Question

我正在寻找一种从查询结果创建SQL语句的方法

基于包含列名，rowId和Value的查询结果，我想生成一个包含列名和该行要插入的值的查询。

示例：

Id | Row_Id | Column_Name   | Value            | Table
50 | 1      | Employee_Name | 'Joel'           | Employee
51 | 1      | Employee_Age  | '54'             | Employee
52 | 1      | Address       | '425 Baker Ave'  | Employee 
53 | 2      | Employee_Name | 'Jaret'          | Employee
54 | 2      | Employee_Age  | '29'             | Employee
55 | 2      | Address       | '423 Loma Rd'    | Employee
56 | 3      | Employee_Name | 'Jolie'          | Employee
57 | 3      | Employee_Age  | '37'             | Employee
58 | 3      | Address       | '896 Baren Blvd' | Employee
59 | 4      | Location      | 'Chicago'        | Office
60 | 4      | Address       | '264 Taler Ave'  | Office
61 | 5      | Location      | 'Detroit'        | Office
62 | 5      | Address       | '296 Forest Ln'  | Office

预期结果

INSERT INTO Employee (Employee_Name, Employee_Age, Address) VALUES ('Joel', '54', '425 Baker Ave')
INSERT INTO Employee (Employee_Name, Employee_Age, Address) VALUES ('Jaret', '29', '423 Loma Rd')
INSERT INTO Employee (Employee_Name, Employee_Age, Address) VALUES ('Jolie', '37', '896 Baren Blvd')
INSERT INTO Office (Location, Address) VALUES ('Chicago', '264 Taler Ave')
INSERT INTO Office (Location, Address) VALUES ('Detroit', '296 Forest Ln')

Answer 1

您可以通过一些有趣的窗口功能来做到这一点。这是一个示例。

（＃x用作具有您的结构，row_id，columnName，columnValue，tableName的表）

WITH foo AS (SELECT Id, Row_Id, columnName, columnValue, tableName, DENSE_RANK() OVER (ORDER BY Row_Id, tableName) AS sectionNumber, ROW_NUMBER() OVER (PARTITION BY Row_Id, tableName ORDER BY Id) AS rowNumberInSection FROM #x) SELECT 'INSERT INTO ' + tableName + ' (' + SUBSTRING(columnNames, 0, LEN(FEE.columnNames) - 1) + ' ) ' + ' VALUES (' + SUBSTRING(columnValues, 0, LEN(FEE.columnValues) - 1) + ' ) ' FROM ( SELECT tableName, ( SELECT columnName + ',' FROM foo f2 WHERE f2.sectionNumber = foo.sectionNumber ORDER BY f2.rowNumberInSection FOR XML PATH('') ) AS columnNames, ( SELECT columnValue + ',' FROM foo f3 WHERE f3.sectionNumber = foo.sectionNumber ORDER BY f3.rowNumberInSection FOR XML PATH('') ) AS columnValues FROM foo WHERE foo.rowNumberInSection = 1 ) FEE;

Answer 2

我不会生成INSERT语句。只需使用INSERT . . . SELECT进行条件聚合插入您想要的内容：

INSERT INTO TABLENAME (Employee_Name, Employee_Age, Address) 
    SELECT MAX(CASE WHEN name = 'Employee_Name' THEN value end),
           MAX(CASE WHEN name = 'Employee_Age' THEN value end),
           MAX(CASE WHEN name = 'Address' THEN value end)
    FROM <query> q 
    GROUP BY row_id;

Answer 3

我喜欢这种类型的问题:) 这是我的解决方案（使用动态查询）

      select *,cast('' as nvarchar(max)) script into #T from YourTable

      declare @Id int,@OldId int =0,@script nvarchar(300),@script2 nvarchar(300)

      update #T
      set @Id = row_Id,
          @script=Case when @Id!=@OldId then 'insert into '+[Table]+' ( '+Column_Name+')' else left(@script,len(@script)-1)+','+Column_Name+')' end,
          @script2=Case when @Id!=@OldId then ' Values('''+[Value]+''')' else left(@script2,len(@script2)-1)+','''+[Value]+''')' end,
          script = @script+@script2,
          @OldId=@Id
      select script from #T t join 
      (select row_Id,max(len(script)) lenScript from #T group by row_Id) X on t.row_Id=x.row_Id and X.lenScript=len(t.script)

      drop table #T

Answer 4

假设ID列具有唯一值，并且Row_Id在意义上仅对于一个INSERT INTO而言是唯一的，则它是相同的，您可以编写查询为：

select  distinct
         'Insert into ' +[Table] + 
         '(' +
          stuff((
          select ',' + t.[Column_Name]
          from Base t
          where t.Row_Id = t1.Row_Id
          order by t.[id]
          for xml path('')
          ),1,1,'') 
          +') VALUES ('
          +
          stuff((
          select ', ''' + t.[Value] + ''''
          from Base t
          where t.Row_Id = t1.Row_Id
          order by t.[id]
          for xml path('')
          ),1,1,'') 
          + ')'
from Base T1

此处测试代码：http://sqlfiddle.com/#!18/77430/1

如何根据表结果创建SQL插入语句

4 个答案: