1. Spring JDBC 模板
Spring 是EE的一站式开发框架，对持久层同样提供了支持：ORM模块和JDBC模板
Spring 提供了很多模板简化了开发
- spring中提供了一个可以操作数据库的对象，对象封装了jdbc技术。
- 与DBUtils中QueryRunner非常相似
2. JDBC模板的使用
基本使用方法
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创建数据库
mysql> show create table account; | Table | Create Table| account | CREATE TABLE `account` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` char(10) DEFAULT NULL, `money` double DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 -
public class JDBCTemplateTest { @Test public void testadd(){ // 创建连接池 DriverManagerDataSource dataSource = new DriverManagerDataSource(); dataSource.setDriverClassName("com.mysql.jdbc.Driver"); dataSource.setUrl("jdbc:mysql://localhost:3306/spring"); dataSource.setUsername("cyp"); dataSource.setPassword("cyp"); // 创建JDBC 模板 JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource); jdbcTemplate.update("insert into account values(null,?,?)", "陈亚平",2000); } } -
mysql> select *from account; +----+-----------+-------+ | id | name | money | +----+-----------+-------+ | 1 | 陈亚平 | 2000 | +----+-----------+-------+ 1 row in set (0.00 sec)
整合Spring（spring管理dataSource和JdbcTemplate）
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Spring 配置文件配置
<bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/spring"></property> <property name="username" value="cyp"></property> <property name="password" value="cyp"></property> </bean> <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> -
测试类
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class JDBCTemplateTestWithSpring { @Resource(name="jdbcTemplate") private JdbcTemplate jdbcTemplate; @Test public void test1(){ jdbcTemplate.update("insert into account values(null,?,?)", "王红琳",2000); } }
c3p0 连接池的使用
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导入包
c3p0.jar -
Spring中配置连接池
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property> <property name="user" value="cyp"></property> <property name="password" value="cyp"></property> </bean> -
显示结果
使用属性文件配置连接池
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创建属性文件jdbc.properteis
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/spring jdbc.user=cyp jdbc.password=cyp -
配置文件中配置属性文件
<!-- 配置属性文件 --> <!-- 第一种方式：配置一个bean ,较少使用 --> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="classpath:jdbc.properteis"/> </bean> <!-- 第二种方式 使用context 标签--> <context:property-placeholder location="classpath:jdbc.properteis"/><!-- 配置属性文件 --> -
使用配置
<!-- 使用c3p0 连接池--> <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean>
3. 模板的 CRUD操作
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编写bean
public class Account { private int id; private String name; private double money; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getMoney() { return money; } public void setMoney(double money) { this.money = money; } @Override public String toString() { return "Account [id=" + id + ", name=" + name + ", money=" + money + "]"; } } -
编写AccountDaoImpl实现类,实现基本操作
public class AccountDaoImpl implements AccountDao{ private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } @Override public void add(Account account) { String sql = "insert into account values(null,?,?)"; jdbcTemplate.update(sql, account.getName(),account.getMoney()); } @Override public void delete(Integer id) { String sql = "delete from account where id = ?"; jdbcTemplate.update(sql, id); } @Override public void update(Account account) { String sql = "update account set name=? ,money=? where id=?"; jdbcTemplate.update(sql, account.getName(),account.getMoney(),account.getId()); } @Override public Account find(Integer id) { String sql = "select * from account where id = ?"; return jdbcTemplate.queryForObject(sql, new RowMapper<Account>(){ @Override public Account mapRow(ResultSet rs, int arg1) throws SQLException { Account account = new Account(); account.setId(rs.getInt("id")); account.setName(rs.getString("name")); account.setMoney(rs.getDouble("money")); return account; } }, id); } @Override public int getTotalCount() { String sql="select count(*) from account"; Integer count = jdbcTemplate.queryForObject(sql, Integer.class); return count; } } -
配置文件
<context:property-placeholder location="classpath:jdbc.properteis"/> <!-- 使用c3p0 连接池--> <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}"></property> <property name="jdbcUrl" value="${jdbc.url}"></property> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- 配置JdbcTemplate --> <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置UserDao --> <bean name="accountDao" class="com.ranger.spring.jdbc.dao.impl.AccountDaoImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean> -
编写测试类和测试方法
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class AccountDaoTest { @Resource(name="accountDao") private AccountDao accountDao; @Test public void add(){ Account account = new Account(); account.setName("小风"); account.setMoney(2000); accountDao.add(account); } @Test public void delete(){ accountDao.delete(2); } @Test public void update(){ Account account = new Account(); account.setId(4); account.setName("小王"); account.setMoney(2000); accountDao.update(account); } @Test public void find(){ Account account = accountDao.find(1); System.out.println(account); } @Test public void getTotal(){ int count = accountDao.getTotalCount(); System.out.println(count); } }