iOS SQLite insert and select not working? - ios

Question

I am trying to read/write to a SQLite db but I keep getting errors. I've verified that the db exists in ...iPhone Simulator/Applications/5.1/app#/Documents/kipSQLDB.db
I've done INSERT and SELECT to it from Terminal.
But from the app it just errors out. (Additional question - is there a way with sqlite to get informative error messages like mysql_error in mysql? When I error in the app I get nothing but some symbols.
Here's my code:
.h
#import <Foundation/Foundation.h>
#import <sqlite3.h>
#interface SQLiteController : NSObject {
//file management
NSFileManager *fileManager;
NSString *documentsDirectory;
//sqlite data
sqlite3* databaseHandle;
}
- (void) initSQLiteDB;
- (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName;
- (NSArray* ) getData;
#end
.m
- (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName {
NSString* insertStatement = [NSString stringWithFormat:#"INSERT INTO nameList (userFName, userLName, userCompany) VALUES (\"%#\", \"%#\", \"%#\")", fName, lName, companyName];
NSLog(#"%#", insertStatement);
char *error;
if ( sqlite3_exec(databaseHandle, [insertStatement UTF8String], NULL, NULL, &error) == SQLITE_OK) {
int recordID = sqlite3_last_insert_rowid(databaseHandle);
NSLog(#"A record was inserted into the database %# with the id of %i", databaseHandle, recordID);
} else {
NSLog(#"Error: %s", error);
}
}
- (NSArray* ) getData {
NSMutableArray* dataArray = [[NSMutableArray alloc] init];
NSString* getStatement = #"SELECT * FROM nameList";
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(databaseHandle, [getStatement UTF8String], -1, &statement, NULL) == SQLITE_OK){
// Iterate over all returned rows
while (sqlite3_step(statement) == SQLITE_ROW) {
int recordID = sqlite3_column_int(statement, 0);
NSString* fNameFromDB = [NSString stringWithUTF8String:(char*)sqlite3_column_text(statement, 1)];
NSLog(#"%#", fNameFromDB);
}
} else {
NSLog(#"No soup for you!");
}
return 0;
}
#end

Answer 1

Use Try catch format and catch the error type of sql

Answer 2

Try this,i think it will help you some what
- (void) insertData : (NSString* ) fName : (NSString* ) lName : (NSString* ) companyName {
if(insertStatement == nil)
{
NSString* insertStatement = [NSString stringWithFormat:#"INSERT INTO nameList (userFName, userLName, userCompany) VALUES (\"%#\", \"%#\", \"%#\")", fName, lName, companyName];
NSLog(#"%#", insertStatement);
if(sqlite3_prepare_v2(database, insertSql, -1, &insertStmt, NULL) != SQLITE_OK)
NSAssert1(0, #"Error while creating insert statement. '%s'", sqlite3_errmsg(database));
}
sqlite3_bind_text(insertStatement, 1, [Gunameq UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(insertStatement, 2, [Gpassq UTF8String], -1, SQLITE_TRANSIENT);
if(SQLITE_DONE != sqlite3_step(insertStmt))
NSAssert1(0, #"Error while inserting data. '%s'", sqlite3_errmsg(database));
else
NSLog("Inserted");
//Reset the add statement.
sqlite3_reset(insertStatement);
insertStatement= nil;
- (NSArray* ) getData {
NSMutableArray* dataArray = [[NSMutableArray alloc] init];
NSString* getStatement = #"SELECT * FROM nameList";
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(databaseHandle, [getStatement UTF8String], -1, &statement, NULL) == SQLITE_OK){
// Iterate over all returned rows
while (sqlite3_step(statement) == SQLITE_ROW) {
int recordID = sqlite3_column_int(statement, 0);
NSString* fNameFromDB = [NSString stringWithUTF8String:(char*)sqlite3_column_text(statement, 1)];
NSLog(#"%#", fNameFromDB);
}
} else {
NSLog(#"No soup for you!");
}
return 0;
}
#end

Answer 3

SQLite can be a little tricky. All access to it must be from the same thread. For every prepare statement there must be a finalize statement.
There is an example project for using SQLite here you can refer to: https://github.com/AaronBratcher/ABSQLite
It has classes for accessing SQLite in a more traditional database way that I feel makes it easier.