一、spring整合JDBC
1.spring提供了很多模板整合Dao技术
2.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.
JDBCTemplate => JDBC模板对象
与DBUtils中的QueryRunner非常相似.
//0 准备连接池
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql:///xieyupeng");
dataSource.setUser("root");
dataSource.setPassword("1234");
//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,'rose') ";
jt.update(sql);
3.整合步骤
3.1 导包
4+2:4代表:
2代表:com.springsource.org.apache.commons.logging-1.1.1.jar、com.springsource.org.apache.log4j-1.2.15.jar(老版本要导入的,导入可以保证一定能运行)
spring-test、spring-aop、junit4类库
c3p0连接池、JDBC驱动
spring-jdbc、spring-tx事务
3.2 准备数据库(两个字段id(自增长)和name即可)
3.3 书写Dao
//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;
}
}
3.4 spring配置
依赖关系
<!-- 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JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
<property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 3.将UserDao放入sp