ChuckBell
commented
5 years ago Try closing the cursor before running a second query.
On 8/5/19 3:54 PM, chakthy wrote:
I used the following code. The first query works and at the end of query2 I get the printed message. It looks like the program fails trying to fetch the columns. If I remove the column code it goes through all the code but displays the error that columns should be fetch first.
if (conn.connected()) { // Initiate the query class instance MySQL_Cursor *cur_mem = new MySQL_Cursor(&conn); sprintf(query, INSERT_SQL,card1,card2,card3,card4); Serial.println(query); cur_mem->execute(query); Serial.println("Record created"); delay(1000);
|//This is to retrieve if the card is active or not sprintf(query2, INSERT_SQL2,card1,card2,card3,card4); Serial.println(query2); cur_mem->execute(query2); Serial.println("second query"); // Fetch the columns (required) but we don't use them. column_names *cols = cur_mem->get_columns(); Serial.println("columns"); for (int f = 0; f < cols->num_fields; f++) { Serial.print(cols->fields[f]->name); if (f < cols->num_fields - 1) { Serial.print(", "); } } Serial.println(); // Read the row (we are only expecting the one) do { row = cur_mem->get_next_row(); if (row != NULL) { // for (int f = 0; f < cols->num_fields; f++) { // Serial.print(row->values[f]); head_count = atol(row->values[0]); Serial.print(" "); // } Serial.println(); Serial.println("got though row code"); } } while (row != NULL); // Deleting the cursor also frees up memory used Serial.println("got here"); |
// Show the result Serial.print(" Status = "); Serial.println(head_count);
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chakthy
I used the following code. The first query works and at the end of query2 I get the printed message. It looks like the program fails trying to fetch the columns. If I remove the column code it goes through all the code but displays the error that columns should be fetch first.
if (conn.connected()) { // Initiate the query class instance MySQL_Cursor *cur_mem = new MySQL_Cursor(&conn); sprintf(query, INSERT_SQL,card1,card2,card3,card4); Serial.println(query); cur_mem->execute(query);
Serial.println("Record created"); delay(1000);
// Show the result Serial.print(" Status = "); Serial.println(head_count);