Shared/Database: Fix transactions not being recommitted on dead-lock error

Fix transactions not being recommitted on dead-lock error (error code 1213) because of calling http://dev.mysql.com/doc/refman/5.0/en/mysql-errno.html after sending the ROLLBACK command. This way the returned error code was related to the ROLLBACK command, not the failed transaction.

src/server/shared/Database/MySQLConnection.cpp

@@ -359,11 +359,11 @@ void MySQLConnection::CommitTransaction()
     Execute("COMMIT");
 }
 
-bool MySQLConnection::ExecuteTransaction(SQLTransaction& transaction)
+int MySQLConnection::ExecuteTransaction(SQLTransaction& transaction)
 {
     std::list<SQLElementData> const& queries = transaction->m_queries;
     if (queries.empty())
-        return false;
+        return -1;
 
     BeginTransaction();
 
@@ -380,8 +380,9 @@ bool MySQLConnection::ExecuteTransaction(SQLTransaction& transaction)
                 if (!Execute(stmt))
                 {
                     TC_LOG_WARN("sql.sql", "Transaction aborted. %u queries not executed.", (uint32)queries.size());
+                    int errorCode = GetLastError();
                     RollbackTransaction();
-                    return false;
+                    return errorCode;
                 }
             }
             break;
@@ -392,8 +393,9 @@ bool MySQLConnection::ExecuteTransaction(SQLTransaction& transaction)
                 if (!Execute(sql))
                 {
                     TC_LOG_WARN("sql.sql", "Transaction aborted. %u queries not executed.", (uint32)queries.size());
+                    int errorCode = GetLastError();
                     RollbackTransaction();
-                    return false;
+                    return errorCode;
                 }
             }
             break;
@@ -406,7 +408,7 @@ bool MySQLConnection::ExecuteTransaction(SQLTransaction& transaction)
     // and not while iterating over every element.
 
     CommitTransaction();
-    return true;
+    return 0;
 }
 
 MySQLPreparedStatement* MySQLConnection::GetPreparedStatement(uint32 index)