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   源码介绍

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根据表中记录生成insert语句

CREATE  PROCEDURE InsertGenerator
    (
      @tableName NVARCHAR(MAX),
      @whereClause NVARCHAR(MAX)
    )
AS 

--Then it includes a cursor to fetch column specific information (column name and the data type thereof) 
--from information_schema.columns pseudo entity and loop through for building the INSERT and VALUES clauses 
--of an INSERT DML statement.

    DECLARE @string NVARCHAR(MAX) --for storing the first half of INSERT statement
    DECLARE @stringData NVARCHAR(MAX) --for storing the data (VALUES) related statement
    DECLARE @dataType NVARCHAR(MAX) --data types returned for respective columns
    DECLARE @schemaName NVARCHAR(MAX) --schema name returned from sys.schemas
    DECLARE @schemaNameCount int--shema count
    DECLARE @QueryString  NVARCHAR(MAX) -- provide for the whole query, 

    set @QueryString=' '

     --如果有多个schema，选择其中一个schema
    SELECT @schemaNameCount=COUNT(*)
    FROM    sys.tables t
            INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
    WHERE   t.name = @tableName

    WHILE(@schemaNameCount>0)
    BEGIN

    --如果有多个schema，依次指定
    select @schemaName = name 
    from 
    (
        SELECT ROW_NUMBER() over(order by  s.schema_id) RowID,s.name
        FROM    sys.tables t
                INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
        WHERE   t.name =  @tableName
    ) as v
    where RowID=@schemaNameCount

    --Declare a cursor to retrieve column specific information 
    --for the specified table
    DECLARE cursCol CURSOR FAST_FORWARD
    FOR
        SELECT  column_name ,
                data_type
        FROM    information_schema.columns
        WHERE   table_name = @tableName
                AND table_schema = @schemaName
 
    OPEN cursCol
    SET @string = 'INSERT INTO ['   @schemaName   '].['   @tableName   ']('
    SET @stringData = ''

    DECLARE @colName NVARCHAR(500)

    FETCH NEXT FROM cursCol INTO @colName, @dataType

    PRINT @schemaName
    PRINT @colName
    IF @@fetch_status <> 0
        BEGIN
            PRINT 'Table '   @tableName   ' not found, processing skipped.'
            CLOSE curscol
            DEALLOCATE curscol
            RETURN
        END

    WHILE @@FETCH_STATUS = 0
        BEGIN
            IF @dataType IN ( 'varchar', 'char', 'nchar', 'nvarchar' )
                BEGIN
                       SET @stringData = @stringData   ''''''''' 
                            isnull('   @colName   ','''') '''''','' '
                END
            ELSE
                IF @dataType IN ( 'text', 'ntext' ) --if the datatype 
                                 --is text or something else 
                    BEGIN
                        SET @stringData = @stringData   ''''''''' 
          isnull(cast('   @colName   ' as nvarchar(max)),'''') '''''','' '
                    END
                ELSE
                    IF @dataType = 'money' --because money doesn't get converted 
                       --from varchar implicitly
                        BEGIN
                            SET @stringData = @stringData
                                  '''convert(money,'''''' 
        isnull(cast('   @colName
                                  ' as nvarchar(max)),''0.0000'') ''''''),'' '
                        END
                    ELSE
                        IF @dataType = 'datetime'
                            BEGIN
                                SET @stringData = @stringData
                                      '''convert(datetime,'''''' 
        isnull(cast('   @colName   ' as nvarchar(max)),''0'') ''''''),'' '
                            END
                        ELSE
                            IF @dataType = 'image'
                                BEGIN
                                    SET @stringData = @stringData   ''''''''' 
       isnull(cast(convert(varbinary,'   @colName   ') 
       as varchar(6)),''0'') '''''','' '
                                END
                            ELSE --presuming the data type is int,bit,numeric,decimal 
                            BEGIN
                                    SET @stringData = @stringData   ''''''''' 
          isnull(cast('   @colName   ' as nvarchar(max)),''0'') '''''','' '
                                END

            SET @string = @string   '['   @colName   ']'   ','

            FETCH NEXT FROM cursCol INTO @colName, @dataType
        END
--After both of the clauses are built, the VALUES clause contains a trailing comma which needs to be replaced with a single quote. The prefixed clause will only face removal of the trailing comma.

    DECLARE @Query NVARCHAR(MAX) -- provide for the whole query, 
                              -- you may increase the size
    PRINT @whereClause
    IF ( @whereClause IS NOT NULL
         AND @whereClause <> ''
       )
        BEGIN  
            SET @query = 'SELECT '''   SUBSTRING(@string, 0, LEN(@string))
                  ') VALUES(''  '   SUBSTRING(@stringData, 0,
                                              LEN(@stringData) - 2)
                  ''' '')'' 
   FROM '  @schemaName '.'  @tableName   ' WHERE '   @whereClause
            PRINT @query
           -- EXEC sp_executesql @query --load and run the built query
--Eventually, close and de-allocate the cursor created for columns information.
        END
    ELSE
  BEGIN 
            SET @query = 'SELECT '''   SUBSTRING(@string, 0, LEN(@string))
                  ') VALUES(''  '   SUBSTRING(@stringData, 0,
                                              LEN(@stringData) - 2)
                  ''' '')'' 
    FROM '   @schemaName '.'  @tableName

        END

    CLOSE cursCol
    DEALLOCATE cursCol

    SET @schemaNameCount=@schemaNameCount-1
    IF(@schemaNameCount=0)
    BEGIN
       SET @QueryString=@QueryString @query
    END
    ELSE
    BEGIN
        SET @QueryString=@QueryString @query ' UNION ALL '
    END
    PRINT convert(varchar(max),@schemaNameCount) '---' @QueryString
    END
    EXEC sp_executesql @QueryString --load and run the built query
--Eventually, close and de-allocate the cursor created for columns information.