Add Step, and Column functions

Source/Impl/sqlite.adb

@@ -1,4 +1,6 @@
+with System;
 with Ada.Text_IO; use Ada.Text_IO;
+with Ada.Exceptions; use Ada.Exceptions;
 
 with Interfaces.C; use Interfaces.C;
 with Interfaces.C.Strings; use Interfaces.C.Strings;
@@ -7,25 +9,75 @@ with Ada.Unchecked_Conversion;
 
 package body Sqlite is
 
-   procedure Finalize (Db : in out Database) is
+   procedure Close (Stmt : in out Statement) is
 
-      function sqlite3_close (Db : in out Database_Int) return Int
+      function sqlite3_finalize (Stmt : not null Statement_Int) return Error_Codes
          with Import, Convention => C;
 
-      function sqlite3_close_v2 (Db : in out Database_Int) return Int
-         with Import, Convention => C;
-
-      Error : int := 0;
+      Error : Error_Codes := sqlite3_finalize (Stmt.Internal);
 
    begin
 
-      if Db.Version = v1 then
-         Error := sqlite3_close (Db.Internal);
-      else
-         Error := sqlite3_close_v2 (Db.Internal);
+      Stmt.Internal := null;
+
+   end Close;
+
+   function Step (Stmt : in out Statement) return Statement_Status
+   is
+
+      function sqlite3_step (Stmt : not null Statement_Int) return Error_Codes
+         with Import, Convention => C;
+
+   begin
+
+      if Stmt.Internal = null then
+         raise Allocation_Error with "Statement already finalized";
       end if;
 
-   end Finalize;
+      case sqlite3_step(Stmt.Internal) is
+         when 5 =>
+            return Busy;
+         when 100 =>
+            return Row;
+         when 101 =>
+            return Done;
+         when others =>
+            raise Program_Error;
+      end case;
+
+   end Step;
+
+   function Column (Stmt : in out Statement; Col : Int) return Int
+   is
+
+      function sqlite3_column_int (
+         Stmt : not null Statement_Int;
+         iCol : Int) return Int
+         with Import, Convention => C;
+
+   begin
+
+      return sqlite3_column_int(Stmt.Internal, Col);
+      
+   end Column;
+
+   function Column (Stmt : in out Statement; Col : Int) return String
+   is
+
+      function sqlite3_column_text (
+         Stmt : not null Statement_Int;
+         iCol : Int) return Chars_Ptr
+         with Import, Convention => C;
+
+      Data : Chars_Ptr;
+
+   begin
+
+      Data := sqlite3_column_text(Stmt.Internal, Col);
+
+      return Value(Data);
+
+   end Column;
 
    procedure Open (Db : in out Database; Filename : String) is
 
@@ -101,8 +153,6 @@ package body Sqlite is
             Flags.Open_PrivateCache := True;
       end case;
 
-      Put_Line (Convert (Flags)'Image);
-
       Error := sqlite3_open_v2 (
          New_String (Filename),
          Db.Internal,
@@ -112,9 +162,67 @@ package body Sqlite is
       Db.Version := v2;
    end Open;
 
-   procedure Close (Db : in out Database) is
+   function Prepare (
+      Db : in out Database'Class;
+      SQL_Statement : String ) return Statement
+   is
+
+      function sqlite3_prepare_v2 (
+         Db : Database_Int;
+         zSql : Chars_Ptr;
+         nByte : Int;
+         ppStmt : out Statement_Int;
+         pzTail : System.Address ) return Int
+         with Import, Convention => C;
+
+      Error : Int;
+      Stmt_Int : Statement_Int;
+      Stmt : Statement;
+
    begin
-      Db.Finalize;
+
+      Error := sqlite3_prepare_v2 (
+         Db.Internal,
+         New_String (SQL_Statement),
+         Int (SQL_Statement'Length),
+         Stmt_Int,
+         System.Null_Address);
+
+      if Stmt_Int = null then
+         Put_Line("Statement is null");
+      end if;
+
+      if Error = 0 then
+         Put_Line("Statement is prepared");
+      else
+         Put_Line("Error " & Error'Image);
+      end if;
+
+      Stmt.Internal := Stmt_Int;
+
+      return Stmt;
+
+   end Prepare;
+
+   procedure Close (Db : in out Database) is
+
+      function sqlite3_close (Db : not null Database_Int) return Int
+         with Import, Convention => C;
+
+      function sqlite3_close_v2 (Db : not null Database_Int) return Int
+         with Import, Convention => C;
+
+      Error : Int;
+
+   begin
+
+      if Db.Version = v1 then
+         Error := sqlite3_close (Db.Internal);
+      else
+         Error := sqlite3_close_v2 (Db.Internal);
+      end if;
+
+      Db.Internal := null;
    end Close;
 
 end Sqlite;