springboot mybatis注解方式批量insert和使用in语句查询
1、批量插入
@Insert({
"<script>",
"insert into sys_user_role(user_id,role_id) values ",
"<foreach collection=‘roles‘ item=‘item‘ index=‘index‘ separator=‘,‘>",
"(#{item.userId}, #{item.roleId})",
"</foreach>",
"</script>"
})
int insertByBatch(@Param(value = "roles") List<SysUserRole> roles);通过@Param指定集合参数,item为集合内每个对象,index为集合自然序号
2、使用in语句查询
@Select({
"<script>",
"select count(0) from sys_role where id in ",
"<foreach collection=‘roleIds‘ item=‘item‘ index=‘index‘ open=‘(‘ separator=‘,‘ close=‘)‘>",
"(#{item})",
"</foreach>",
"</script>"
})
Integer checkRoleId(@Param(value = "roleIds") List<Long> roleIds);查询要特别指定开闭的左右括号