Add table to existing database IOS sqlite [closed] - ios

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I am using SQLite DB in my iOS app. In my screen 1, I was successfully able to create a Database, a table, insert into it and retrieve from it.
However from screen 2 when I am trying to create a table in the same database and insert values, I am unable to.
This is the code which I am using.
-(void) createDB{
NSString *docsDir;
NSArray *dirPaths;
// Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
// Build the path to the database file
_databasePath = [[NSString alloc]
initWithString: [docsDir stringByAppendingPathComponent:
#"coning.db"]];
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: _databasePath ] == NO)
{
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt =
"CREATE TABLE IF NOT EXISTS order (ID INTEGER PRIMARY KEY AUTOINCREMENT , NAME TEXT UNIQUE , ADDRESS TEXT UNIQUE, PHONE TEXT UNIQUE)";
if (sqlite3_exec(_contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
{
NSLog(#"Failed to create table");
}
sqlite3_close(_contactDB);
} else {
NSLog(#"Failed to open/create database");
}
}
}
- (void)saveData {
sqlite3_stmt *statement;
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:
#"INSERT OR REPLACE INTO order (name, address, phone) VALUES (\"%#\", \"%#\", \"%#\")",
#"name", #"address", #"phone"];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(_contactDB, insert_stmt,
-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
NSLog(#"added");
} else {
NSLog(#"Failed to add contact");
}
sqlite3_finalize(statement);
sqlite3_close(_contactDB);
}
}
I have been using the same code to add entries in table 1 but when I do the same to create table 2, its says 'Failed to add contact'. Can someone suggest where I might be going wrong?
Also I want to make the PK of table 1 as a FK in table 2.

Answer 1

You can use sqlite3_exec() method instead of sqlite3_step().
sqlite3_exec() will execute whatever the query you have given.
I am sure, It will definitely help you.
-(BOOL)createNewTableInExistingDb
{
NSArray *array=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath=[array objectAtIndex:0];
filePath =[filePath stringByAppendingPathComponent:#"database.db"];
NSFileManager *manager=[NSFileManager defaultManager];
BOOL success = NO;
if ([manager fileExistsAtPath:filePath])
{
success =YES;
}
if (!success)
{
NSString *path2=[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"database.db"];
success =[manager copyItemAtPath:path2 toPath:filePath error:nil];
}
createStmt = nil;
NSString *tableName=#"SecondTable";
if (sqlite3_open([filePath UTF8String], &database) == SQLITE_OK) {
if (createStmt == nil) {
NSString *query=[NSString stringWithFormat:#"create table %#(RegNo integer, name text)",tableName];
if (sqlite3_prepare_v2(database, [query UTF8String], -1, &createStmt, NULL) != SQLITE_OK) {
return NO;
}
sqlite3_exec(database, [query UTF8String], NULL, NULL, NULL);
return YES;
}
}
return YES;
}