devart

问题 This is probably a really simple question, but here it is. I just renewed my license for the DevArt DBExpress driver for Firebird. The help file says I can use their freeware DBMonitor application with it but since I am using D2006, I have to use these instructions: "If you are Delphi Pro version user, then you don't have TSQLMonitor component installed on the palette, but it is included in SQLExpr.pas unit and you need to install it on the components palette manually." I can create an

问题 We migrated from oracle c12 to c19. And now we have simple test case that fails: //arrange string data = new string('x', 5000); var connection = tm.GetConnection(); var createTableCmd = connection.CreateCommand(false); createTableCmd.Text = "CREATE TABLE xx_temp (id NUMBER, text_long NCLOB, text_short NVARCHAR2(2000))"; createTableCmd.ExecuteNonQuery(); //act var insertCmd = connection.CreateCommand(false); insertCmd.Text = "INSERT INTO XX_TEMP (text_long) VALUES (@p1)"; var param = new

问题 We migrated from oracle c12 to c19. And now we have simple test case that fails: //arrange string data = new string('x', 5000); var connection = tm.GetConnection(); var createTableCmd = connection.CreateCommand(false); createTableCmd.Text = "CREATE TABLE xx_temp (id NUMBER, text_long NCLOB, text_short NVARCHAR2(2000))"; createTableCmd.ExecuteNonQuery(); //act var insertCmd = connection.CreateCommand(false); insertCmd.Text = "INSERT INTO XX_TEMP (text_long) VALUES (@p1)"; var param = new

问题 We migrated from oracle c12 to c19. And now we have simple test case that fails: //arrange string data = new string('x', 5000); var connection = tm.GetConnection(); var createTableCmd = connection.CreateCommand(false); createTableCmd.Text = "CREATE TABLE xx_temp (id NUMBER, text_long NCLOB, text_short NVARCHAR2(2000))"; createTableCmd.ExecuteNonQuery(); //act var insertCmd = connection.CreateCommand(false); insertCmd.Text = "INSERT INTO XX_TEMP (text_long) VALUES (@p1)"; var param = new

问题 I'm getting Nullable object must have a value after checking for null on a regular object, after a null check. I've found various questions, mostly regarding linq-to-sql, having the same problem but always with nullable primitive types (as in bool? or DateTime? ). The line causing the exception in my case looks like this: myDataContext.Orders.Where(y => customer.Address == null || (string.IsNullOrEmpty(customer.Address.Street) || y.Customers.Addresses.Street == customer.Address.Street)))

问题 I'm getting Nullable object must have a value after checking for null on a regular object, after a null check. I've found various questions, mostly regarding linq-to-sql, having the same problem but always with nullable primitive types (as in bool? or DateTime? ). The line causing the exception in my case looks like this: myDataContext.Orders.Where(y => customer.Address == null || (string.IsNullOrEmpty(customer.Address.Street) || y.Customers.Addresses.Street == customer.Address.Street)))

问题 I'm using an Oracle MERGE statement in dotConnect for Oracle, I know that the MERGE itself is fine as runs in P-Sql and SQL Developer, yet using the dotConnect and ExecuteNoQuery the query is apparently successful (no exceptions thrown) but the table has had no updates or inserts taken place. I can break the query into an Update and an Insert and they stick ok. Any Ideas ? 回答1: We have answered to you at our forum: http://forums.devart.com/viewtopic.php?f=1&t=29549 As a workaround, you can

问题 I'm using an Oracle MERGE statement in dotConnect for Oracle, I know that the MERGE itself is fine as runs in P-Sql and SQL Developer, yet using the dotConnect and ExecuteNoQuery the query is apparently successful (no exceptions thrown) but the table has had no updates or inserts taken place. I can break the query into an Update and an Insert and they stick ok. Any Ideas ? 回答1: We have answered to you at our forum: http://forums.devart.com/viewtopic.php?f=1&t=29549 As a workaround, you can

问题 I am interested in upgrading a suite of software from ODAC v5 to v8.2.8. One app in particular is causing problems. This application loads one of a set of secondary applications implemented as dlls. LibHandle := LoadLibrary(PChar(dllname)); if LibHandle <> 0 then begin @showForm := GetProcAddress(LibHandle,'ShowMainDllForm'); if (@showForm <> nil) then begin try ShowForm(Application.Handle, @FGlobalVars, 1); The launcher is fine - it has its own database connection, and I can step through the

问题 I'm using LINQ to Entities to display paged results. But I'm having issues with the combination of Skip() , Take() and OrderBy() calls. Everything works fine, except that OrderBy() is assigned too late. It's executed after result set has been cut down by Skip() and Take() . So each page of results has items in order. But ordering is done on a page handful of data instead of ordering of the whole set and then limiting those records with Skip() and Take() . How do I set precedence with these