Why can´t I implement Primary key in my SQL Table? - c++

Question

I try to save Data in my esp32. In my table there should be a primary key so that I can´t save something twice with the same id. But I get an error
The Error Code:
SQL error: disk I/O error
That´s the whole Code :
#include <stdio.h>
#include <string.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include "esp_err.h"
#include "esp_log.h"
#include "esp_spiffs.h"
#include "esp_timer.h"
#include "sqlite3.h"
static const char *TAG = "sqlite3_spiffs";
const char* data = "Callback function called";
static int callback(void *data, int argc, char **argv, char **azColName) {
int i;
printf("%s: ", (const char*)data);
for (i = 0; i<argc; i++){
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int db_open(const char *filename, sqlite3 **db) {
int rc = sqlite3_open(filename, db);
if (rc) {
printf("Can't open database: %s\n", sqlite3_errmsg(*db));
return rc;
} else {
printf("Opened database successfully\n");
}
return rc;
}
char *zErrMsg = 0;
int db_exec(sqlite3 *db, const char *sql) {
printf("%s\n", sql);
int64_t start = esp_timer_get_time();
int rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
if (rc != SQLITE_OK) {
printf("SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
} else {
printf("Operation done successfully\n");
}
printf("Time taken: %lld\n", esp_timer_get_time()-start);
return rc;
}
void setup()
{
sqlite3 *db1;
int rc;
ESP_LOGI(TAG, "Initializing SPIFFS");
esp_vfs_spiffs_conf_t conf = {
.base_path = "/spiffs",
//.partition_label = "storage",
.partition_label = NULL,
.max_files = 5,
.format_if_mount_failed = true
};
// Use settings defined above to initialize and mount SPIFFS filesystem.
// Note: esp_vfs_spiffs_register is an all-in-one convenience function.
esp_err_t ret = esp_vfs_spiffs_register(&conf);
if (ret != ESP_OK) {
if (ret == ESP_FAIL) {
ESP_LOGE(TAG, "Failed to mount or format filesystem");
} else if (ret == ESP_ERR_NOT_FOUND) {
ESP_LOGE(TAG, "Failed to find SPIFFS partition");
} else {
ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
}
return;
}
size_t total = 0, used = 0;
ret = esp_spiffs_info(NULL, &total, &used);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
} else {
ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
}
// remove existing file
unlink("/spiffs/test1.db");
unlink("/spiffs/test2.db");
sqlite3_initialize();
if (db_open("/spiffs/test1.db", &db1))
return;
rc = db_exec(db1, "CREATE TABLE entries(id STRING PRIMARY KEY, value ,section)");
if (rc != SQLITE_OK) {
sqlite3_close(db1);
return;
}
rc = db_exec(db1, "INSERT INTO entries VALUES ('ROOMNAME', 'HH180L23G', 'general');");
if (rc != SQLITE_OK) {
sqlite3_close(db1);
return;
}
rc = db_exec(db1, "SELECT * FROM entries");
if (rc != SQLITE_OK) {
sqlite3_close(db1);
return;
}
sqlite3_close(db1);
// All done, unmount partition and disable SPIFFS
esp_vfs_spiffs_unregister(NULL);
ESP_LOGI(TAG, "SPIFFS unmounted");
//while(1);
}
void loop() {
// put your main code here, to run repeatedly:
}
I have ideas like that it has something to do with spiffs or with the mounting ..
I tried both partition.labels .. it´s the same error ..
I can´t figure out why it doesn´t let me take a primary key .. the same thing as I can´t implement unique Text or something I get the same error..
Did someone have experienced it before ?
It would be such a huge support
Log Monitor:
Opened database successfully
CREATE TABLE entries(id STRING PRIMARY KEY, value ,section)
SQL error: disk I/O error
Time taken: 179044

Answer 1

Looks like a known problem: https://github.com/siara-cc/esp32_arduino_sqlite3_lib/issues/18
Somebody has posted a workaround/fix, which doesn't look very promising to me - they explicitly specify the label of the SPIFFS partition when mounting it. Try it, see if it works.
https://github.com/siara-cc/esp32-idf-sqlite3/issues/13