Question

是否可以在db中显示特定值的表的名称。我有不同的表，我想只显示在任何字段中包含特定值的表名。

Answer 1

这将返回许多空结果集，但非空的结果集对应于适合您搜索的表/列组合。它仅适用于文本，并检测包含该值的列（而不是完整列匹配。）

DELIMITER |

DROP PROCEDURE IF EXISTS `SearchAllTables`|
CREATE PROCEDURE `SearchAllTables` (
    IN _search varchar(256)
    )
LANGUAGE SQL
DETERMINISTIC
SQL SECURITY DEFINER
BEGIN
    -- declare stuff
    declare _tableName varchar(64);
    declare _columnName varchar(64);
    declare _done tinyint(1) default 0;

    -- we will examine every string column in the database
    declare _columnCursor cursor for
        select TABLE_NAME, COLUMN_NAME
            from INFORMATION_SCHEMA.COLUMNS
        where TABLE_SCHEMA = database()
        and (DATA_TYPE like '%char%' 
            or DATA_TYPE like 'text');
    declare CONTINUE handler for NOT FOUND
        SET _done = 1;

    OPEN _columnCursor;
    LOOP1: LOOP
            -- get the next table/column combination
        FETCH _columnCursor INTO _tableName,_columnName;
        IF _done = 1 THEN
            CLOSE _columnCursor;
            LEAVE LOOP1;
        END IF;

            -- query the current column to see if it holds the value
        SET @query = concat(
            "select '",_tableName,"' as TableName, '",
                      _columnName,"' as ColumnName 
            from ",_tableName," 
            where ",_columnName," like concat('%',?,'%') 
            group by 1;"
        );
        SET @search = _search;
        PREPARE _stmt FROM @query;
        EXECUTE _stmt USING @search;
        DEALLOCATE PREPARE _stmt;
    END LOOP LOOP1;
END|

DELIMITER ;

哦，是的，这很难看......但也许它会帮助你！

Answer 2

SELECT TABLE_NAME
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'database_name'
AND COLUMN_NAME = 'column_name'

显示存在值的表名

2 个答案: