MQL5 ReferenceWorking with databasesDatabaseColumnName

DatabaseColumnName

Gets a field name by index.

bool  DatabaseColumnName(
   int      request,     // request handle received in DatabasePrepare
   int      column,      // field index in the request
   string&  name         // the reference to the variable for receiving the field name
   );

Parameters

request

[in] Request handle received in DatabasePrepare().

column

[in] Field index in the request. Field numbering starts from zero and cannot exceed DatabaseColumnsCount() - 1.

name

[out] Variable for writing the field name.

Return Value

Return true if successful, otherwise false. To get the error code, use GetLastError(), the possible responses are:

ERR_DATABASE_INVALID_HANDLE (5121) – invalid request handle;
ERR_DATABASE_NO_MORE_DATA (5126) – 'column' index exceeds DatabaseColumnsCount() -1.

Note

The value can be obtained only if at least one DatabaseRead() call has been preliminarily made for 'request'.