从数据库中删除

Question

我想删除数据库中每个表的特定属性。例如：我想从数据库中的每个表中删除值为'2'的CustomerID（列名）

我试图删除有客户字段的记录，并且其值为2但我得到一个错误，说有关键字删除附近有不正确的语法

declare @SearchTerm nvarchar(4000) 
declare @ColumnName sysname 

set @SearchTerm = N'2' -- Term to be searched for 
set @ColumnName = N'customerID' --**column** 

set nocount on 

declare @TabCols table (
     id int not null primary key identity 
     , table_schema sysname not null 
     , table_name sysname not null 
     , column_name sysname not null 
     , data_type sysname not null 
) 

insert into @TabCols (table_schema, table_name, column_name, data_type) 
    select 
     t.TABLE_SCHEMA, c.TABLE_NAME, c.COLUMN_NAME, c.DATA_TYPE 
    from INFORMATION_SCHEMA.TABLES t 
    join INFORMATION_SCHEMA.COLUMNS c on t.TABLE_SCHEMA = c.TABLE_SCHEMA 
             and t.TABLE_NAME = c.TABLE_NAME 
    where 1 = 1 
     and t.TABLE_TYPE = 'base table' 
     and c.DATA_TYPE not in ('image', 'sql_variant') 
     and c.COLUMN_NAME like case when len(@ColumnName) > 0 then @ColumnName else '%' end 
    order by c.TABLE_NAME, c.ORDINAL_POSITION 

declare 
    @table_schema sysname 
, @table_name sysname 
, @column_name sysname 
, @data_type sysname 
, @exists nvarchar(4000) -- Can be max for SQL2005+ 
, @sql nvarchar(4000) -- Can be max for SQL2005+ 
, @where nvarchar(4000) -- Can be max for SQL2005+ 
, @run nvarchar(4000) -- Can be max for SQL2005+ 


while exists (select null from @TabCols) begin 

select top 1 
     @table_schema = table_schema 
    , @table_name = table_name 
    -- , @exists = 'select null from [' + table_schema + '].[' + table_name + '] where 1 = 0' 
    , @sql = 'delete''' + '[' + table_schema + '].[' + table_name + ']' + ''' as TABLE_NAME, from [' + table_schema + '].[' + table_name + '] where 1 = 0' 
    , @where = '' 
from @TabCols 
order by id 

while exists (select null from @TabCols where table_schema = @table_schema and table_name = @table_name) begin 

    select top 1 
      @column_name = column_name 
     , @data_type = data_type 
    from @TabCols 
    where table_schema = @table_schema 
     and table_name = @table_name 
    order by id 

    -- Special case for money 
    if @data_type in ('money', 'smallmoney') begin 
     if isnumeric(@SearchTerm) = 1 begin 
      set @where = @where + ' or [' + @column_name + '] = cast(''' + @SearchTerm + ''' as ' + @data_type + ')' -- could also cast the column as varchar for wildcards 
     end 
    end 
    -- Special case for xml 
    else if @data_type = 'xml' begin 
     set @where = @where + ' or cast([' + @column_name + '] as nvarchar(max)) like ''' + @SearchTerm + '''' 
    end 
    -- Special case for date 
    else if @data_type in ('date', 'datetime', 'datetime2', 'datetimeoffset', 'smalldatetime', 'time') begin 
     set @where = @where + ' or convert(nvarchar(50), [' + @column_name + '], 121) like ''' + @SearchTerm + '''' 
    end 
    -- Search all other types 
    else begin 
     set @where = @where + ' or [' + @column_name + '] like ''' + @SearchTerm + '''' 
    end 

    delete from @TabCols where table_schema = @table_schema and table_name = @table_name and column_name = @column_name 

end 

set @run = 'if exists(' + @exists + @where + ') begin ' + @sql + @where + ' print ''' + @table_name + ''' end' 
print @run 
exec sp_executesql @run 

end 

set nocount off 

Answer 1

这里是另一种基于ewahner发布的例子。最大的区别是这不使用游标，因为你真的不需要这个游标。

declare @columnName nvarchar(255) 
declare @intValue int 
set @columnName = 'CustomerId' 
set @intValue = 1 
declare @DeleteValue varchar(10) 
set @DeleteValue = convert(varchar(10), @intValue) 

declare @sql nvarchar(max) = '' 

select @sql = @sql + 'delete ' + object_name(c.object_id) + ' where ' + @columnName + ' = ' + @DeleteValue + ';' 
from sys.columns c 
where c.name = @columnName 

select @sql 

/* Uncomment the line below in order to run */ 
--exec sp_executesql @sql 

Answer 2

使用需要您自担风险。您将需要取消注释执行行。但首先运行它，不要取消注释，以确保它获得所需的表格。

declare @columnName nvarchar(255) 
declare @intValue int 
set @columnName = 'CustomerId' 
set @intValue = 1 
declare curs cursor for 
    select object_name(c.object_id) as tableName 
     from sys.columns c 
    where c.name = @columnName 

declare @tableName nvarchar(255) 
open curs 
fetch next from curs into @tableName 
while @@fetch_status = 0 
begin 

    declare @sql nvarchar(1000) 

    set @sql = 'delete ' + @tableName + ' where ' + @columnName + '=' + convert(varchar(10), @intValue) 

    print @sql 
    /* Uncomment the line below in order to run */ 
    --exec sp_executesql @sql 
    fetch next from curs into @tableName 
end 
close curs 
deallocate curs