运用Mybatis动态查询字段及表名

Mapper.java

IPage> getDyData(@Param("page") Page page, @Param("columns")String columns, @Param("tableName")String tableName);

Mapper.xml

select      ${columns}from     ${tableName}  dy

使用场景：

我们必须知道查询的表名，可以通过表名查询字段及注释，然后把表名和字段传进mapper

如果知道具体查询哪些表，可以把这些表及表对应的字段配置进一张表和字段对应的表中，通过表名查询该表取出对应的字段及注释，此处的字段注释可以自己写相对比较灵活。

DROP TABLE IF EXISTS `table_colume_mapping`;CREATE TABLE `table_colume_mapping`  (  `table_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '表名',  `column_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '字段名',  `column_comment` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '字段汉语名',  `table_comment` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '表名注释',  `sort` int(10) NULL DEFAULT NULL COMMENT '字段排序',  `show_column` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT '是' COMMENT '是否展示在列',  `del_flag` char(1) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT '0' COMMENT '0存在1删除') ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '表字段注释映射' ROW_FORMAT = Dynamic;SET FOREIGN_KEY_CHECKS = 1;

调用

LambdaQueryWrapper wrapper = new LambdaQueryWrapper<>();wrapper.eq(TableColumeMapping::getTableName, "查询的表名");List list = springContextHolder.getBean(TableColumeMapping.class).list(wrapper);Map tableColumeMap = list.stream().collect(Collectors.toMap(TableColumMapperPerson::getColumnName, account -> account));String columnNames = list.stream().map(item -> "dy."+item.getColumnName()).collect(Collectors.joining(","));IPage> result = this.baseMapper.getDyData(page,columnNames,"查询的表名");

来源地址：https://blog.csdn.net/qq_37931185/article/details/130066498