我想知道如何安装尽可能可移植的 SQL 来查询表的所有列中的特定短语，例如：
桌子
ID | Name | text | Date | Author | Status
1 | Augusto Weiand | Test text | 2010-01-01 | Deividi | 1
查询
SELECT *
FROM table
WHERE columns LIKE '%augusto%2010%text%"
我没有提供足够的细节，对不起，我喜欢创建动态 SQL，我不需要用“AND”或“OR”指定列，就像在 Postgres 中可以做到的：
Select *
From table
Where table::text ~~ '%augusto%2010%text%'
以下是如何连接动态 SQL 中的值：
set @Pattern = '%augusto%';
select @q := concat('select * from Table1 ',
'where concat(', group_concat(column_name), ', "") like "', @Pattern, '"'
)
from information_schema.columns c
where table_name = 'Table1';
prepare st from @q;
execute st;
deallocate prepare st;
当然，动态SQL并不是特别可移植。 这个想法适用于大多数数据库。 代码看起来会有所不同。
已测试并可工作此处。
最后，您可以通过变量替换来做到这一点（这是更好的方法）：
select @q := concat('select * from Table1 ',
'where concat(', group_concat(column_name), ', "") like ?'
)
from information_schema.columns c
where table_name = 'Table1';
set @p = '%augusto%';
prepare st from @q;
execute st using @p;
deallocate prepare st;
还测试了(;-)。
这是可行的，尽管我强烈建议您研究全文搜索以提高效率；
为了避免在所有字段中一一查找所有模式，您可以直接在其中进行连接和搜索；
SELECT *
FROM (SELECT id,CONCAT(name,'|',text,'|',date,'|',author,'|',status) txt
FROM Table1) a
WHERE txt LIKE '%augusto%'
AND txt LIKE '%2010%'
AND txt LIKE '%text%';
请注意，这里没有索引对您有帮助，因为您正在计算列中搜索。另一方面，由于您使用前导通配符
%searchterm
Select * FROM table WHERE text LIKE "%text%"
OR date LIKE "%2010%"
OR Name LIKE "%augusto%"
如果您希望它们全部放在一起，请使用 AND
Select * FROM table WHERE text LIKE "%text%"
AND date LIKE "%2010%"
AND Name LIKE "%augusto%"
CREATE PROCEDURE dbo.sp_FindStringInTable @stringToFind VARCHAR(100),
@schema
sysname, @table sysname
AS
BEGIN TRY
DECLARE @sqlCommand varchar(max) = 'SELECT * FROM [' + @schema + '].[' +
@table + '] WHERE '
SELECT @sqlCommand = @sqlCommand + '[' + COLUMN_NAME + '] LIKE ''' +
@stringToFind + ''' OR '
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = @schema
AND TABLE_NAME = @table
AND DATA_TYPE IN ('char','nchar','ntext','nvarchar','text','varchar')
SET @sqlCommand = left(@sqlCommand,len(@sqlCommand)-3)
EXEC (@sqlCommand)
PRINT @sqlCommand
END TRY
BEGIN CATCH
PRINT 'There was an error. Check to make sure object exists.'
PRINT error_message()
END CATCH
像这样执行
EXEC sp_FindStringInTable '%searchword%','schema_name', 'tablename'
select
group_concat(
concat(
'select "',table_name,'" as table_name,
"',column_name,'" as column_name, ',
column_name,' as value
from ',table_name,'
where ',column_name,' like \'%test_value%\''
)
separator' union '
)
from information_schema.columns
where information_schema.columns.table_schema = 'schema_name'
and information_schema.columns.column_type not like '%int%'
and information_schema.columns.column_type not like '%double%'
and information_schema.columns.column_type not like '%decimal%'
and information_schema.columns.column_type not like '%float%'\G
（当然，将 schema_name
替换为您的架构/数据库名称，并将
test_value替换为您要搜索的内容。您也可以像子句一样省略 column_type ，但这会使创建的查询更大）注意：结果将是巨大的。 使用 \G 代替 ;以避免滚动多行破折号来复制语句。
然后复制并执行该语句。
例如我将从我的数据库模式之一复制并执行以下内容。
select "node_revision__field_subject_area" as table_name,"langcode" as
column_name, langcode as value from node_revision__field_subject_area
where langcode like '%our license agreements prohibit posting %' union
select "cache_library" as table_name,"cid" as column_name, cid as value
from cache_library where cid like '%our license agreements prohibit
posting %' union select "cache_library" as table_name,"data" as
column_name, data as value from cache_library where data like '%our
license agreements prohibit posting %' union select "cache_library" as
table_name,"tags" as column_name, tags as value from cache_library where
tags like '%our license agreements prohibit posting %' union select
"cache_library" as table_name,"checksum" as column_name, checksum as value
from cache_library where checksum like '%our license agreements prohibit
posting %' union select "semaphore" as table_name,"name" as column_name,
name as value from semaphore where name like '%our license agreements
prohibit posting %' union select "semaphore" as table_name,"value" as
column_name, value as value from semaphore where value like '%our license
agreements prohibit posting %' union select
"paragraph__field_position_title" as table_name,"bundle" as column_name,
bundle as value from paragraph__field_position_title where bundle like
'%our license agreements prohibit posting %' union select
"paragraph__field_position_title" as table_name,"langcode" as column_name,
langcode as value from paragraph__field_position_title where langcode like
'%our license agreements prohibit posting %' union select
"paragraph__field_position_title" as
table_name,"field_position_title_value" as column_name,
field_position_title_value as value from paragraph__field_position_title
where field_position_title_value like '%our license agreements prohibit
posting %';
当然，这个示例仅占我们实际 drupal 数据库生成的查询的 5%，该数据库拥有超过 2750 个不同的字段。