SQL SELECT FROM WHERE CLAUSE

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SQL-Server-2008

I can not find a WORKING example using a variable data element in the sql select from where clause.

example select * from table where fielda = "123" is not what I want to do.

string myselection = "123";

select * from table where fielda = myselection is what I want

I am using C# and visual studio 2008 and sql server 2008.

thanks.

[email removed for your protection]

[Modified: First, I added the C# tag...second, I removed your email...if someone posts a response to this, you'll get an email...posting your email only servers to help spammers know where to send stuff]

Posted 30-Mar-10 10:22am

TOMLRICE

Updated 30-Mar-10 10:41am

William Winner

v2

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Sandeep Mewara · Answer 1 · 2010-03-30T19:26:00

Solution 3

One simpler method for it looks like you need:

SQL

SET @mySelection = '123'
SELECT * FROM myTable WHERE fielda = @mySelection

Posted 30-Mar-10 19:26pm

Sandeep Mewara

William Winner · Answer 2 · 2010-03-30T10:37:00

ok...so do

C#

string SQL = "SELECT * FROM table WHERE fielda='" & myselection & "';"

or

C#

SqlCommand nonqueryCommand = thisConnection.CreateCommand();

nonqueryCommand.CommandText = "SELECT * FROM table WHERE fielda=@fielda;";
nonqueryCommand.Parameters.Add("@fielda", SqlDbType.VarChar, 30);

[Updated: sorry, I missed a parameter in the Add. It should read

C#

nonqueryCommand.Parameters.Add("@fielda",SqlDbType.Int).Value = 123;
//or something similar

And what's with the downvoting?]

mhwasim · Answer 3 · 2011-05-18T05:58:00

Solution 4

Use this

string SQL = @"SELECT * FROM table WHERE fielda='" + myselection + "'"

This sould work....

Posted 18-May-11 5:58am

mhwasim

TOMLRICE · Answer 4 · 2010-03-30T14:06:00

select * from table where fielda = '" & myselection & "' ";

generates the following error that I can not get rid of.

field initializer cannot reference the non-static field, method, or property 'Client_Maintenance.AddressLoad.myselection' C:\TARE SYSTEM\Client Maintenance\AddressLoad.cs 49 164 Client Maintenance

I appreciate your help.

fcronin · Answer 5 · 2011-05-18T11:59:00

Solution 5

string myselection = "123";

// fielda is char,varchar,nvarchar,etc...
string SQL = String.Format("select * from table where fielda = '{0}'", myselection); 

// fielda is numeric...
string SQL = String.Format("select * from table where fielda = {0};", myselection);

Posted 18-May-11 11:59am

fcronin

Comments

Member 13353325 3-Oct-17 9:50am

how to pass multiple string variable in '" format in sql where clouse