Image not retrieving from sql database in objective c - ios

Question

Hello I have been trying to retrieve image from sql database named informationdb.sql but I am not able to,could anyone help with that.Here is my code
- (NSData*) LoadImagesFromSql
{
NSData* data = nil;
directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [directoryPaths objectAtIndex:0];
NSString * databasePath = [[NSString alloc]initWithString:[documentsDirectory stringByAppendingPathComponent:#"informationdb.sql"]];
int openDatabaseResult = sqlite3_open_v2([databasePath UTF8String], &sqlite3DatabaseObject, SQLITE_OPEN_READWRITE , NULL);
if (openDatabaseResult == SQLITE_OK) {
const char* sqlite3Query = "SELECT PHOTO FROM PICTURES";
int sqlite3Prepare = sqlite3_prepare_v2(sqlite3DatabaseObject, sqlite3Query, -1, &sqlite3Statement, NULL);
if( sqlite3Prepare == SQLITE_OK )
{
const char *myData = sqlite3_column_blob(sqlite3Statement, 1);
int myDataSize = sqlite3_column_bytes(sqlite3Statement, 1);
data = [NSData dataWithBytes:myData length:myDataSize];
sqlite3_step(sqlite3Statement);
}
sqlite3_finalize(sqlite3Statement);
}
sqlite3_close(sqlite3DatabaseObject);
return data;
}
Thank you.

Answer 1

first delete database in document directory than change all three method to my code
-(void)database
{
directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [directoryPaths objectAtIndex:0];
NSString * databasePath = [[NSString alloc]initWithString:[documentsDirectory stringByAppendingPathComponent:#"informationdb.sql"]];
NSLog(#"database path=%#",databasePath);
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:databasePath] == NO) {
const char *dbPath = [databasePath UTF8String];
if (sqlite3_open(dbPath, &sqlite3DatabaseObject)== SQLITE_OK) {
char * errorMessage;
const char *sqlite3Query = "CREATE TABLE IF NOT EXISTS PICTURES (PHOTO BLOB,Id integer PRIMARY KEY)";
if (sqlite3_exec(sqlite3DatabaseObject, sqlite3Query, NULL, NULL, &errorMessage)!= SQLITE_OK) {
NSLog(#"failed = %#",sqlite3DatabaseObject);
}
sqlite3_close(sqlite3DatabaseObject);
}else{
NSLog(#"failed to create database");
}
}
}
- (void) SaveImagesToSql: (NSData*) imgData {
directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [directoryPaths objectAtIndex:0];
NSString * databasePath = [[NSString alloc]initWithString:[documentsDirectory stringByAppendingPathComponent:#"informationdb.sql"]];
NSLog(#"database path=%#",databasePath);
const char* sqlite3Query = "INSERT INTO PICTURES (PHOTO) VALUES (?)";
int openDatabaseResult = sqlite3_open_v2([databasePath UTF8String], &sqlite3DatabaseObject, SQLITE_OPEN_READWRITE , NULL);
if (openDatabaseResult == SQLITE_OK) {
int sqlite3Prepare = sqlite3_prepare_v2(sqlite3DatabaseObject, sqlite3Query, -1, &sqlite3Statement, NULL);
if( sqlite3Prepare == SQLITE_OK ) {
sqlite3_bind_blob(sqlite3Statement, 1, [imgData bytes], [imgData length], SQLITE_TRANSIENT);
sqlite3_step(sqlite3Statement);
}
else
{
NSLog(#"Error is: %s", sqlite3_errmsg(sqlite3DatabaseObject));
}
sqlite3_finalize(sqlite3Statement);
}
else NSLog( #"Error is: %s", sqlite3_errmsg(sqlite3DatabaseObject) );
sqlite3_close(sqlite3DatabaseObject);
}
- (NSData*)LoadImagesFromSql
{
NSData* data = nil;
directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [directoryPaths objectAtIndex:0];
NSString * databasePath = [[NSString alloc]initWithString:[documentsDirectory stringByAppendingPathComponent:#"informationdb.sql"]];
sqlite3_stmt *compiledStmt;
sqlite3 *db;
int i = 1;
if(sqlite3_open([databasePath UTF8String], &db)==SQLITE_OK){
NSString *insertSQL = [NSString stringWithFormat:#"SELECT PHOTO FROM PICTURES WHERE Id = %d",i];
if(sqlite3_prepare_v2(db,[insertSQL cStringUsingEncoding:NSUTF8StringEncoding], -1, &compiledStmt, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStmt) == SQLITE_ROW) {
int length = sqlite3_column_bytes(compiledStmt, 0);
data = [NSData dataWithBytes:sqlite3_column_blob(compiledStmt, 0) length:length];
NSLog(#"Length : %lu", (unsigned long)[data length]);
// if(imageData == nil)
// NSLog(#"No image found.");
// else
// imgView.image = [UIImage imageWithData:imageData];
}
}
sqlite3_finalize(compiledStmt);
}
sqlite3_close(db);
return data;
}

Answer 2

solved it by this:
- (NSData*) LoadImagesFromSql
{
directoryPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [directoryPaths objectAtIndex:0];
NSString * databasePath = [[NSString alloc]initWithString:[documentsDirectory stringByAppendingPathComponent:#"informationdb.sql"]];
NSData* data = nil;
// int i=0;
NSString* sqlite3Query = [NSString stringWithFormat:#"SELECT PHOTO FROM PICTURES "];
int openDatabaseResult = sqlite3_open_v2([databasePath UTF8String], &sqlite3DatabaseObject, SQLITE_OPEN_READWRITE , NULL);
if (openDatabaseResult == SQLITE_OK)
{
int sqlite3Prepare = sqlite3_prepare_v2(sqlite3DatabaseObject, [sqlite3Query UTF8String], -1, &sqlite3Statement, NULL);
if( sqlite3Prepare == SQLITE_OK )
{
while (sqlite3_step(sqlite3Statement) == SQLITE_ROW) {
const char *myData = sqlite3_column_blob(sqlite3Statement, 0);
int myDataSize = sqlite3_column_bytes(sqlite3Statement, 0);
data = [NSData dataWithBytes:myData length:myDataSize];
}
sqlite3_finalize(sqlite3Statement);
}
}
sqlite3_close(sqlite3DatabaseObject);
return data;
}
and updated viewWillAppear as :
-(void)viewWillAppear:(BOOL)animated{
dbmClass = [[DBManager alloc]init];
if (imgPic.image != nil) {
imgPic.image = nil;
}
imgPic.image = [UIImage imageWithData:[dbmClass LoadImagesFromSql]];
NSLog(#"%#",[dbmClass LoadImagesFromSql]);
}