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166 | -----------------------------------------------------------------------
-- ado.schemas -- Database Schemas
-- Copyright (C) 2009, 2010, 2011, 2015, 2018, 2021 Stephane Carrez
-- Written by Stephane Carrez (Stephane.Carrez@gmail.com)
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
-----------------------------------------------------------------------
with ADO.Statements;
with ADO.Statements.Create;
with ADO.SQL;
with Ada.Strings.Fixed;
package body ADO.Schemas.Mysql is
use ADO.Statements;
procedure Load_Table_Schema (C : in ADO.Connections.Database_Connection'Class;
Table : in Table_Definition);
function String_To_Type (Value : in String) return Column_Type;
function String_To_Length (Value : in String) return Natural;
function String_To_Type (Value : in String) return Column_Type is
Pos : Natural;
begin
if Value = "date" then
return T_DATE;
elsif Value = "datetime" then
return T_DATE_TIME;
elsif Value = "int(11)" then
return T_INTEGER;
elsif Value = "bigint(20)" then
return T_LONG_INTEGER;
elsif Value = "tinyint(4)" then
return T_TINYINT;
elsif Value = "smallint(6)" then
return T_SMALLINT;
elsif Value = "longblob" then
return T_BLOB;
elsif Value = "float" then
return T_FLOAT;
elsif Value = "double" then
return T_DOUBLE;
end if;
Pos := Ada.Strings.Fixed.Index (Value, "(");
if Pos > 0 then
declare
Name : constant String := Value (Value'First .. Pos - 1);
begin
if Name = "varchar" then
return T_VARCHAR;
elsif Name = "decimal" then
return T_FLOAT;
elsif Name = "int" then
return T_INTEGER;
elsif Name = "bigint" then
return T_LONG_INTEGER;
else
return T_UNKNOWN;
end if;
end;
end if;
return T_UNKNOWN;
end String_To_Type;
function String_To_Length (Value : in String) return Natural is
First : Natural;
Last : Natural;
begin
First := Ada.Strings.Fixed.Index (Value, "(");
if First = 0 then
return 0;
end if;
Last := Ada.Strings.Fixed.Index (Value, ")");
if Last < First then
return 0;
end if;
return Natural'Value (Value (First + 1 .. Last - 1));
exception
when Constraint_Error =>
return 0;
end String_To_Length;
-- ------------------------------
-- Load the table definition
-- ------------------------------
procedure Load_Table_Schema (C : in ADO.Connections.Database_Connection'Class;
Table : in Table_Definition) is
Name : constant String := Get_Name (Table);
Stmt : Query_Statement
:= Create.Create_Statement (C.Create_Statement ("show full columns from "));
Last : Column_Definition := null;
Col : Column_Definition;
Value : Unbounded_String;
Query : constant ADO.SQL.Query_Access := Stmt.Get_Query;
begin
ADO.SQL.Append_Name (Target => Query.SQL, Name => Name);
Stmt.Execute;
while Stmt.Has_Elements loop
Col := new Column;
Col.Name := Stmt.Get_Unbounded_String (0);
if not Stmt.Is_Null (2) then
Col.Collation := Stmt.Get_Unbounded_String (2);
end if;
if not Stmt.Is_Null (5) then
Col.Default := Stmt.Get_Unbounded_String (5);
end if;
if Last /= null then
Last.Next_Column := Col;
else
Table.First_Column := Col;
end if;
Value := Stmt.Get_Unbounded_String (1);
Col.Col_Type := String_To_Type (To_String (Value));
Col.Size := String_To_Length (To_String (Value));
Value := Stmt.Get_Unbounded_String (3);
Col.Is_Null := Value = "YES";
Value := Stmt.Get_Unbounded_String (4);
Col.Is_Primary := Value = "PRI";
Last := Col;
Stmt.Next;
end loop;
end Load_Table_Schema;
-- ------------------------------
-- Load the database schema
-- ------------------------------
procedure Load_Schema (C : in ADO.Connections.Database_Connection'Class;
Schema : out Schema_Definition) is
Stmt : Query_Statement
:= Create.Create_Statement (C.Create_Statement ("show tables"));
Table : Table_Definition;
Last : Table_Definition := null;
begin
Schema.Schema := new ADO.Schemas.Schema;
Stmt.Execute;
while Stmt.Has_Elements loop
Table := new ADO.Schemas.Table;
Table.Name := Stmt.Get_Unbounded_String (0);
if Last /= null then
Last.Next_Table := Table;
else
Schema.Schema.First_Table := Table;
end if;
Load_Table_Schema (C, Table);
Last := Table;
Stmt.Next;
end loop;
end Load_Schema;
end ADO.Schemas.Mysql;
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