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516 | -----------------------------------------------------------------------
-- ado-connections-mysql -- MySQL Database connections
-- Copyright (C) 2009, 2010, 2011, 2012, 2013, 2015, 2017, 2018, 2019 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 Ada.Task_Identification;
with Ada.Directories;
with Interfaces.C.Strings;
with Util.Log;
with Util.Log.Loggers;
with Util.Properties;
with Util.Processes.Tools;
with ADO.Sessions.Sources;
with ADO.Sessions.Factory;
with ADO.Statements.Mysql;
with ADO.Schemas.Mysql;
with ADO.Parameters;
with ADO.Queries;
with ADO.C;
with Mysql.Lib; use Mysql.Lib;
package body ADO.Connections.Mysql is
use ADO.Statements.Mysql;
use Util.Log;
use Interfaces.C;
pragma Linker_Options (MYSQL_LIB_NAME);
Log : constant Loggers.Logger := Loggers.Create ("ADO.Databases.Mysql");
Driver_Name : aliased constant String := "mysql";
Driver : aliased Mysql_Driver;
-- ------------------------------
-- Get the database driver which manages this connection.
-- ------------------------------
overriding
function Get_Driver (Database : in Database_Connection)
return ADO.Connections.Driver_Access is
pragma Unreferenced (Database);
begin
return Driver'Access;
end Get_Driver;
overriding
function Create_Statement (Database : in Database_Connection;
Table : in ADO.Schemas.Class_Mapping_Access)
return Query_Statement_Access is
begin
return Create_Statement (Database => Database.Server, Table => Table);
end Create_Statement;
overriding
function Create_Statement (Database : in Database_Connection;
Query : in String)
return Query_Statement_Access is
begin
return Create_Statement (Database => Database.Server, Query => Query);
end Create_Statement;
-- ------------------------------
-- Create a delete statement.
-- ------------------------------
overriding
function Create_Statement (Database : in Database_Connection;
Table : in ADO.Schemas.Class_Mapping_Access)
return Delete_Statement_Access is
begin
return Create_Statement (Database => Database.Server, Table => Table);
end Create_Statement;
-- ------------------------------
-- Create an insert statement.
-- ------------------------------
overriding
function Create_Statement (Database : in Database_Connection;
Table : in ADO.Schemas.Class_Mapping_Access)
return Insert_Statement_Access is
begin
return Create_Statement (Database => Database.Server, Table => Table);
end Create_Statement;
-- ------------------------------
-- Create an update statement.
-- ------------------------------
overriding
function Create_Statement (Database : in Database_Connection;
Table : in ADO.Schemas.Class_Mapping_Access)
return Update_Statement_Access is
begin
return Create_Statement (Database => Database.Server, Table => Table);
end Create_Statement;
-- ------------------------------
-- Start a transaction.
-- ------------------------------
overriding
procedure Begin_Transaction (Database : in out Database_Connection) is
begin
if Database.Autocommit then
Database.Execute ("set autocommit=0");
Database.Autocommit := False;
end if;
Database.Execute ("start transaction;");
end Begin_Transaction;
-- ------------------------------
-- Commit the current transaction.
-- ------------------------------
overriding
procedure Commit (Database : in out Database_Connection) is
Result : char;
begin
if Database.Server = null then
Log.Warn ("Commit while the connection is closed");
raise ADO.Sessions.Session_Error with "Database connection is closed";
end if;
Result := mysql_commit (Database.Server);
if Result /= nul then
raise Database_Error with "Cannot commit transaction";
end if;
end Commit;
-- ------------------------------
-- Rollback the current transaction.
-- ------------------------------
overriding
procedure Rollback (Database : in out Database_Connection) is
Result : char;
begin
if Database.Server = null then
Log.Warn ("Rollback while the connection is closed");
raise ADO.Sessions.Session_Error with "Database connection is closed";
end if;
Result := mysql_rollback (Database.Server);
if Result /= nul then
raise Database_Error with "Cannot rollback transaction";
end if;
end Rollback;
-- ------------------------------
-- Load the database schema definition for the current database.
-- ------------------------------
overriding
procedure Load_Schema (Database : in Database_Connection;
Schema : out ADO.Schemas.Schema_Definition) is
begin
ADO.Schemas.Mysql.Load_Schema (Database, Schema);
end Load_Schema;
-- ------------------------------
-- Execute a simple SQL statement
-- ------------------------------
procedure Execute (Database : in out Database_Connection;
SQL : in Query_String) is
SQL_Stat : constant ADO.C.String_Ptr := ADO.C.To_String_Ptr (SQL);
Result : int;
begin
Log.Debug ("Execute SQL: {0}", SQL);
if Database.Server = null then
Log.Warn ("Database connection is not open");
raise ADO.Sessions.Session_Error with "Database connection is closed";
end if;
Result := Mysql_Query (Database.Server, ADO.C.To_C (SQL_Stat));
if Result /= 0 then
declare
Error : constant Strings.chars_ptr := Mysql_Error (Database.Server);
Msg : constant String := Strings.Value (Error);
begin
Log.Error ("Error: {0}", Msg);
raise ADO.Statements.SQL_Error with "SQL error: " & Msg;
end;
end if;
end Execute;
-- ------------------------------
-- Closes the database connection
-- ------------------------------
overriding
procedure Close (Database : in out Database_Connection) is
begin
if Database.Server /= null then
Log.Info ("Closing connection {0}/{1}", Database.Name, Database.Ident);
mysql_close (Database.Server);
Database.Server := null;
end if;
end Close;
-- ------------------------------
-- Releases the mysql connection if it is open
-- ------------------------------
overriding
procedure Finalize (Database : in out Database_Connection) is
begin
Log.Debug ("Release connection {0}/{1}", Database.Name, Database.Ident);
Database.Close;
end Finalize;
-- ------------------------------
-- Initialize the database connection manager.
--
-- mysql://localhost:3306/db
--
-- ------------------------------
procedure Create_Connection (D : in out Mysql_Driver;
Config : in Configuration'Class;
Result : in out Ref.Ref'Class) is
Host : constant ADO.C.String_Ptr := ADO.C.To_String_Ptr (Config.Get_Server);
Name : constant ADO.C.String_Ptr := ADO.C.To_String_Ptr (Config.Get_Database);
Login : constant ADO.C.String_Ptr := ADO.C.To_String_Ptr (Config.Get_Property ("user"));
Password : constant ADO.C.String_Ptr := C.To_String_Ptr (Config.Get_Property ("password"));
Socket : ADO.C.String_Ptr;
Port : unsigned := unsigned (Config.Get_Port);
Flags : constant unsigned_long := 0;
Connection : Mysql_Access;
Socket_Path : constant String := Config.Get_Property ("socket");
Server : Mysql_Access;
begin
if Socket_Path /= "" then
ADO.C.Set_String (Socket, Socket_Path);
end if;
if Port = 0 then
Port := 3306;
end if;
Log.Info ("Task {0} connecting to {1}:{2}",
Ada.Task_Identification.Image (Ada.Task_Identification.Current_Task),
Config.Get_Server, Config.Get_Database);
if Config.Get_Property ("password") = "" then
Log.Debug ("MySQL connection with user={0}", Config.Get_Property ("user"));
else
Log.Debug ("MySQL connection with user={0} password=XXXXXXXX",
Config.Get_Property ("user"));
end if;
Connection := mysql_init (null);
Server := mysql_real_connect (Connection, ADO.C.To_C (Host),
ADO.C.To_C (Login), ADO.C.To_C (Password),
ADO.C.To_C (Name), Port, ADO.C.To_C (Socket), Flags);
if Server = null then
declare
Message : constant String := Strings.Value (Mysql_Error (Connection));
begin
Log.Error ("Cannot connect to '{0}': {1}", Config.Get_Log_URI, Message);
mysql_close (Connection);
raise ADO.Configs.Connection_Error with "Cannot connect to mysql server: " & Message;
end;
end if;
D.Id := D.Id + 1;
declare
Ident : constant String := Util.Strings.Image (D.Id);
Database : constant Database_Connection_Access := new Database_Connection;
procedure Configure (Name : in String;
Item : in Util.Properties.Value);
function Is_Number (Value : in String) return Boolean is
(for all C of Value => C >= '0' and C <= '9');
procedure Configure (Name : in String;
Item : in Util.Properties.Value) is
Value : constant String := Util.Properties.To_String (Item);
begin
if Name = "encoding" then
Database.Execute ("SET NAMES " & Value);
Database.Execute ("SET CHARACTER SET " & Value);
Database.Execute ("SET CHARACTER_SET_SERVER = '" & Value & "'");
Database.Execute ("SET CHARACTER_SET_DATABASE = '" & Value & "'");
elsif Util.Strings.Index (Name, '.') = 0
and Name /= "user" and Name /= "password" and Name /= "socket"
then
if Is_Number (Value) then
Database.Execute ("SET " & Name & "=" & Value);
else
Database.Execute ("SET " & Name & "='" & Value & "'");
end if;
end if;
end Configure;
begin
Database.Ident (1 .. Ident'Length) := Ident;
Database.Server := Server;
Database.Name := To_Unbounded_String (Config.Get_Database);
-- Configure the connection by setting up the MySQL 'SET X=Y' SQL commands.
-- Typical configuration includes:
-- encoding=utf8
-- collation_connection=utf8_general_ci
Config.Iterate (Process => Configure'Access);
Result := Ref.Create (Database.all'Access);
end;
end Create_Connection;
-- ------------------------------
-- Create the database and initialize it with the schema SQL file.
-- The `Admin` parameter describes the database connection with administrator access.
-- The `Config` parameter describes the target database connection.
-- ------------------------------
overriding
procedure Create_Database (D : in out Mysql_Driver;
Admin : in Configs.Configuration'Class;
Config : in Configs.Configuration'Class;
Schema_Path : in String;
Messages : out Util.Strings.Vectors.Vector) is
pragma Unreferenced (D);
-- Create the MySQL tables in the database. The tables are created by launching
-- the external command 'mysql' and using the create-xxx-mysql.sql generated scripts.
procedure Create_Mysql_Tables (Path : in String;
Config : in Configs.Configuration'Class);
-- Create the database identified by the given name.
procedure Create_Database (DB : in ADO.Sessions.Master_Session;
Name : in String);
-- Create the user and grant him access to the database.
procedure Create_User_Grant (DB : in ADO.Sessions.Master_Session;
Name : in String;
User : in String;
Password : in String);
-- ------------------------------
-- Check if the database with the given name exists.
-- ------------------------------
function Has_Database (DB : in ADO.Sessions.Session'Class;
Name : in String) return Boolean is
Stmt : ADO.Statements.Query_Statement;
begin
Stmt := DB.Create_Statement ("SHOW DATABASES");
Stmt.Execute;
while Stmt.Has_Elements loop
declare
D : constant String := Stmt.Get_String (0);
begin
if Name = D then
return True;
end if;
end;
Stmt.Next;
end loop;
return False;
end Has_Database;
-- ------------------------------
-- Check if the database with the given name has some tables.
-- ------------------------------
function Has_Tables (DB : in ADO.Sessions.Session'Class;
Name : in String) return Boolean is
Stmt : ADO.Statements.Query_Statement;
begin
Stmt := DB.Create_Statement ("SHOW TABLES FROM `:name`");
Stmt.Bind_Param ("name", ADO.Parameters.Token (Name));
Stmt.Execute;
return Stmt.Has_Elements;
end Has_Tables;
-- ------------------------------
-- Create the database identified by the given name.
-- ------------------------------
procedure Create_Database (DB : in ADO.Sessions.Master_Session;
Name : in String) is
Stmt : ADO.Statements.Query_Statement;
begin
Log.Info ("Creating database '{0}'", Name);
Stmt := DB.Create_Statement ("CREATE DATABASE `:name`");
Stmt.Bind_Param ("name", ADO.Parameters.Token (Name));
Stmt.Execute;
end Create_Database;
-- ------------------------------
-- Create the user and grant him access to the database.
-- ------------------------------
procedure Create_User_Grant (DB : in ADO.Sessions.Master_Session;
Name : in String;
User : in String;
Password : in String) is
Query : ADO.Queries.Context;
Stmt : ADO.Statements.Query_Statement;
begin
Log.Info ("Granting access for user '{0}' to database '{1}'", User, Name);
if Password'Length > 0 then
Query.Set_SQL ("GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, "
& "CREATE TEMPORARY TABLES, EXECUTE, SHOW VIEW ON "
& "`:name`.* to `:user`@'localhost' IDENTIFIED BY :password");
else
Query.Set_SQL ("GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, "
& "CREATE TEMPORARY TABLES, EXECUTE, SHOW VIEW ON "
& "`:name`.* to `:user`@'localhost'");
end if;
Stmt := DB.Create_Statement (Query);
Stmt.Bind_Param ("name", ADO.Parameters.Token (Name));
Stmt.Bind_Param ("user", ADO.Parameters.Token (User));
if Password'Length > 0 then
Stmt.Bind_Param ("password", Password);
end if;
Stmt.Execute;
Stmt := DB.Create_Statement ("FLUSH PRIVILEGES");
Stmt.Execute;
end Create_User_Grant;
-- ------------------------------
-- Create the MySQL tables in the database. The tables are created by launching
-- the external command 'mysql' and using the create-xxx-mysql.sql generated scripts.
-- ------------------------------
procedure Create_Mysql_Tables (Path : in String;
Config : in Configs.Configuration'Class) is
Database : constant String := Config.Get_Database;
Username : constant String := Config.Get_Property ("user");
Password : constant String := Config.Get_Property ("password");
Status : Integer;
begin
Log.Info ("Creating database tables using schema '{0}'", Path);
if not Ada.Directories.Exists (Path) then
Log.Error ("SQL file '{0}' does not exist.", Path);
Log.Error ("Please, run the following command: dynamo generate db");
return;
end if;
if Password'Length > 0 then
Util.Processes.Tools.Execute ("mysql --user='" & Username & "' --password='"
& Password & "' "
& Database, Path, Messages, Status);
else
Util.Processes.Tools.Execute ("mysql --user='" & Username & "' "
& Database, Path, Messages, Status);
end if;
end Create_Mysql_Tables;
Factory : ADO.Sessions.Factory.Session_Factory;
begin
Log.Info ("Connecting to {0} for database setup", Admin.Get_Log_URI);
-- Initialize the session factory to connect to the
-- database defined by root connection (which should allow the database creation).
Factory.Create (ADO.Sessions.Sources.Data_Source (Admin));
declare
DB : constant ADO.Sessions.Master_Session := Factory.Get_Master_Session;
begin
-- Create the database only if it does not already exists.
if not Has_Database (DB, Config.Get_Database) then
Create_Database (DB, Config.Get_Database);
end if;
-- If some tables exist, don't try to create tables again.
-- We could improve by reading the current database schema, comparing with our
-- schema and create what is missing (new tables, new columns).
if Has_Tables (DB, Config.Get_Database) then
Log.Error ("The database {0} exists", Config.Get_Database);
else
if "" /= Config.Get_Property ("user") then
-- Create the user grant. On MySQL, it is safe to do this several times.
Create_User_Grant (DB, Config.Get_Database,
Config.Get_Property ("user"),
Config.Get_Property ("password"));
end if;
-- And now create the tables by using the SQL script.
Create_Mysql_Tables (Schema_Path, Config);
end if;
end;
end Create_Database;
-- ------------------------------
-- Initialize the Mysql driver.
-- ------------------------------
procedure Initialize is
use type Util.Strings.Name_Access;
begin
Log.Debug ("Initializing mysql driver");
if Driver.Name = null then
Driver.Name := Driver_Name'Access;
Register (Driver'Access);
end if;
end Initialize;
-- ------------------------------
-- Deletes the Mysql driver.
-- ------------------------------
overriding
procedure Finalize (D : in out Mysql_Driver) is
pragma Unreferenced (D);
begin
Log.Debug ("Deleting the mysql driver");
mysql_server_end;
end Finalize;
end ADO.Connections.Mysql;
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