SQL Server : fetch next from inside fetch next from [duplicate] - sql-server

Question

I have the following query, I want use a nested cursor in my query. How to do this, because it's not running and I am new to SQL Server. Please help me
CHECK TABLE SUGGEST LAT 31.8181 LONG 71.4146
Msg 16915, Level 16, State 1, Procedure Sp_CheckCarStatusMeter, Line
266
A cursor with the name 'ShapeCursor' already exists. ELSE OPEN
CURSOR
Msg 16905, Level 16, State 1, Procedure Sp_CheckCarStatusMeter,
Line 296
The cursor is already open.
Code:
DECLARE SuggestCursor CURSOR FOR
SELECT TOP 100
rtha.car_id, rtha.latitude, rtha.longitude
FROM
Carhistory rtha
WHERE
rtha.car_id = 6142 ;
OPEN SuggestCursor;
FETCH NEXT FROM SuggestCursor INTO #CarSuggested, #carlatprevious, #carlongprevious;
WHILE (##FETCH_STATUS = 0)
BEGIN
PRINT 'CHECK TABLE SUGGEST LAT '+#carlatprevious +' LONG '+ #carlongprevious;
DECLARE ShapeCursor CURSOR FOR
SELECT
g.ID, #carID, g.ShapeType
FROM
tblgeo AS g
WHERE
car_id #ID;
IF (SELECT CURSOR_STATUS('local','ShapeCursor')) >= -1
BEGIN
Print 'DEALLOCATE CURSOR'
--DEALLOCATE ShapeCursor
END
ELSE
Print 'ELSE OPEN CURSOR'
OPEN ShapeCursor;
FETCH NEXT FROM ShapeCursor INTO #ID, #CarIdx, #ShapeType;
WHILE (##FETCH_STATUS = 0)
BEGIN

Answer 1

Example with nested cursors:
DECLARE
#crTables CURSOR,
#crColumns CURSOR,
#table_id INT,
#table_name VARCHAR(100),
#column_id INT,
#column_name VARCHAR(100)
SET #crTables = CURSOR FAST_FORWARD FOR
SELECT TOP 10 [object_id], NAME
FROM sys.tables t
ORDER BY t.[object_id] DESC
OPEN #crTables
FETCH NEXT FROM #crTables
INTO #table_id, #table_name
WHILE ##FETCH_STATUS = 0
BEGIN
PRINT #table_name + ': '
SET #crColumns = CURSOR FAST_FORWARD FOR
SELECT TOP 10 c.column_id, c.name
FROM sys.[columns] c
WHERE c.[object_id] = #table_id
ORDER BY c.column_id
OPEN #crColumns
FETCH NEXT FROM #crColumns
INTO #column_id, #column_name
WHILE ##FETCH_STATUS = 0
BEGIN
PRINT #column_name
FETCH NEXT FROM #crColumns
INTO #column_id, #column_name
END
CLOSE #crColumns
DEALLOCATE #crColumns
PRINT ''
FETCH NEXT FROM #crTables
INTO #table_id, #table_name
END
CLOSE #crTables
DEALLOCATE #crTables
GO
Which will give the same result as:
GO
DECLARE #txt VARCHAR(MAX)
SET #txt =
STUFF(
(
SELECT TOP 10
CHAR(13) + CHAR(10) + NAME
+ (
SELECT TOP 10 CHAR(13) + CHAR(10) + c.name
FROM sys.[columns] c
WHERE c.[object_id] = t.[object_id]
ORDER BY c.column_id
FOR XML PATH(''), TYPE
).value('.', 'VARCHAR(MAX)')
+ CHAR(13) + CHAR(10)
FROM sys.tables t
ORDER BY t.[object_id] DESC
FOR XML PATH(''), TYPE
).value('.', 'VARCHAR(MAX)'), 1, 2, '')
PRINT #txt
Try to avoid cursors.