为什么我计算不了表的记录总条数？

Question

<!-- 查询当前表有多少条记录 -->
<select id="total" resultType="java.lang.Integer">
 SELECT COUNT(*) FROM t_area

 

@Override
public int total() throws Exception{

return areaMapper.total();
}

Answer 1

SELECT COUNT(*) FROM t_area 换成SELECT COUNT(1) FROM t_area 试试

Answer 2

resultType="int"试试

Answer 3

cout(id)