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我目前正在尝试创建一个函数来解析错误消息,以使它们对最终用户更有帮助。目前我正在使用 SQLServer 和 VB.NET。

现在我提出错误 547,如下所示:

DELETE statement conflicted with COLUMN REFERENCE
constraint Constraint Name.  The conflict occurred
in database 'Database Name', table 'Table Name', 
column 'Column Name'.

提出它的声明是

DELETE FROM parentTable WHERE primaryKey = 5

我能够从错误消息中提取我需要的每条信息,除了 parentTable 的名称。我已经确定 SqlException 不存储导致异常的语句,据我所知,它不存储有关父表名称的信息,只存储试图引用它的表。

有没有一种简单的方法来获取父表的名称?

4

1 回答 1

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这是我几年前开发的一个例程,用于查询给定表的临时父/子关系:

---------------------------------------------------------------------
-- Name:    FKRelationships
-- Purpose: Map all parent/child relationships to the selected table
-- Date:    1/19/2009
-- Author:  John W. Dewey
-- Instructions:    1) Connect this script to the database containing
--                  the table you want to analyze
--                  2) Set the schema name and table name variables 
--                  Initializations section below. Be sure the table
--                  name variable does not contain the schema name
--                  3) You will get two result sets; the first will show
--                  the relational parent tables to your selected table, and
--                  the second will show the relational children to your
--                  selected table.
---------------------------------------------------------------------

---------------------------------------------------------------------
-- Declarations
declare @TableName nvarchar(128)
declare @SchemaName nvarchar(128)
declare @ParentTableSchema nvarchar(128)
declare @ParentTableName nvarchar(128)
declare @FKName nvarchar(128)
declare @Column nvarchar(128)
declare @Table nvarchar(128)
declare @Schema nvarchar(128)
declare @FKColumnString nvarchar(max)
declare @PKColumnString nvarchar(max)
declare @result table (
    [Parent Table] nvarchar(128)
    , [Child Table] nvarchar(128)
    , [Constraint] nvarchar(128)
    , [Relationship] nvarchar(max)
)
declare @FKTemp table (
    [id] int identity(1,1)
    , [Child Schema Name] nvarchar(128)
    , [Child Table Name] nvarchar(128)
    , [Child FK Name] nvarchar(128)
    , [Column Name] nvarchar(128)
)

---------------------------------------------------------------------
-- Initializations
set @SchemaName = 'dbo'
set @TableName = 'MyTable'

---------------------------------------------------------------------
-- Tables referenced by the specified table's FKs
declare c1 cursor for 
    select a.CONSTRAINT_NAME
    from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS a
    inner join INFORMATION_SCHEMA.TABLE_CONSTRAINTS b
        on a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
    where b.TABLE_NAME = @TableName
    and b.CONSTRAINT_SCHEMA = @SchemaName
open c1
fetch next from c1 into @FKName
while @@fetch_status=0 begin

    -- Build a string of each FK's corresponding columns
    set @FKColumnString = @SchemaName+'.'+@TableName+'.'
    declare c2 cursor for 
        select a.COLUMN_NAME from INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE a
        inner join INFORMATION_SCHEMA.COLUMNS b
            on a.TABLE_NAME = b.TABLE_NAME
            and a.COLUMN_NAME = b.COLUMN_NAME
        where a.CONSTRAINT_NAME=@FKName
        and a.TABLE_SCHEMA = @SchemaName
        order by b.ORDINAL_POSITION
    open c2
    fetch next from c2 into @Column
    while @@fetch_status=0 begin
        set @FKColumnString = @FKColumnString + '+' + @Column
        fetch next from c2 into @Column
    end
    set @FKColumnString = replace(@FKColumnString, '.+', '.')
    close c2
    deallocate c2

    -- Build a string of each PK's corresponding columns
    declare c3 cursor for
        select distinct c.TABLE_SCHEMA
            , c.table_name as [Parent Table Name]
        from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS a
        inner join INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE b
            on a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
        inner join INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE c
            on a.UNIQUE_CONSTRAINT_NAME = c.CONSTRAINT_NAME
        where b.table_name = @TableName
        and b.TABLE_SCHEMA = @SchemaName
        and a.CONSTRAINT_NAME = @FKName
    open c3
    fetch next from c3 into @ParentTableSchema, @ParentTableName
    while @@fetch_status=0 begin
        set @PKColumnString = @ParentTableSchema+'.'+@ParentTableName+'.'
        declare c4 cursor for
            select a.COLUMN_NAME from INFORMATION_SCHEMA.KEY_COLUMN_USAGE a
                inner join INFORMATION_SCHEMA.TABLE_CONSTRAINTS b
                    on a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
                    and b.CONSTRAINT_TYPE = 'PRIMARY KEY'
                where a.TABLE_NAME = @ParentTableName
                and a.TABLE_SCHEMA = @ParentTableSchema
                order by a.ORDINAL_POSITION
            open c4
            fetch next from c4 into @Column
            while @@fetch_status=0 begin
                set @PKColumnString = @PKColumnString + '+' + @Column
                fetch next from c4 into @Column
            end
            set @PKColumnString = replace(@PKColumnString, '.+', '.')
        close c4
        deallocate c4
        fetch next from c3 into @ParentTableSchema, @ParentTableName
        insert into @result ([Parent Table], [Child Table], [Constraint], [Relationship]) values (@ParentTableSchema+'.'+@ParentTableName, @SchemaName+'.'+@TableName, @SchemaName+'.'+@TableName+'.'+@FKName, @FKColumnString+' = '+@PKColumnString)
    end
    close c3
    deallocate c3
    fetch next from c1 into @FKName
end
close c1
deallocate c1

-- Display results
select 
    [Child Table] as [Selected Table as Child]
    , [Parent Table]
    , [Constraint] as [Child Constraint]
    , [Relationship] as [Relationship to Parent]
from @result

---------------------------------------------------------------------
-- FKs pointing to the specified table
delete from @result
insert into @FKTemp ([Child Schema Name], [Child Table Name], [Child FK Name], [Column Name])
select b.TABLE_SCHEMA as [Child Schema Name]
    , b.TABLE_NAME as [Child Table Name]
    , a.CONSTRAINT_NAME as [Child FK Name]
    , b.Column_Name as [Column Name]
from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS a
inner join INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE b
    on a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
inner join INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE c
    on a.UNIQUE_CONSTRAINT_NAME = c.CONSTRAINT_NAME
        and c.TABLE_NAME = @TableName
        and c.TABLE_SCHEMA = @SchemaName
inner join INFORMATION_SCHEMA.COLUMNS d
    on d.TABLE_SCHEMA = c.TABLE_SCHEMA
        and d.TABLE_NAME = c.table_name
        and d.COLUMN_NAME = b.COLUMN_NAME
order by d.ORDINAL_POSITION

-- Selected table's PK
set @PKColumnString = @SchemaName+'.'+@TableName+'.'
declare c1 cursor for
    select a.COLUMN_NAME from INFORMATION_SCHEMA.KEY_COLUMN_USAGE a
        inner join INFORMATION_SCHEMA.TABLE_CONSTRAINTS b
            on a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
            and b.CONSTRAINT_TYPE = 'PRIMARY KEY'
        where a.TABLE_NAME = @TableName
        and a.TABLE_SCHEMA = @SchemaName
        order by a.ORDINAL_POSITION
    open c1
    fetch next from c1 into @Column
    while @@fetch_status=0 begin
        set @PKColumnString = @PKColumnString + '+' + @Column
        fetch next from c1 into @Column
    end
    set @PKColumnString = replace(@PKColumnString, '.+', '.')
close c1
deallocate c1

-- Child tables' FKs
declare c1 cursor for select distinct [Child Schema Name], [Child Table Name] from @FKTemp
open c1
fetch next from c1 into @Schema, @Table
while @@fetch_status=0 begin
    set @FKColumnString = @SchemaName+'.'+@Table+'.'
    declare c2 cursor for select [Child FK Name], [Column Name]
    from @FKTemp
    where [Child Table Name] = @Table
    open c2
    fetch next from c2 into @FKName, @Column
    while @@fetch_status=0 begin
        set @FKColumnString = @FKColumnString + '+' + @Column
        fetch next from c2 into @FKName, @Column
    end
    close c2
    deallocate c2
    set @FKColumnString = replace(@FKColumnString, '.+', '.') + ' = ' + @PKColumnString
    insert into @result ([Parent Table], [Child Table], [Constraint], [Relationship]) values (@SchemaName+'.'+@TableName, @Schema+'.'+@Table, @Schema+'.'+@Table+'.'+@FKName, @FKColumnString)
    fetch next from c1 into @Schema, @Table
end
close c1
deallocate c1

-- Display results
select 
    [Parent Table] as [Selected Table as Parent]
    , [Child Table]
    , [Constraint] as [Child Constraint]
    , [Relationship] as [Relationship Parent]
from @result
于 2012-06-14T16:44:44.463 回答