mysql查询表名:
SELECT table_name FROM information_schema.tables WHERE table_schema='sell' AND table_type='base table';
查询表中的字段:
SELECT column_name FROM information_schema.columns WHERE table_schema='sell' AND table_name='seller_info'
SpringBoot 中mybatis 使用map的接收返回类型的时候为空的字段 不反回在配置文件中
mybatis.configuration.call-setters-on-nulls=true
今天做项目,遇到的问题就是需求修改数据表的记录,而且字段名都不是固定的,也就是说是需要通过参数传入的,
mybatis动态传表名和字段不规定个数进行条件查询使用map返回
也可以进行动态的表名字段 进行增删改
注意:表名要用${}以为表名不需要预编译
dao层:
List<Map<String, String>> getTableInfo(@Param("tableName") String tableName, @Param("cloums") List<Cloum> cloums); int addTableInfo(@Param("tableName") String tableName, @Param("cloums") List<Cloum> cloums); int updateTableINfo(@Param("tableName") String tableName, @Param("cloums") List<Cloum> cloums, @Param("id") String id); int delTableInfo(@Param("tableName") String tableName, @Param("ids") List<String> id);
mapper:
<select id="getTableInfo" resultType="map"> SELECT * FROM ${tableName} where 1=1 <if test="cloums != null"> <foreach collection="cloums" item="item" index="index" open="and" separator="and"> ${item.cloum}=#{item.val} </foreach> </if> </select> <insert id="addTableInfo" parameterType="com.cmbchina.ccd.itpm.entity.Cloum"> insert into ${tableName} <foreach collection="cloums" item="item" index="index" open="(" separator="," close=")"> ${item.cloum} </foreach> VALUES <foreach collection="cloums" item="item" index="index" open="(" separator="," close=")"> #{item.val} </foreach> </insert> <delete id="delTableInfo" parameterType="java.lang.String"> delete from ${tableName} where id IN <foreach collection="ids" item="item" index="index" open="(" separator="," close=")"> #{item} </foreach> </delete> <update id="updateTableINfo" parameterType="com.cmbchina.ccd.itpm.entity.Cloum"> update ${tableName} set <if test="cloums != null"> <foreach collection="cloums" item="item" index="index" separator=","> ${item.cloum}=#{item.val} </foreach> </if> where id = #{id} </update>
这里我是使用一个实体类接收字段和字段值进行传参
Cloum实体类:
public class Cloum { private String cloum; private String val; public String getCloum() { return cloum; } public void setCloum(String cloum) { this.cloum = cloum; } public String getVal() { return val; } public void setVal(String val) { this.val = val; } }
这样就可以了,本人已测试成功!