MQL4 MySQL Connector for Builds 600+
Info
The MQL4 MySQL Connector for Builds 600+ is a Library for MetaTrader 4 that mql4 mysql connector for builds 600+this library enables mql4 (metatrader 4) to connect to mysql databases. It addresses the string format changes introduced in MetaTrader 4 build 600, where MQL4 strings shifted from ANSI to Unicode, impacting direct DLL communication.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 4 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL4/Libraries folder via File ? Open Data Folder in MetaTrader 4.
How to Install and Use MQL4 MySQL Connector for Builds 600+
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
MQL4 MySQL Connector for Builds 600+This library enables MQL4 (MetaTrader 4) to connect to MySQL databases.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 4.
Compatible Platform & Setup
This Library works on MetaTrader 4. Place the file in the MQL4/Libraries folder and restart the terminal.
Description & Settings
Related: Simple Unit Test Include Library for MQL4 - another powerful library for MetaTrader 4 traders.
MQL4 MySQL Connector for Builds 600+This library enables MQL4 (MetaTrader 4) to connect to MySQL databases. It addresses the string format changes introduced in MetaTrader 4 build 600, where MQL4 strings shifted from ANSI to Unicode, impacting direct DLL communication.
Also recommended: mt4r for MQL4: A Compatibility Update - similar library with strong performance on MetaTrader 4.
This version is a fork of the work by vedroid, which was originally based on Russel's MySQL wrapper. It incorporates techniques from the eax_mysql library and snippets shared by gchrmt4. Contributions are welcome.
Example Usage:
#include
string host = "localhost";
string user = "root";
string pass = "123456";
string dbname = "information_schema";
int port = 3306;
int socket = 0;
int client = 0;
int dbconnectid = 0;
bool goodconnect = false;
int start () {
goodconnect = init_mysql(dbconnectid, host, user, pass, dbname, port, socket, client);
if ( !goodconnect ) {
return (1); // Indicates connection failure
}
// Fetch multiple columns from multiple rows
string query = stringconcatenate(
"select `table_name`, `table_rows`, `create_time`, `check_time` " ,
"from `tables" ,
"where `table_schema` = 'mysql'"
);
string data[][4]; // The second dimension size must match the number of columns
int result = mysql_fetcharray(dbconnectid, query, data);
if ( result == 0 ) {
// No rows selected
} else if ( result == -1 ) {
// An error occurred
} else {
int num_rows = arrayrange(data, 0);
int num_fields = arrayrange(data, 1);
for ( int i = 0; i < num_rows; i++) {
string line = "";
for ( int j = 0; j < num_fields; j++ ) {
string value = data[i][j];
line = stringconcatenate(line, value, ";");
}
print(line);
}
}
// Single row fetch (similar to array fetch)
string row[][4]; // The second dimension size must match the number of columns
string rowquery = stringconcatenate("select `table_name`, `table_rows`, `create_time`, `check_time` " ,
"from `tables" ,
"where `table_schema` = 'mysql' " ,
"limit 0,1"
);
int row_result = mysql_fetcharray(dbconnectid, rowquery, row);
line = "one row query: ";
for(int r=0; r < arrayrange(row, 1); r++) {
line = stringconcatenate(line, row[0][r], ";");
}
print(line);
// Sample insert (example only, cannot insert into information_schema)
/*string insertquery = stringconcatenate(
"insert into `character_sets` values (" , "sometext"
, "," , "onemoretext"
, "," , "andvarialbe"
, "," , "nextwillbenumber"
, "," , 2
, ")"
);
if ( mysql_query(dbconnectid, insertquery) ) {
print("insert good");
}*/
deinit_mysql(dbconnectid);
return (0);
}
Source Code:
The source code is available on the github repository. Contributions are highly appreciated.
You may also like: MQL4 HTTP Requests using WinINet.dll (MT4 Build 600+) - excellent alternative for library users on MetaTrader 4.
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#import "kernel32.dll"
int lstrlena(int);
void rtlmovememory(uchar & arr[], int, int);
int localfree(int); // may need to be changed depending on how the dll allocates memory
#import
#import "msvcrt.dll"
int memcpy(char &destination[], int source, int length);
int memcpy(char &destination[], long source, int length);.......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.