1、判断数据库是否获得连接
@Test
public void test() throws SQLException {
DataSource bean = ioc.getBean(DataSource.class);
Connection connection = bean.getConnection();
System.out.println(connection);
}
2、sql 语句的按位更新、或插入
@Test
public void test02(){
//1、从容器中获取JdbcTemplate进行操作
String sql = "update employee set salary=? where emp_id=?";
int update = jdbcTemplate.update(sql, 1300,5);
System.out.println(update);
}
3、sql 语句的批量插入
@Test
public void test03(){
String sql = "INSERT INTO `employee`(`emp_name`,`salary`) VALUES (?,?)";
List<Object[]> args = new ArrayList<>();
args.add(new Object[]{"张三",9989.98});
args.add(new Object[]{"李四",19989.98});
jdbcTemplate.batchUpdate(sql,args);
}
4、查询单个对象
- 数据字段与数据库相同
BeanPropertyRowmapper用来将javaBean属性和查出的数据一一映射
@Test
public void test04(){
String sql = "select * from employee where emp_id=?";
Employee employee = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<>(Employee.class), 7);
}
- 数据字段与数据库不同 需重写方法
@Test
public void test04(){
String sql = "select * from employee where emp_id=?";
Employee employee = jdbcTemplate.queryForObject(sql, new RowMapper<Employee >(){
@Override
public Employee mapRow(ResultSet rs, int index)throws SQLException {
Employee temp = new Employee ();
temp.setAccountid(rs.getInt("id"));
temp.setLoginname(rs.getString("name"));
return temp;
}
}, 7);
}
4-2、查询集合对象
@Test
public void test04(){
String sql = "select * from employee where emp_id=?";
List<helgolandLog> employees = jdbcTemplate.query(sql, new RowMapper<Employee >(){
@Override
public Employee mapRow(ResultSet rs, int index)throws SQLException {
Employee temp = new Employee ();
temp.setAccountid(rs.getInt("id"));
temp.setLoginname(rs.getString("name"));
return temp;
}
}, 7);
}
5、使用带有具名参数的SQL语句插入一条记录，并以Map形式传入参数值
@Test
public void test07(){
String sql = "INSERT INTO `employee`(`emp_name`,`salary`) VALUES (:empName,:salary)";
Map<String, Object> map = new HashMap<>();
map.put("empName", "韩总");
map.put("salary", 40000.0);
//如果支持具名参数的功能。JdbcTemplate就不能用了。
/*MapSqlParameterSource source = new MapSqlParameterSource(map);
namedTemplate.update(sql, source);*/
namedTemplate.update(sql, map);
}
6、以SqlParameterSource形式传入参数值
@Test
public void test08(){
String sql = "INSERT INTO `employee`(`emp_name`,`salary`) VALUES (:empName,:salary)";
Employee employee = new Employee(null, "韩五", 499998.00);
//如果支持具名参数的功能。JdbcTemplate就不能用了。
//SqlParameterSource
//BeanPropertySqlParameterSource
//可以直接将Bean的属性映射参数进行处理
namedTemplate.update(sql, new BeanPropertySqlParameterSource(employee));
}
7、自动装配 JdbcTemplate 对象
@Test
public void test09(){
EmployeeDao bean = ioc.getBean(EmployeeDao.class);
Employee employee = new Employee(null, "韩五11", 499998.00);
bean.insert(employee);
}