Loop through SQL Table valued parameter - sql-server

Question

I'm trying to achieve a advanced search functionality for my application in which i have a SQL Table Valued Parameter in the following structure,
ColumnName Operator Keyword
------------------------------------
Name StartsWith Ram
City Equals Chennai
My SQL table,
Name City CreatedDate
-----------------------------------
Ram Chennai 10/10/2014
Ramachan Kovai 02/03/2015
How can i loop thorough this TVP so that i can build the WHERE clause and can append it to the SELECT query which is faster since i have some 10 rows of search values(criteria).
The filters are associated with AND operator.
List of operators used:
Equals
Not equals
Starts with
Ends with
From(Date)
To(Date)

Answer 1

You can create a dynamic filtered expression like below and use it in your SQL. You need to be very careful when adding editing filters in your TVP and verifying it against respective datatypes as well
Create Type and Base Table with Data
/*
CREATE TYPE FilterTVP AS TABLE
(
ColumnName VARCHAR(30), Operator VARCHAR(30), Keyword VARCHAR(30)
);
GO
CREATE TABLE myTable
(
Name VARCHAR(50),
City VARCHAR(50),
CreatedDate DATE
)
INSERT INTO myTable VALUES('Ram','Chennai','10/10/2014'),('Ramachan','Kovai','02/03/2015')
*/
Query
DECLARE #Param FilterTVP
INSERT INTO #Param VALUES('Name','StartsWith','Ram'),('City','Equals','Chennai'),('CreatedDate','From','2014-05-05')
DECLARE #FilterExp NVARCHAR(MAX)
SELECT #FilterExp =
(SELECT
' AND ' + QUOTENAME(ColumnName,'[') + ' ' +
CASE Operator
WHEN 'Equals'
THEN '='
WHEN 'Not equals'
THEN '<>'
WHEN 'StartsWith'
THEN 'LIKE'
WHEN 'Endswith'
THEN 'LIKE'
WHEN 'From'
THEN '>='
WHEN 'To'
THEN '<='
END + ' ' +
CASE
WHEN Operator = 'Startswith' THEN QUOTENAME(Keyword + '%','''')
WHEN Operator = 'Endswith' THEN QUOTENAME('%' + Keyword ,'''')
ELSE QUOTENAME(Keyword,'''')
END
FROM #Param
FOR XML PATH(''),TYPE).value('.','NVARCHAR(MAX)')
SET #FilterExp = 'SELECT * FROM myTable WHERE 1=1 ' + ISNULL(#FilterExp,'')
PRINT #FilterExp
EXEC sp_executeSQL #FilterExp
Output
SQL Fiddle
Name City CreatedDate
--------------------------
Ram Chennai 2014-10-10

Answer 2

Build your statement and then execute it like for example:
CREATE TABLE f
(
ColumnName NVARCHAR(MAX) ,
Operator NVARCHAR(MAX) ,
KeyWord NVARCHAR(MAX)
)
CREATE TABLE t
(
Name NVARCHAR(MAX) ,
City NVARCHAR(MAX)
)
INSERT INTO f
VALUES ( 'Name', 'StartsWith', 'Ram' ),
( 'City', 'Equals', 'Chennai' )
INSERT INTO t
VALUES ( 'Ram', 'Chennai' ),
( 'Ramachan', 'Kovai' )
DECLARE #op NVARCHAR(MAX) ,
#v NVARCHAR(MAX)
DECLARE #statement NVARCHAR(MAX) = 'SELECT * FROM t WHERE Name '
SELECT #op = Operator ,
#v = KeyWord
FROM f
WHERE ColumnName = 'Name'
SET #statement = #statement + CASE #op
WHEN 'StartsWith' THEN 'LIKE ''' + #v + '%'''
ELSE ' = ''' + #v + ''''
END + ' AND City'
SELECT #op = Operator ,
#v = KeyWord
FROM f
WHERE ColumnName = 'City'
SET #statement = #statement + CASE #op
WHEN 'StartsWith' THEN 'LIKE ''%' + #v + '%'''
ELSE ' = ''' + #v + ''''
END
EXEC(#statement)
Output:
Name City
Ram Chennai