JDBC模板:Spring中对数据库的操作。 这一部分对熟悉DBUtils的QueryRunner的开发者来说,非常简单 这是以前我简单写的dbutils的知识: http://www.cnblogs.com/xuyiqing/p/8397428.html 导包: 1.spring中的包 2.c3p ......
JDBC模板:Spring中对数据库的操作。
这一部分对熟悉DBUtils的QueryRunner的开发者来说,非常简单
这是以前我简单写的dbutils的知识:
http://www.cnblogs.com/xuyiqing/p/8397428.html
导包:
1.spring中的包
2.c3p0连接池包
3.数据库驱动包
最终导入这些包:
2.准备数据库测试:
简单的测试:
@Test public void fun1() throws Exception{ //准备连接池 ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setDriverClass("com.mysql.jdbc.Driver"); dataSource.setJdbcUrl("jdbc:mysql:///mybase"); dataSource.setUser("root"); dataSource.setPassword("xuyiqing"); //1 创建JDBC模板对象 JdbcTemplate jt = new JdbcTemplate(); jt.setDataSource(dataSource); //2 书写sql,并执行 String sql = "insert into t_user values(null,'Tom') "; jt.update(sql); }
接下来使用Spring框架管理对象:
创建实体类:
package bean; public class User { private Integer id; private String name; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "User [id=" + id + ", name=" + name + "]"; } }
数据库操作功能:
package jdbctemplate; import java.util.List; import bean.User; public interface UserDao { //增 void save(User u); //删 void delete(Integer id); //改 void update(User u); //查 User getById(Integer id); //查 int getTotalCount(); //查 List<User> getAll(); }
package jdbctemplate; import java.sql.ResultSet; import java.sql.SQLException; import java.util.List; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.core.support.JdbcDaoSupport; import bean.User; //使用JDBC模板实现增删改查 public class UserDaoImpl extends JdbcDaoSupport implements UserDao { @Override public void save(User u) { String sql = "insert into t_user values(null,?) "; super.getJdbcTemplate().update(sql, u.getName()); } @Override public void delete(Integer id) { String sql = "delete from t_user where id = ? "; super.getJdbcTemplate().update(sql,id); } @Override public void update(User u) { String sql = "update t_user set name = ? where id=? "; super.getJdbcTemplate().update(sql, u.getName(),u.getId()); } @Override public User getById(Integer id) { String sql = "select * from t_user where id = ? "; return super.getJdbcTemplate().queryForObject(sql,new RowMapper<User>(){ @Override public User mapRow(ResultSet rs, int arg1) throws SQLException { User u = new User(); u.setId(rs.getInt("id")); u.setName(rs.getString("name")); return u; }}, id); } @Override public int getTotalCount() { String sql = "select count(*) from t_user "; Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class); return count; } @Override public List<User> getAll() { String sql = "select * from t_user "; List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>(){ @Override public User mapRow(ResultSet rs, int arg1) throws SQLException { User u = new User(); u.setId(rs.getInt("id")); u.setName(rs.getString("name")); return u; }}); return list; } }
现在就完成了数据库操作,接下来配置到Spring来管理对象
注意配置文件:
先写一个键值对配置文件:db.properties
jdbc.jdbcUrl=jdbc:mysql:///mybase jdbc.driverClass=com.mysql.jdbc.Driver jdbc.user=root jdbc.password=xuyiqing
xml配置文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd "> <!-- 指定spring读取db.properties配置 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 1.将连接池放入spring容器 --> <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" > <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property> <property name="driverClass" value="${jdbc.driverClass}" ></property> <property name="user" value="${jdbc.user}" ></property> <property name="password" value="${jdbc.password}" ></property> </bean> <!-- 2.将UserDao放入spring容器 --> <bean name="userDao" class="jdbctemplate.UserDaoImpl" > <property name="dataSource" ref="dataSource" ></property> </bean> </beans>
测试:
package jdbctemplate; import java.beans.PropertyVetoException; import javax.annotation.Resource; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.mchange.v2.c3p0.ComboPooledDataSource; import bean.User; //演示JDBC模板 @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class Demo { @Resource(name="userDao") private UserDao ud; @Test public void fun2() throws Exception{ User u = new User(); u.setName("tom"); ud.save(u); } @Test public void fun3() throws Exception{ User u = new User(); u.setId(2); u.setName("jack"); ud.update(u); } @Test public void fun4() throws Exception{ ud.delete(2); } @Test public void fun5() throws Exception{ System.out.println(ud.getTotalCount()); } @Test public void fun6() throws Exception{ System.out.println(ud.getById(1)); } @Test public void fun7() throws Exception{ System.out.println(ud.getAll()); } }