A stable solution for working with amysql database (reading and writing information) - MQL4 and MetaTrader 4

Alexander 2009.07.02 19:06 #41

Try this:

#import "MT4"
int SaveSQL( int x,int y);  
#import

void start()
{
   int rez= SaveSQL(10,2);
   Comment("Результат"+ rez);
}

Serge 2009.07.02 21:18 #42

A stable solution for working with a mysql database (reading and writing information). Mysql_wrapper keeps crashing the terminal.

Alexander 2009.07.02 21:57 #43

BTRVODKAex

For this purpose an intermediate dll in c++\cli is written. You cannot call managed code from mql directly

Nefedov Kirill 2009.07.03 05:02 #44

Graff >> :
What is a stable solution for working with mysql database (reading and writing information)? Mysql_wrapper keeps crashing the terminal.

https://www.mql5.com/ru/code/8623

Serge 2009.07.03 10:39 #45

HIDDEN >> :

https://www.mql5.com/ru/code/8623

When using mysql_wrapper the terminal crashes. is there any way to fix it? i've tested on HP and 7 build 7100 - the problems are the same.

Log:

There has been a critical error
Time : 2009.07.03 13:38
Program : Client Terminal
Version : 4.00 (build: 224, 15 May 2009)
OS : Windows XP Professional 5.1 Service Pack 3 (Build 2600)
Processors : 2 x X86 (level 6)
Memory : 2086128/291388 kb
Exception : C0000005
Address : 7C929267
Access Type : read
Access Addr : 00000004

Registers : EAX=0000000000 CS=001b EIP=7C929267 EFLGS=00010217
: EBX=000000000000 SS=0023 ESP=0012DD60 EBP=0012DE1C
: ECX=022F8900 DS=0023 ESI=022F88F0 FS=003b
: EDX=022F8910 ES=0023 EDI=00340000 GS=0000

Stack Trace : 77C1C2DE 0055ED21 00000000 00000000
: 00000000 00000000 00000000 00000000
: 00000000 00000000 00000000 00000000
: 00000000 00000000 00000000 00000000

Modules :
1 : 00400000 002B1000 d:\forex\metatrader - alpari\terminal.exe
2 : 00F70000 00042000 c:program files\splitview 2009\splat.dll
3 : 018F0000 002CD000 c:{windows\system32\xpsp2res.dll
4 : 02050000 00035000 d:\forex\metatrader - alpari\experts\libraries\mysql_wrapper.dll
5 : 02090000 00244000 c:{windows\system32\libmysql.dll
6 : 02560000 00009000 c:{windows\system32\amhooker.dll
7 : 08000000 00008000 c:{program files\yandex\punto switcher\pshook.dll
8 : 10000000 00012000 c:{program files\rocketdock\rocketdock.dll
9 : 40080000 001E8000 c:windows\system32\iertutil.dll
10 : 45020000 00131000 c:\windows\system32\urlmon.dll
11 : 5B260000 00038000 c:\windows\system32/uxtheme.dll
12 : 5BD50000 00056000 c:{windows\system32/netapi32.dll
13 : 61EC0000 0000E000 c:{windows\system32\mfc42loc.dll
14 : 698B0000 00058000 c:{windows\system32\hnetcfg.dll
15 : 71A30000 00040000 c:{windows\system32\mswsock.dll
16 : 71A70000 00008000 c:{windows\system32\wshtcpip.dll
17 : 71A80000 00008000 c:{windows\system32\ws2help.dll
18 : 71A90000 00017000 c:{windows\system32\ws2_32.dll
19 : 71AB0000 0000A000 c:{windows\system32\wsock32.dll
20 : 72CD0000 00008000 c:{windows\system32\msacm32.drv
21 : 72CE0000 00009000 c:{windows\system32\wdmaud.drv
22 : 73D90000 000FE000 c:{windows\system32\mfc42.dll
23 : 746E0000 0004C000 c:\windows\system32\msctf.dll
24 : 75310000 0002E000 c:{windows\system32\msctfime.ime
25 : 76350000 00005000 c:{windows\system32\msimg32.dll
26 : 76360000 0001D000 c:\windows\system32\imm32.dll
27 : 76380000 00049000 c:{windows\system32\comdlg32.dll
28 : 76B20000 0002E000 c:\windows\system32\winmm.dll
29 : 76BE0000 0000B000 c:{windows\system32\psapi.dll
30 : 76C20000 0002E000 c:{windows\system32\wintrust.dll
31 : 76C80000 00028000 c:{windows\system32\imagehlp.dll
32 : 76F10000 00027000 c:{windows\system32\dnsapi.dll
33 : 76F50000 0002D000 c:{windows\system32\wldap32.dll
34 : 76FA0000 00008000 c:{windows\system32\winrnr.dll
35 : 76FB0000 00006000 c:{windows\system32\rasadhlp.dll
36 : 76FC0000 0007F000 c:{windows\system32\clbcatq.dll
37 : 77040000 000C7000 c:\windows\system32\comres.dll
38 : 77110000 0008B000 c:{windows\system32/oleaut32.dll
39 : 773C0000 00103000 c:\windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.2600.5512_x-ww_35d4ce83\comctl32.dll
40 : 774D0000 0013E000 c:\windows\system32\ole32.dll
41 : 77910000 000F4000 c:{windows\system32/setupapi.dll
42 : 77A70000 00096000 c:{windows\system32\crypt32.dll
43 : 77B10000 00012000 c:{windows\system32/msasn1.dll
44 : 77B30000 00022000 c:{windows\system32/apphelp.dll
45 : 77BC0000 00007000 c:{windows\system32\midimap.dll
46 : 77BD0000 00015000 c:{windows\system32\msacm32.dll
47 : 77BF0000 00008000 c:{windows\system32/version.dll
48 : 77C00000 00058000 c:{windows\system32\msvcrt.dll
49 : 77DC0000 000AC000 c:{windows\system32\advapi32.dll
50 : 77E70000 00092000 c:{windows\system32\rpcrt4.dll
51 : 77F10000 00049000 c:{windows\system32\gdi32.dll
52 : 77F60000 00076000 c:{windows\system32\shlwapi.dll
53 : 77FE0000 00011000 c:{windows\system32\secur32.dll
54 : 7C800000 000F8000 c:{windows\system32/kernel32.dll
55 : 7C900000 000B3000 c:{windows\system32/ntdll.dll
56 : 7C9C0000 0081B000 c:{windows\system32\shell32.dll
57 : 7E360000 00091000 c:{windows\system32\user32.dll

Call stack :

Initial deposit size - A quick and free strange... and monstrous.

kombat 2009.07.03 13:16 #46

What's wrong with using libmysql.dll?

It writes to the database perfectly, I haven't tried to read it, but I'm guessing it's not buggy either.

Serge 2009.07.03 13:37 #47

kombat >> :

What's wrong with using libmysql.dll?

Writes to the database perfectly, didn't try to read, but I assume also without faults.

For me, reading from the database is more important. If anyone has verified code for reading from the database with libmysql.dll please send it to me.

Here googled the code to read from the base via libmysql.dll:

//+------------------------------------------------------------------+
//|                                                      news001.mq4 |
//|                                          Copyright © 2009, Graff |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2009, Graff"
#property link      ""

#property indicator_chart_window

#define DELIM ";" 
//#include <mysql.mqh> 

#import "libmysql.dll" 
int mysql_init(int db); 
int mysql_errno(int TMYSQL); 
int mysql_real_connect( int TMYSQL,string host,string user,string password, string DB,int port,int socket,int clientflag); 
int mysql_real_query(int TMSQL,string query,int length); 
void mysql_close(int TMSQL); 

int mysql_store_result(int TMSQL); 
string mysql_fetch_row(int result); 
int mysql_num_rows(int result); 
void mysql_free_result(int result); 

//#import 

int mysql; 

int mTicket, mType; 
string mSymbol; 
double mLots, mOpen, mClose, mStopLoss, mTakeProfit;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   string row; 
   connect(); 
   string query="Select currency, title from calendar WHERE currency = 'USD'"; 
   int length=StringLen( query); 
   mysql_real_query( mysql, query, length); 
   int result = mysql_store_result( mysql); 
   int numOfRows = mysql_num_rows( result); 
   for (int i=0; i< numOfRows; i++) { 
      row = mysql_fetch_row( result); 
      Print( row); 
      //Print("Ticket=", mTicket, ",Symbol=", mSymbol);
     // decodeTrade(row); 
      //Comment("Ticket=", mTicket, ",Symbol=", mSymbol, ",Type=", mType, ",Lots=", mLots, ",Open=", mOpen, ",Close=", mClose, ",SL=", mStopLoss, ",TakeProfit=", mTakeProfit); 
   } 
   mysql_free_result( result);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
 mysql_close( mysql);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+

void connect() { 

   mysql = mysql_init( mysql); 
   if ( mysql!=0) Print("allocated"); 
   string host="localhost"; 
   string user="*****"; 
   string password="****"; 
   string DB="forex"; 
   int clientflag=0; 
   int port=3306; 
   string socket=""; 
   int res= mysql_real_connect( mysql, host, user, password, DB, port, socket, clientflag); 
   int err=GetLastError(); 
   if ( res== mysql) Print("connected"); 
   else Print("error=", mysql," ", mysql_errno( mysql)," "); 

} 

void decodeTrade(string trade) { 
   int begin = StringFind( trade, DELIM)+1; 
   int end = StringFind( trade, DELIM, begin); 
   mTicket = StrToInteger(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mSymbol = StringSubstr( trade, begin, end- begin); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mType = StrToInteger(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mLots = StrToDouble(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mOpen = StrToDouble(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mClose = StrToDouble(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringFind( trade, DELIM, begin); 
   mStopLoss = StrToDouble(StringSubstr( trade, begin, end- begin)); 
   begin = end+1; 
   end = StringLen( trade); 
   mTakeProfit = StrToDouble(StringSubstr( trade, begin, end- begin)); 
}

Result of its execution:

18:01:54 Compiling 'news001'
18:01:54 news001 USDCHF,H4: deinitialized
18:01:54 news001 USDCHF,H4: uninit reason 2
18:01:54 news001 USDCHF,H4: loaded successfully
18:01:54 news001 USDCHF,H4: allocated
18:01:54 news001 USDCHF,H4: connected
18:01:54 news001 USDCHF,H4: ¤FџYOFџ°FџUSD
18:01:54 news001 USDCHF,H4: MFџPFџnFџUSD
18:01:54 news001 USDCHF,H4: GџGџ$GџUSD
18:01:54 news001 USDCHF,H4: DGџHGџ_GџUSD
18:01:54 news001 USDCHF,H4: |GџЂGџ™GџUSD
18:01:54 news001 USDCHF,H4: јGџAGџYGџUSD
18:01:54 news001 USDCHF,H4: јGџ
18:01:54 news001 USDCHF,H4:,Hџ0HџHџUSD
18:01:54 news001 USDCHF,H4: dHџhHџwHџUSD
18:01:54 news001 USDCHF,H4: "HџHHџ "HџUSD
18:01:54 news001 USDCHF,H4: MHџPHџkHџUSD
18:01:54 news001 USDCHF,H4: IџIџIџUSD etc.

Is there any way to solve the hieroglyphic problem? Screenshot of the same query in phpMyAdmin

Attach MySQL to MQ4 Buy/sell EAs and indicators Reading data from MYSQL

Александр 2009.07.03 15:13 #48

Putting a "wrapper" to work with MS SQL database

ADOLib.mqh wrapper and the COM server itself,

which provides you with MS SQL (and not only!) ADOLib.dll.

ADOLib.mqh looks like this:

// Constants for enum CursorTypeEnum

#define adOpenUnspecified 4294967295 //$FFFFFFFF;
#define adOpenForwardOnly 0 //$000000000000;
#define adOpenKeyset 1 //$00000001;
#define adOpenDynamic 2 //$00000002;
#define adOpenStatic 3 //$00000003;

// Constants for enum LockTypeEnum

#define adLockUnspecified 4294967295 //$FFFFFFFFFF;
#define adLockReadOnly 1 //$00000001
#define adLockPessimistic 2 //$00000002;
#define adLockOptimistic 3 //$$00000003;
#define adLockBatchOptimistic 4 //$00000004;

// Constants for enum ExecuteOptionEnum

#define adOptionUnspecified 4294967295 //$FFFFFFFFFF;
#define adAsyncExecute 16 //$00000010;
#define adAsyncFetch 32 //$00000020;
#define adAsyncFetchNonBlocking 64 //$00000040;
#define adExecuteNoRecords 128 //$00000080;
#define adExecuteStream 296 //$00000400;
#define adExecuteRecord 2048 //$00000800;

// Constants for enum CursorLocationEnum

#define adUseNone 1 //$00000001;
#define adUseServer 2 //$00000002;
#define adUseClient 3 //$00000003;
#define adUseClientBatch 3 //$00000003;

// Constants for enum CommandTypeEnum

#define adCmdUnspecified 4294967295 //$FFFFFFFFFF;
#define adCmdUnknown 8 //$00000008;
#define adCmdText 1 //$00000001;
#define adCmdTable 2 //$00000002;
#define adCmdStoredProc 4 //$00000004;
#define adCmdFile 256 //$00000100;
#define adCmdTableDirect 512 //$00000200;

#import "ADOLib.dll".
int CreateConnection();
int DestroyConnection();
int OpenConnection(string ConnectionString,int CursorLocation,int CommandTimeout);
int CloseConnection();
int IsOpenConnection();
int Execute(string CommandText,int ExecuteOption);
int BeginTrans();
int CommitTrans();
int RollbackTrans();
int OpenTable(string Qry,int CursorLocation,int CursorType,int LockType,int Options);
int CloseTable();
int Requery();
int Update();
int UpdateBatch();
int Cancel();
int CancelBatch();
int CancelUpdate();
int Find(string Criteria,int SearchDirection,int Start);
int Filter(string Criteria);
int BOF();
int EOF();
int MoveFirst();
int MoveLast();
int MoveNext();
string TableStatus();
int FieldsCount();
string FieldName(int I);
string FieldType(int Name);
string FieldTypeByPos(int I);
string GetFieldValue(string Name);
string GetFieldValueByPos(int I);
int SetFieldValue(string Name);
int SetFieldValueByPos(int I);

Execute SQL from Metatrader Getting available symbols and Preparing bound queries: DatabasePrepare

Александр 2009.07.03 15:23 #49

Example of connection to MS SQL 2005 database "dbForex"

int createCnn=0;
int openCnn=0;
int Insert=0;

string StringConnection="DSN=dbForex;UID=sa;PWD=;";

int init()
{

CloseConnection();
DestroyConnection();

int createCnn=CreateConnection();
Sleep(10);

int openCnn=OpenConnection(StringConnection,adUseClient,0);
Sleep(10);

return(0);
}

Example operation:

int start()
{
//this is in case the connection is closed or "messed up"-reason enough
if (createCnn<=0 || IsOpenConnection()==0)
{
createCnn=0;
openCnn=0;

CloseConnection();
Sleep(10);

DestroyConnection();
Sleep(10);

createCnn=CreateConnection();
Sleep(30);
}

if (createCnn>0 &&(openCnn<=0 || IsOpenConnection()==0 || Insert==0))
{
openCnn=0;

CloseConnection();
Sleep(10);

openCnn=OpenConnection(StringConnection,adUseClient,0);
Sleep(30);
}

//and then write ticks into the database

string Company=AccountCompany();
string Symb=Symbol();

string CommandText="INSERT INTO Rates (TimeCurrent,AccountCompany,Symb,DateTimeRate,Ask,Bid) "+
"VALUES("+TimeCurrent()+", "+Company+"", "+Symb+"", "+DateTimeRate+"", "+Ask+", "+Bid+")";
Execute(CommandText,adAsyncFetch);
Sleep(15);

}

//+------------------------------------------------------------------+
//| expert deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
CloseConnection();
DestroyConnection();

return(0);
}

how to save data [WARNING CLOSED!] Any newbie [ARCHIVE] Any rookie question,

Александр 2009.07.03 15:30 #50

I assume that ADOLib.mqh is in the "include" directory and

ADOLib in the "Library" directory.

Now in the \Library directory, register

this COM object and type in regsvr32 ADOLib.dll,

press Enter and this library will be registered,

all of this can be done either from the command line console or,

let's say Total Commander.

If you're running Vista you should run both TC and

console must be run under an

"Administrator" account.

Library export enum Creating c# library for Errors, bugs, questions

How to access the database from MQL4 , ORACL , MSSQL, MySQL - page 5