/**
* show_results - Show a result set from the server via Serial.print
*
* This method reads a result from the server and displays it via the
* via the Serial.print methods. It can be used in cases where
* you may want to issue a SELECT or SHOW and see the results on your
* computer from the Arduino.
*
* It is also a good example of how to read a result set from the
* because it uses the public methods designed to return result
* sets from the server.
*/
void Connector::show_results() {
column_names *cols;
int rows = 0;
// Get the columns
cols = get_columns();
if (cols == NULL) {
return;
}
for (int f = 0; f < columns.num_fields; f++) {
Serial.print(columns.fields[f]->name);
if (f < columns.num_fields-1)
Serial.print(',');
}
Serial.println();
// Read the rows
while (get_next_row()) {
rows++;
for (int f = 0; f < columns.num_fields; f++) {
Serial.print(row.values[f]);
if (f < columns.num_fields-1)
Serial.print(',');
}
free_row_buffer();
Serial.println();
}
// Report how many rows were read
Serial.print(rows);
Serial.println(" rows in result.");
free_columns_buffer();
}
/*
get_columns - Get a list of the columns (fields)
This method returns an instance of the column_names structure
that contains an array of fields.
Note: you should call free_columns_buffer() after consuming
the field data to free memory.
*/
column_names *MySQL_Cursor::get_columns() {
free_columns_buffer();
free_row_buffer();
num_cols = 0;
if (get_fields()) {
columns_read = true;
return &columns;
}
else {
return NULL;
}
}
/*
show_results - Show a result set from the server via Serial.print
This method reads a result from the server and displays it via the
via the Serial.print methods. It can be used in cases where
you may want to issue a SELECT or SHOW and see the results on your
computer from the Arduino.
It is also a good example of how to read a result set from the
because it uses the public methods designed to return result
sets from the server.
*/
void MySQL_Cursor::show_results() {
column_names *cols;
int rows = 0;
// Get the columns
cols = get_columns();
if (cols == NULL) {
return;
}
for (int f = 0; f < columns.num_fields; f++) {
Serial.print(columns.fields[f]->name);
if (f < columns.num_fields-1)
Serial.print(',');
}
Serial.println();
// Read the rows
while (get_next_row()) {
rows++;
for (int f = 0; f < columns.num_fields; f++) {
Serial.print(row.values[f]);
if (f < columns.num_fields-1)
Serial.print(',');
}
free_row_buffer();
Serial.println();
}
// Report how many rows were read
Serial.print(rows);
conn->show_error(ROWS, true);
free_columns_buffer();
// Free any post-query messages in queue for stored procedures
clear_ok_packet();
}
/*
Close
Takes care of removing allocated memory.
*/
void MySQL_Cursor::close() {
free_columns_buffer();
free_row_buffer();
}
