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    <p>Thanks mmcomb, Thanks Mat. From both your advices i have solved the problem completely.</p> <ul> <li><p><strong>Firstly</strong> I wasn't checking the DB path and then opening the connection.</p></li> <li><p><strong>Secondly</strong> after having prepared the statement and bounding the appropriate variables i had to call <code>sqlite3_step</code> before calling <code>sqlite3_last_insert_rowid</code>.</p></li> <li><p><strong>Thirdly</strong> i needed to call <code>sqlite3_finalize</code> to free the resources.</p></li> <li><p><strong>Fourthly</strong> i needed to <code>sqlite3_close</code> the connection.</p></li> </ul> <p>'library routine called out of sequence' error was due to not opening and closing the connection properly. </p> <p>This is the right code:</p> <pre><code>NSInteger keyID; // in .h class NSMutableArray *user;// in .h class -(void) writeintoUserDatabase:(NSString*)value1:(NSString*)value2:(NSString*)value3 { sqlite3* database; databaseName = @"UserData";// create a db with this name and keep it in app resources folder NSString *pathToDatabase; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); NSString *documentsDir = [documentPaths objectAtIndex:0]; pathToDatabase = [documentsDir stringByAppendingPathComponent:databaseName]; int databaseReturnCode = sqlite3_open([pathToDatabase UTF8String], &amp;database); NSLog(@"databaseReturnCode %d",databaseReturnCode); if(databaseReturnCode == SQLITE_OK) { const char *sql = "insert into UserData(firstName,lastName,userName) Values(?, ?, ?)"; sqlite3_stmt *insert_statement; sqlite3_prepare_v2(database, sql, -1, &amp;insert_statement, NULL); sqlite3_bind_text(insert_statement, 1, [value0 UTF8String], -1, SQLITE_TRANSIENT); sqlite3_bind_text(insert_statement, 2, [value1 UTF8String], -1, SQLITE_TRANSIENT); sqlite3_bind_text(insert_statement, 3, [value2 UTF8String], -1, SQLITE_TRANSIENT); printf( "is there an error?: %s\n", sqlite3_errmsg(database) ); while(sqlite3_step(insert_statement) == SQLITE_ROW) { NSString *aFirstName = [NSString stringWithUTF8String: (char*)sqlite3_column_text(insert_statement, 1)]; NSString *aLastName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(insert_statement, 2)]; NSString *aUserName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(insert_statement, 3)]; users = [[NSMutableArray alloc]initWithObjects:aFirstName,aLastName,aUserName,nil]; } keyID = sqlite3_last_insert_rowid(database); sqlite3_reset(insert_statement); sqlite3_finalize(insert_statement); } sqlite3_close(database); } </code></pre>
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