Add long blob example

Author: siara-cc

examples/sqlite3_insert_long_blob/sqlite3_insert_long_blob.ino

@@ -0,0 +1,105 @@
+/* Example to create a table and insert 5000 bytes into blob column.
+   Creates the database on SD Card connected to the SDMMC port.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+#include <SPI.h>
+#include <FS.h>
+#include "SD_MMC.h"
+
+const char* data = "Callback function called";
+static int callback(void *data, int argc, char **argv, char **azColName){
+   int i;
+   Serial.printf("%s: ", (const char*)data);
+   for (i = 0; i<argc; i++){
+       Serial.printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+   }
+   Serial.printf("\n");
+   return 0;
+}
+
+int openDb(const char *filename, sqlite3 **db) {
+   int rc = sqlite3_open(filename, db);
+   if (rc) {
+       Serial.printf("Can't open database: %s\n", sqlite3_errmsg(*db));
+       return rc;
+   } else {
+       Serial.printf("Opened database successfully\n");
+   }
+   return rc;
+}
+
+char *zErrMsg = 0;
+int db_exec(sqlite3 *db, const char *sql) {
+   Serial.println(sql);
+   long start = micros();
+   int rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
+   if (rc != SQLITE_OK) {
+       Serial.printf("SQL error: %s\n", zErrMsg);
+       sqlite3_free(zErrMsg);
+   } else {
+       Serial.printf("Operation done successfully\n");
+   }
+   Serial.print(F("Time taken:"));
+   Serial.println(micros()-start);
+   return rc;
+}
+
+#define DATA_SIZE 5000
+
+void setup() {
+   Serial.begin(115200);
+   sqlite3 *db1;
+   sqlite3_stmt *res;
+   const char *tail;
+   int rc;
+
+   char *data = (char *) malloc(DATA_SIZE);
+
+   SPI.begin();
+   SD_MMC.begin();
+
+   sqlite3_initialize();
+
+   // Open database 1
+   if (openDb("/sdcard/test_long_data.db", &db1))
+       return;
+
+   rc = db_exec(db1, "CREATE TABLE IF NOT EXISTS test (c1 blob)");
+   if (rc != SQLITE_OK) {
+       sqlite3_close(db1);
+       return;
+   }
+
+   for (int i = 0; i < DATA_SIZE; i++) {
+     data[i] = 'a' + i % 26;
+   }
+   const char *sql = "INSERT INTO test VALUES (?)";
+   rc = sqlite3_prepare_v2(db1, sql, strlen(sql), &res, &tail);
+   if (rc != SQLITE_OK) {
+     Serial.printf("ERROR preparing sql: %s\n", sqlite3_errmsg(db1));
+     sqlite3_close(db1);
+     return;
+   }
+   sqlite3_bind_blob(res, 1, data, DATA_SIZE, SQLITE_STATIC);
+   if (sqlite3_step(res) != SQLITE_DONE) {
+     Serial.printf("ERROR inserting data: %s\n", sqlite3_errmsg(db1));
+     sqlite3_close(db1);
+     return;
+   }
+   sqlite3_finalize(res);
+
+   rc = db_exec(db1, "Select length(c1), substr(c1, 1, 10) from test");
+   if (rc != SQLITE_OK) {
+     sqlite3_close(db1);
+     return;
+   }
+
+   sqlite3_close(db1);
+
+}
+
+void loop() {
+}
+