How to write a dynamic query for insert statement in sql server ?

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I want a dynamic insert query for insert data in table, I have 5 tables which have same column want a single query to insert data into tables.

I create sp

SQL

create proc insertdata
(
@tableName nvarchar(50),
@name nvarchar(50),
@Nrange nvarchar(50),
@isActive bit
)
as 
begin

declare @sql nvarchar(200)
set @sql = 'isert into '+@tableName +' values('+@name +','+@Nrange +','+@isActive +')';
exec(@sql)
end

like this but when try to execute it throws error

ERROR
------------

C#

Msg 402, Level 16, State 1, Procedure insertdata, Line 15
The data types nvarchar and bit are incompatible in the add operator.

Posted 6-Jan-16 0:07am

Dj@y

Updated 25-Feb-16 8:57am

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Comments

aarif moh shaikh 6-Jan-16 6:12am

check your insert spelling.

2 solutions

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Richard Deeming · Answer 1 · 2016-02-25T08:57:00

A perfect example of why stored procedures don't automatically protect you from SQL Injection[^]!

Use sp_executesql[^] to execute your query, passing the parameters as parameters. You also need to validate that the table name is a valid table in the current database.

SQL

CREATE PROC insertdata
(
    @tableName nvarchar(50),
    @name nvarchar(50),
    @Nrange nvarchar(50),
    @isActive bit
)
As 
BEGIN
DECLARE @sql nvarchar(max);
DECLARE @RealTableName sysname;
    
    SET NOCOUNT ON;
    
    SELECT
        @RealTableName = QUOTENAME(s.name) + '.' + QUOTENAME(t.name)
    FROM
        sys.tables As T
        INNER JOIN sys.schemas As S
        ON S.schema_id = T.schema_id
    WHERE
        T.name = @tableName
    ;
    
    If @@ROWCOUNT = 0 RAISERROR('Invalid table: "%s"', 16, 1, @tableName);

    SET @sql = N'INSERT INTO ' + @RealTableName + N' VALUES (@name, @Nrange, @isActive)';
    
    EXEC sp_executesql @sql, 
        N'@name nvarchar(50), @Nrange nvarchar(50), @isActive bit',
        @name = @name,
        @Nrange = @Nrange,
        @isActive = @isActive
    ;
END

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

*dan!sh* · Answer 2 · 2016-01-06T00:19:00

Solution 1

Your parameter @isActive is of type bit while rest of the command is nvarchar. You cannot use + operator between these two data types. You might want to convert the bit parameter to nvarchar to get this working.

Posted 6-Jan-16 0:19am

dan!sh

Comments

Dj@y 6-Jan-16 7:26am

after change data type sp is created
But afetr exicution of sp got error
error-----
Msg 2812, Level 16, State 62, Procedure insertdata, Line 17
Could not find stored procedure 'insert into tbltest2(Name,Nrange,isActive) values(test,3 - 5,1)'