How can I modify a stored procedure to include multiple tables - sql

Question

Hi this Stored Procedure works for one table, I wondered can it be expanded to more than one table so that the returned values technically searches across multiple tables. I have read similar posts which cover an entire database but limiting to a small cluster of tables rather than having to do each manually.
Basically so the final execute runs this below basically going through all tables which start with LZO_AE
#table_name ='LZO_AE%'
IF NOT EXISTS (
SELECT *
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_NAME = 'spSearchStringInTable'
AND ROUTINE_TYPE = 'PROCEDURE'
)
EXECUTE ('CREATE PROCEDURE dbo.spSearchStringInTable AS SET NOCOUNT ON;');
GO
ALTER PROCEDURE spSearchStringInTable (
#SearchString NVARCHAR(MAX)
,#Table_Schema SYSNAME = 'dbo'
,#Table_Name SYSNAME
)
AS
BEGIN
DECLARE #Columns NVARCHAR(MAX)
,#Cols NVARCHAR(MAX)
,#PkColumn NVARCHAR(MAX)
-- Get all character columns
SET #Columns = STUFF((
SELECT ', ' + QUOTENAME(Column_Name)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE DATA_TYPE IN (
'text'
,'ntext'
,'varchar'
,'nvarchar'
,'char'
,'nchar'
,'int'
)
AND TABLE_NAME = #Table_Name
AND TABLE_SCHEMA = #Table_Schema
ORDER BY COLUMN_NAME
FOR XML PATH('')
), 1, 2, '');
IF #Columns IS NULL -- no character columns
RETURN - 1;
-- Get columns for select statement - we need to convert all columns to nvarchar(max)
SET #Cols = STUFF((
SELECT ', CAST(' + QUOTENAME(Column_Name) + ' AS nvarchar(max)) COLLATE DATABASE_DEFAULT AS ' + QUOTENAME(Column_Name)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE DATA_TYPE IN (
'text'
,'ntext'
,'varchar'
,'nvarchar'
,'char'
,'nchar'
,'int'
)
AND TABLE_NAME = #Table_Name
AND TABLE_SCHEMA = #Table_Schema
ORDER BY COLUMN_NAME
FOR XML PATH('')
), 1, 2, '');
SET #PkColumn = STUFF((
SELECT N' + ''|'' + ' + ' CAST(' + QUOTENAME(CU.COLUMN_NAME) + ' AS nvarchar(max)) COLLATE DATABASE_DEFAULT '
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS TC
INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS CU ON TC.CONSTRAINT_TYPE = 'PRIMARY KEY'
AND TC.CONSTRAINT_NAME = CU.CONSTRAINT_NAME
WHERE TC.TABLE_SCHEMA = #Table_Schema
AND TC.TABLE_NAME = #Table_Name
ORDER BY CU.ORDINAL_POSITION
FOR XML PATH('')
), 1, 9, '');
IF #PkColumn IS NULL
SELECT #PkColumn = 'CAST(NULL AS nvarchar(max))';
-- set select statement using dynamic UNPIVOT
DECLARE #SQL NVARCHAR(MAX)
SET #SQL = 'SELECT *, ' + QUOTENAME(#Table_Schema, '''') + ' AS [Table Schema], ' + QUOTENAME(#Table_Name, '''') + ' AS [Table Name]' + ' FROM
(SELECT ' + #PkColumn + ' AS [PK Column], ' + #Cols + ' FROM ' + QUOTENAME(#Table_Schema) + '.' + QUOTENAME(#Table_Name) + ' ) src UNPIVOT ([Column Value] for [Column Name] IN (' + #Columns + ')) unpvt
WHERE [Column Value] LIKE ''%'' + #SearchString + ''%'''
--print #SQL
EXECUTE sp_ExecuteSQL #SQL
,N'#SearchString nvarchar(max)'
,#SearchString;
END
GO
execute
dbo.spSearchStringInTable
#SearchString = N'410605003',
#table_schema = 'dbo',
#table_name ='LZO_AETRIAGETREATMENTHISTORY'

Answer 1

You could use a CURSOR to retrieve the matching table names and then process each one in a loop. For example,
ALTER PROCEDURE [dbo].[multi_table_test] AS
BEGIN
SET NOCOUNT ON;
DECLARE #table_pattern NVARCHAR(max);
DECLARE #table_name NVARCHAR(max);
DECLARE #sql NVARCHAR(max)
DECLARE #output_table TABLE (table_name NVARCHAR(max), row_count INT);
DECLARE #row_count INT;
SET #table_pattern = N'LZO_AE%';
DECLARE table_list CURSOR FOR
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE #table_pattern;
OPEN table_list;
FETCH NEXT FROM table_list INTO #table_name;
WHILE ##FETCH_STATUS = 0
BEGIN
SET #sql = N'SELECT #n = (SELECT COUNT(*) FROM [' + #table_name + N'])';
EXEC sp_executesql #sql, N'#n INT OUTPUT', #n = #row_count OUTPUT;
INSERT INTO #output_table (table_name, row_count) VALUES (#table_name, #row_count);
FETCH NEXT FROM table_list INTO #table_name;
END
CLOSE table_list;
DEALLOCATE table_list;
SELECT table_name, row_count FROM #output_table;
END
returns this
table_name row_count
---------- ---------
LZO_AE01 3
LZO_AE02 5