public void NullIf()
{
Person person = new Person();
Exception ex = Assert.Throws <InvalidOperationException>(() => SqlExp.NullIf(person.Name, "empty"));
Assert.Equal("Only for expressions.", ex.Message);
}
public void NullIf()
{
Person person = null;
IFunction func = (IFunction)sql.Val(() => SqlExp.NullIf(person.Name, "empty"));
QueryResult result = engine.Compile(func);
Assert.Equal("NULLIF(`person`.`Name`, @p0)", result.Sql);
Assert.Equal(new Dictionary <string, object>()
{
["@p0"] = "empty"
}, result.Parameters);
}