首页 > 软件编程 > java > Mybatis-plus查询@TableLogic逻辑删除后数据

Mybatis-plus自定义SQL注入器查询@TableLogic逻辑删除后的数据详解

2023-03-09 10:50:28 作者：Hi，all

这篇文章主要给大家介绍了关于Mybatis-plus自定义SQL注入器查询@TableLogic逻辑删除后的数据的相关资料,文中通过实例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1 需求

Mybatis-plus使用@TableLogic注解进行逻辑删除数据后，在某些场景下，又需要查询该数据时，又不想写SQL。

2 解决方案

自定义Mybatis-plus的SQL注入器一劳永逸的解决该问题

3 方案：

3.1 方案1，继承 AbstractMethod拼接SQL语句

public class SelectIgnoreLogicDeleteByMap extends AbstractMethod {
 
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
 
        String sqlBase= "<script>SELECT %s FROM %s %s\n</script>";
        String sqlScript = this.sqlWhereByMap(tableInfo);
        String sql = String.format(sqlBase, this.sqlSelectColumns(tableInfo, false), tableInfo.getTableName(), sqlScript);
        SqlSource sqlSource = this.languageDriver.createSqlSource(this.configuration, sql, Map.class);
        return this.addSelectMappedStatementForTable(mapperClass, "selectIgnoreLogicDeleteByMap", sqlSource, tableInfo);
    }
 
    /**
     * 拼接where条件根据map参数
     *
     * @param table 表
     * @return sql
     */
    protected String sqlWhereByMap(TableInfo table) {
        String sqlScript;
        sqlScript = SqlScriptUtils.convertChoose("v == null", " ${k} IS NULL ", " ${k} = #{v} ");
        sqlScript = SqlScriptUtils.convertForeach(sqlScript, "cm", "k", "v", "AND");
        sqlScript = SqlScriptUtils.convertWhere(sqlScript);
        sqlScript = SqlScriptUtils.convertIf(sqlScript, String.format("%s != null and !%s", "cm", "cm.isEmpty"), true);
        return sqlScript;
    }
}

3.2. 方案2，继承 AbstractMethod拼接SQL语句

public class SelectIgnoreLogicDelete extends AbstractMethod {
 
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
 
        String sqlBase = "<script>%s SELECT %s FROM %s %s %s %s\n</script>";
 
        String sql = String.format(sqlBase, this.sqlFirst(), this.sqlSelectColumns(tableInfo, true), tableInfo.getTableName(), this.sqlWhereEntityWrapper(true, tableInfo), this.sqlOrderBy(tableInfo), this.sqlComment());
        SqlSource sqlSource = this.languageDriver.createSqlSource(this.configuration, sql, modelClass);
        return this.addSelectMappedStatementForTable(mapperClass, "selectIgnoreLogicDelete", sqlSource, tableInfo);
    }
 
    /**
     * 拼接where条件
     *
     * @param newLine 新行
     * @param table   表
     * @return sql
     */
    protected String sqlWhereEntityWrapper(boolean newLine, TableInfo table) {
        String sqlScript = table.getAllSqlWhere(false, true, "ew.entity.");
        sqlScript = SqlScriptUtils.convertIf(sqlScript, String.format("%s != null", "ew.entity"), true);
        sqlScript = sqlScript + "\n";
        sqlScript = sqlScript + SqlScriptUtils.convertIf(String.format(SqlScriptUtils.convertIf(" AND", String.format("%s and %s", "ew.nonEmptyOfEntity", "ew.nonEmptyOfNormal"), false) + " ${%s}", "ew.sqlSegment"), String.format("%s != null and %s != '' and %s", "ew.sqlSegment", "ew.sqlSegment", "ew.nonEmptyOfWhere"), true);
        sqlScript = SqlScriptUtils.convertWhere(sqlScript) + "\n";
        sqlScript = sqlScript + SqlScriptUtils.convertIf(String.format(" ${%s}", "ew.sqlSegment"), String.format("%s != null and %s != '' and %s", "ew.sqlSegment", "ew.sqlSegment", "ew.emptyOfWhere"), true);
        sqlScript = SqlScriptUtils.convertIf(sqlScript, String.format("%s != null", "ew"), true);
        return newLine ? "\n" + sqlScript : sqlScript;
    }

4. 自定义SQL注入器，注册上述自定义的方法

public class CustomSqlInjector extends DefaultSqlInjector {
 
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass, TableInfo tableInfo) {
        List<AbstractMethod> methodList = super.getMethodList(mapperClass, tableInfo);
        methodList.add(new SelectIgnoreLogicDeleteByMap());
        methodList.add(new SelectIgnoreLogicDelete());
        return methodList;
    }
}

5. 自定义基础mapper，声明注册的方法

public interface CustomBaseMapper<T> extends BaseMapper<T> {
 
    /**
     * 根据map条件查询数据，并忽略逻辑删除
     *
     * @param columnMap 查询条件
     * @return 结果信息
     */
    List<T> selectIgnoreLogicDeleteByMap(@Param("cm") Map<String, Object> columnMap);
 
    /**
     * 根据条件查询数据，并忽略逻辑删除
     *
     * @param queryWrapper 查询条件
     * @return 结果信息
     */
    List<T> selectIgnoreLogicDelete(@Param("ew") Wrapper<T> queryWrapper);
}

6. 使用声明的方法

6.1 业务mapper继承自定义的CustomBaseMapper

@Mapper
public interface UserMapper extends CustomBaseMapper<User> {
}

6.2 调用方法selectIgnoreLogicDelete

    @Override
    public List<User> getIgnoreDeleteById(Long userId) {
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getId,userId);
        return this.baseMapper.selectIgnoreLogicDelete(queryWrapper);
    }

6.3 调用方法selectIgnoreLogicDeleteByMap

    @Override
    public List<User> getIgnoreDeleteById(Long userId) {
		Map<String, Object> columnMap = new HashMap<>(2);
        columnMap.put("id", userId);
        return this.baseMapper.selectIgnoreLogicDeleteByMap(columnMap);
    }

总结

到此这篇关于Mybatis-plus自定义SQL注入器查询@TableLogic逻辑删除后的数据的文章就介绍到这了,更多相关Mybatis-plus查询@TableLogic逻辑删除后数据内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！