Question

我有一个存储过程，其中在两个表上插入查询。 masters_table,child_table如您所见@Value1,@Value2,@Value3,@Value4有参数。我已经为每个块写了insert语句，我可以在这里使用循环来避免每个块的多次插入写入，假设我有第n个值然后我必须编写第n次块顺式插入查询，任何更好的方法来实现这个任务

Create proc sp_insert_master_child
    (
     @Details_Data custom_tb READONLY,
     @Value1 nvarchar(500),
     @Value2 nvarchar(500),
     @Value3 nvarchar(500),
     @Value4 nvarchar(500),
     @Value5 nvarchar(500),
     @Value6 nvarchar(500),
     @Value7 nvarchar(500)
    )
as begin 
    declare @id bigint 

    ------- block 1
    if @Value1 is not null
    begin
    insert into masters_table (col1,col2,col3))
    select  Substring(@Value1, 1,Charindex(',', @Value1)-1) as col_value_1,
    Substring(@Value1, Charindex(',', @Value1)+1, LEN(@Value1)) as  col_value_2
    select @id = @@IDENTITY

    insert into child_table (col1,col2,col3)
     SELECT @id,col_val_2,col_val_3 FROM @Details_Data WHERE blockType='blk_1';
     end

    ------ block 2
    if @Value2 is not null
     begin
    insert into masters_table (col1,col2,col3))
    select  Substring(@Value2, 1,Charindex(',', @Value2)-1) as col_value_1,
    Substring(@Value2, Charindex(',', @Value2)+1, LEN(@Value2)) as  col_value_2
    select @id = @@IDENTITY

    insert into child_table (col1,col2,col3)
     SELECT @id,col_val_2,col_val_3 FROM @Details_Data WHERE blockType='blk_2';
     end

    ------ block 3

    if @Value3 is not null
     begin
    insert into masters_table (col1,col2,col3))
    select  Substring(@Value3, 1,Charindex(',', @Value3)-1) as col_value_1,
    Substring(@Value3, Charindex(',', @Value2)+1, LEN(@Value3)) as  col_value_2
    select @id = @@IDENTITY

    insert into child_table (col1,col2,col3)
     SELECT @id,col_val_2,col_val_3 FROM @Details_Data WHERE blockType='blk_3';
     end

 ------ block 4

    .......


 ------ block 5

    .......

Answer 1

您可以将所有参数插入到表中。使用while循环并从表中逐行读取（参数）。

例如：

declare @x int

set @x= 1

declare @tmp table ( val int )

while (@x < noofrows)
begin
 ***********
 Use Top @x value to get row(parameter in your case) from table
perform your operation 
*************
increment x(set @X=@x+1)
end

循环SQL存储过程

1 个答案: