spring整合JDBC
spring提供了很多模板整合Dao技术
其中JdbcTemplate封装了JDBC技术，其与DBUtils中的QueryRunner非常相似.
与Web结合步骤：
1、导包
4+2
spring-test
spring-aop
junit4类库
c3p0连接池
JDBC驱动
spring-jdbc
spring-tx事务
2、书写Dao
获取JdbcTemplate对象的方法
方式一：
继承JdbcDaoSupport类，使用super.getJdbcTemplate()获取
public class UserDaoImpl extends JdbcDaoSupport implements UserDao{
// private JdbcTemplate jt;
// public void setJt(JdbcTemplate jt) {
// this.jt = jt;
// }
@Override
public void save(User u) {
String sql = "insert into user values (null,?) ";
super.getJdbcTemplate().update(sql,u.getName());
}
@Override
public void delete(Integer id) {
String sql = "delete from user where id=?";
super.getJdbcTemplate().update(sql,id);
}
@Override
public void update(User u) {
String sql = "update user set name=? where id=?";
super.getJdbcTemplate().update(sql,u.getName(),u.getId());
}
@Override
public User getById(Integer id) {
String sql = "select * from user where id=?";
User u = super.getJdbcTemplate().queryForObject(sql, new RowMapper<User>() {
@Override
public User mapRow(ResultSet resultSet, int i) throws SQLException {
User u = new User();
u.setId(resultSet.getInt("id"));
u.setName(resultSet.getString("name"));
return u;
}
}, id);
return u;
}
@Override
public int getTotalCount() {
String sql = "select count(*) from user";
Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);
return count;
}
@Override
public List<User> getAll() {
String sql = "select * from user";
List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>() {
@Override
public User mapRow(ResultSet resultSet, int i) throws SQLException {
User u = new User();
u.setId(resultSet.getInt("id"));
u.setName(resultSet.getString("name"));
return u;
}
});
return list;
}
}