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JDBCTemplate：spring提供的用于操作数据库的模板，类似DbUtils。使用时必须设置数据源（DataSource）；数据源如DBCP、C3P0等
一、JDBCAPI简单使用Demo
1、项目结构
2、创建MySQL数据库及表
create database springJDBCPro; use springJDBCPro; create table user( id int primary key auto_increment, username varchar(50), password varchar(32) );
3、Java代码demo
package springJDBCPro; import java.sql.SQLException; import org.apache.commons.dbcp.BasicDataSource; import org.junit.Test; import org.springframework.jdbc.core.JdbcTemplate; public class TestApp { @Test public void demo1() throws SQLException { //创建数据源 BasicDataSource basicDataSource=new BasicDataSource(); //注册驱动 basicDataSource.setDriverClassName("com.mysql.jdbc.Driver"); //设置URL basicDataSource.setUrl("jdbc:mysql://localhost:3306/springJDBCPro"); //设置登录用户名 basicDataSource.setUsername("root"); //设置登录密码 basicDataSource.setPassword("hjp123"); // 创建模板 JdbcTemplate jdbcTemplate = new JdbcTemplate(); //设置数据源 jdbcTemplate.setDataSource(basicDataSource); //录入数据 jdbcTemplate.update("insert into user(username,password) values(?,?)","Jack","Jac123"); } }
二、JDBC结合DBCP，通过spring操作数据库
1、项目结构
2、UserDao类代码
package springJDBCDBCP; import org.springframework.jdbc.core.JdbcTemplate; public class UserDao { private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } public void save(String username, String password) { jdbcTemplate.update("insert into user(username,password) values(?,?)",username,password); } }
3、beans.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" 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"> <!-- 配置数据源 --> <bean id="dataSourceId" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/springJDBCPro"></property> <property name="username" value="root"></property> <property name="password" value="hjp123"></property> </bean> <!-- 配置模板，需要数据源 --> <bean id="jdbcTemplateId" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSourceId"></property> </bean> <!-- 配置Dao，需要模板 --> <bean id="userDaoId" class="springJDBCDBCP.UserDao"> <property name="jdbcTemplate" ref="jdbcTemplateId"></property> </bean> </beans>
4、测试Demo
package springJDBCDBCP; import java.sql.SQLException; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestApp { @Test public void demo1() throws SQLException { String xmlPath="springJDBCDBCP/beans.xml"; ApplicationContext applicationContext=new ClassPathXmlApplicationContext(xmlPath); UserDao userDao=applicationContext.getBean("userDaoId",UserDao.class); userDao.save("Tom", "Tom123"); } }
三、JDBC结合C3P0，通过spring操作数据库（下面用的是IDEA开发工具）
1、项目结构
2、在WEB-INF文件夹下新增lib文件夹，然后添加到项目Library，在lib里面添加项目结构图中的jar包
3、新建User类
package springJDBCC3P0; /** * Created by JiaPeng on 2015/10/13. */ public class User { private Integer id; private String userName; private String password; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "User{" + "id=" + id + ", userName=‘" + userName + ‘\‘‘ + ", password=‘" + password + ‘\‘‘ + ‘}‘; } }
4、新建UserDao类，并且继承自JdbcDaoSupport，该类中会判断JDBCTemplate模板对象是否为空，为空自动创建，创建完后模板会自动添加数据源对象，所以在后面配置文件中添加UserDao的bean时，只注入数据源即可，而UserDao类中也无需有JDBCTemplate模板的可写对象。
package springJDBCC3P0; import org.springframework.jdbc.core.simple.ParameterizedBeanPropertyRowMapper; import org.springframework.jdbc.core.support.JdbcDaoSupport; /** * Created by JiaPeng on 2015/10/13. */ public class UserDao extends JdbcDaoSupport { public void save(String userName, String password) { this.getJdbcTemplate().update("insert into user(username,password) values(?,?)", userName, password); } public User find(int id) { String sql = "select * from user where id=?"; return this.getJdbcTemplate().queryForObject(sql, ParameterizedBeanPropertyRowMapper.newInstance(User.class), id); } }
5、新建配置文件beans.xml，配置如下
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" 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"> <!--配置数据源 C3P0--> <bean id="datasourceId" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springJDBCPro"></property> <property name="user" value="root"></property> <property name="password" value="hjp123"></property> </bean> <!--配置Dao，Dao继承JdbcDaoSupport类，该类会判断jdbctemplate模板是否为空，如果为空该类会创建模板对象， 并且调用setDataSource方法，加载数据源--> <bean id="userDaoId" class="springJDBCC3P0.UserDao"> <property name="dataSource" ref="datasourceId"></property> </bean> </beans>
6、新建测试类
package springJDBCC3P0; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Created by JiaPeng on 2015/10/13. */ public class TestApp { @Test public void demo1() { String xmlPath = "springJDBCC3P0/beans.xml"; ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath); UserDao userDao = applicationContext.getBean("userDaoId", UserDao.class); User user = userDao.find(1); System.out.println(user); } }
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原文地址：http://www.cnblogs.com/hujiapeng/p/4826995.html
