Create Sqlite database in iOS - ios

Question

I am unable to create sqlite database in my documents directory.
Here is the code:
NSString *fileDir;
NSArray *dirPaths;
//Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(NSDemoApplicationDirectory, NSUserDomainMask, YES);
fileDir = [dirPaths objectAtIndex:0];
// Build the database path
databasePath = [[NSString alloc]initWithString:[fileDir stringByAppendingPathComponent:#"student.sql"]];
NSFileManager *fileMgr = [NSFileManager defaultManager];
if([fileMgr fileExistsAtPath:databasePath] == NO)
{
const char *dbPath = [databasePath UTF8String];
if (sqlite3_open(dbPath, &database) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt = "CREATE TABLE IF NOT EXISTS CONTACTS(ID INTEGER PRIMARY KEY , NAME TEXT, ADDRESS TEXT, MOBILE INTEGER)";
if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK) {
_status.text = #"Failed to create table";
}
sqlite3_close(database);
}
else
{
_status.text = #"Failed to open/create database";
}
}
I have debug the code and found that the compiler is not going under this condition.
sqlite3_open(dbPath, &database) == SQLITE_OK
I don't know what i am doing wrong.
Any help will be appreciated...
Thanks,

Answer 1

Check you code to get dirPath, you are getting right path or not, I used following way in my code and its working for me :
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
// dirPaths = NSSearchPathForDirectoriesInDomains(NSDemoApplicationDirectory, NSUserDomainMask,YES);
fileDir = dirPaths[0];
// Build the database path
databasePath = [[NSString alloc]initWithString:[fileDir stringByAppendingPathComponent:#"student.sqlite"]];

Answer 2

this is how i managed it.
DataBaseAccess.m
static sqlite3 *database=nil;
-(id)init
{
if(self=[super init])
{
self.user_data=#"user_data.db";
}
return self;
}
-(void)createUserDataDatabase
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:user_data];
success = [fileManager fileExistsAtPath:writableDBPath];
if (success) return;
// construct database from external ud.sql
NSString *filePath=[[NSBundle mainBundle]pathForResource:#"ud" ofType:#"sql"];
NSString *sqlStatement=[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
if(sqlite3_open([writableDBPath UTF8String], &database)==SQLITE_OK)
{
sqlite3_exec(database, [sqlStatement UTF8String], NULL, NULL, NULL);
sqlite3_close(database);
}
}
Your external sql file must contain the sql queries:
CREATE TABLE quantityInSubCountries (
refID INT,
quantity INT
);
CREATE TABLE quantityInSubRegions (
refID INT,
quantity INT
); ....
Hope it will help.

Answer 3

This is common methods used for Database
-(void)updateTable:(NSString *)tableName setname:(NSString *)Name setImagePath:(NSString *)imagePath whereID:(NSInteger)rid{
NSString *sqlString=[NSString stringWithFormat:#"update %# set name='%#' where id=%ld",tableName,Name,rid];
char *error;
if (sqlite3_exec(db, [sqlString UTF8String], NULL, NULL, &error)!=SQLITE_OK) {
[self closeDatabase];
NSLog(#"Faield to update");
}
else{
NSLog(#"update successfully");
}
}
-(void)deleteFrom:(NSString *)tablename whereName:(NSInteger )rid {
NSString *sqlString=[NSString stringWithFormat:#"delete from %# where id=%ld",tablename,(long)rid];
char *error;
if (sqlite3_exec(db, [sqlString UTF8String], NULL, NULL, &error)!=SQLITE_OK) {
[self closeDatabase];
NSLog(#"faield to Delete");
}
else{
NSLog(#"Deleted successfully");
}
}
-(void)insertInTable:(NSString *)tableName withName:(NSString *)name withImagePath:(NSString *)imagePath
{
NSString *sqlString=[NSString stringWithFormat:#"insert into %#(name,path)values('%#','%#')",tableName,name,imagePath];
char *error;
if (sqlite3_exec(db, [sqlString UTF8String], NULL, NULL, &error)!=SQLITE_OK) {
[self closeDatabase];
NSLog(#"Failed to insert");
}
else{
NSLog(#"Inserted succesfully");
}
}
-(NSString *)path
{
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir=[paths objectAtIndex:0];
return [documentDir stringByAppendingPathComponent:#"Storage.db"];
}
-(void)open{
if(sqlite3_open([[self path] UTF8String], &db)!=SQLITE_OK)
{
sqlite3_close(db);
NSLog(#"your database table has been crash");
}
else{
NSLog(#"Database open successfully");
}
}
-(void)closeDatabase
{
sqlite3_close(db);
NSLog(#"Database closed");
}
-(void)copyFileToDocumentPath:(NSString *)fileName withExtension:(NSString *)ext{
NSString *filePath=[self path];
NSFileManager *fileManager=[NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:filePath]) {
NSString *pathToFileInBundle=[[NSBundle mainBundle] pathForResource:fileName ofType:ext];
NSError *err=nil;
BOOL suc=[fileManager copyItemAtPath:pathToFileInBundle toPath:filePath error:&err];
if (suc) {
NSLog(#"file copied successfully");
}
else
{
NSLog(#"faield to copied");
}
}
else
{
NSLog(#"File allready present");
}
}
-(NSMutableArray *)AllRowFromTableName:(NSString *)tableName{
NSMutableArray *array=[[NSMutableArray alloc] init];
NSString *sqlString=[NSString stringWithFormat:#"select *from %#",tableName];
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(db, [sqlString UTF8String], -1, &statement, nil)==SQLITE_OK) {
while (sqlite3_step(statement)==SQLITE_ROW) {
Database *tempDatabase=[[Database alloc] init];
tempDatabase.Hid=sqlite3_column_int(statement, 0);
tempDatabase.Hname =[[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 1)];
tempDatabase.Hpath=[[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 2)];
[array addObject:tempDatabase];
}
}
return array;
}
-(void)test
{
//Pet photos
NSString *sqlString=[NSString stringWithFormat:#"create table if not exists StorageTable(id integer primary key autoincrement,name text,path text)"];
char *error;
if (sqlite3_exec(db, [sqlString UTF8String], NULL, NULL, &error)!=SQLITE_OK) {
[self closeDatabase];
NSLog(#"Faield to blanck 1 %s",error);
}
else{
NSLog(#"Test On StorageTable Database successfully");
}
}