带有Oracle的.NET（ODP.Net）-无数据

Question

We have 4 developers in my group and 2 of us can query Oracle data no problem from our .NET 3.5 asp.net webapp. But the other 2 get no results back, in the same exact query. In their case, if they replace the param with a hardcoded value, they get results back. For example:

select * from sometable where userid = :userid

(this works for 2 of us, but not the other 2)

select * from sometable where userid = '12345'

(this works for everyone)

We are all executing the same exact code, same exact query. Any idea why the parameterized query returns nothing for some of us?

Answer 1

I guarantee you that it has nothing to do with code. On two machines where it doesn't work you either have wrong data access components. Or, .NET sucks in references to completely wrong objects, which don't break the compilation time but they don't support bind variables. If you can, check which libraries are loaded into your domain object, it would be clear that you're loading completely wrong libraries.

Answer 2

With-out seeing the code, I think it could be a parameter type issue. Oracle is a PIA with parameters. I had issues with DateTime vs TimeStamp before. Oracle date parameter query not working?

Are you using specific Oracle types?

Are you passing in the same value types every time? or is one and int and another a double?

public IDbDataParameter CreateParameter(IDbCommand cmd, string name, DbType type) {
    OracleParameter p = (OracleParameter)cmd.CreateParameter();
    p.ParameterName = name;
    p.OracleDbType = DBTypeToOracle(type);
    if (p.OracleDbType == OracleDbType.TimeStampLTZ) {
        p.Precision = 3;

    }
    return p;
}