Query not working with sqlite database

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I have a desktop application in which i have used c sharp with SQL server the below query fetches the data from the database when i am using the sql server as database but when i used sqlite database the below query does return nothing .tell me is there any different in writing inline queries in c sharp for sql and sqlite , or does the MAX or like function works differently in SQL and SQLITE below is my query.

C#

com.CommandText = "SELECT MAX(DocumentCode) AS DocumentCode FROM DocumentsHeader WHERE (DocumentCode LIKE @DocumentCode + '%')";
com.Parameters.Add("@DocumentCode", SqlDbType.NVarChar, 18).Value = Passvalue.ToString().Trim();
returnvalue = com.ExecuteScalar();

This query fetches record when using sql and when using sqlite it does nt fetching record while i check that my Db has the record .
any one can assists me ...

Posted 21-Oct-15 6:52am

Malikdanish

Updated 21-Oct-15 6:58am

phil.o

v4

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phil.o 21-Oct-15 12:58pm

What is the type of the com variable?

Malikdanish 21-Oct-15 13:21pm

com is a sqlite command type
com = new SQLiteCommand();

2 solutions

Solution 1

~~The MAX function does not work on non-numeric fields. Your DocumentCode field is apparently defined as nvarchar, which is non-numeric.~~

My bad. It DOES work with character fields. It would help if I verified with the documentation before speaking. I've never had occasion to use MAX on character data.

Posted 21-Oct-15 7:04am

Dave Kreskowiak

Updated 21-Oct-15 7:09am

v2

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Malikdanish 21-Oct-15 13:07pm

When I remove the where part it is pulling the data and fetching the data . mean while this Query works fine with SQL server having similar DB schema , Is there any problem with Like operator or using this wild cards character + '%' .. The Same query works fine in sql server i have both Db for test purposes i test with SQL it works fine.Is there any difference in Like operator between these Two Database ?

Dave Kreskowiak 21-Oct-15 13:13pm

I don't use SQLite so I can't comment on that.

Malikdanish 21-Oct-15 13:15pm

ok

Foothill 21-Oct-15 13:19pm

Try putting the wildcard character in your parameter value.

Foothill 21-Oct-15 13:23pm

com.CommandText = "SELECT MAX(DocumentCode) AS DocumentCode FROM DocumentsHeader WHERE (DocumentCode LIKE @DocumentCode)";
com.Parameters.Add("@DocumentCode", SqlDbType.NVarChar).Value = Passvalue.ToString().Trim() + "%";

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Foothill · Accepted Answer · 2015-10-21T07:43:00

You should alter your parameter code to include the SQL wildcard.

C#

com.Parameters.Add("@DocumentCode", SqlDbType.NVarChar).Value = Passvalue.ToString().Trim() + "%";

The reason that your SQL wasn't working is that this part of the query

C#

DocumentCode LIKE @DocumentCode + '%'

Becomes this SQL

SQL

DocumentCode LIKE 'DOCCODE' + '%'

The SQL becomes a string concatenation, not a value with a wildcard.