I want to delete all data in an existing sqlite DB, this is the code i am using:
sqlite3* database;
databaseName = #"AppDB";
NSString *pathToDatabase;
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
pathToDatabase = [documentsDir stringByAppendingPathComponent:databaseName];
int databaseReturnCode = sqlite3_open([pathToDatabase UTF8String], &database);
NSLog(#"databaseReturnCode %d",databaseReturnCode);
if(databaseReturnCode == SQLITE_OK) {
const char *sql = "delete from AppDB";
sqlite3_stmt *delete_statement;
sqlite3_prepare_v2(database, sql, -1, &delete_statement, NULL);
sqlite3_bind_int(delete_statement, 1, 1);
printf( "error or not an error? : %s\n", sqlite3_errmsg(database) );
sqlite3_reset(delete_statement);
sqlite3_finalize(delete_statement);
}
sqlite3_close(database);
there are more than one field and more than one table in this DB. Please let me know what the error is. Thanks in advance.
Please comment this sqlite3_bind_int(delete_statement, 1, 1); line and run the code, Because in query you do not have any parameter which will need binding. Also I wander does this query exists? can you do like this delete from someDatabase directly? I don't think there is any query which takes database name! (I hope AppDB is table name).
[We should follow standard naming conventions for easy understanding.]
Thanks
Related
I created a table named "dept" in sqlite manually that has username (as Varchar) and Password (as Integer).
I used the following code to update a table
NSString *database2=[[NSBundle mainBundle]pathForResource:#"deptDatabase" ofType:#"sqlite"];
NSString *databasePath2=[NSString stringWithFormat:#"%#",database2];
const char *dbPath=[databasePath2 UTF8String];
if (sqlite3_open(dbPath, &dbHandler)==SQLITE_OK) {
NSLog(#"database Opened");
const char* updateQuery="update dept set password=1234 where username='suren'";
sqlite3_stmt *stmt;
if (sqlite3_prepare_v2(dbHandler, updateQuery, -1, &stmt, NULL)==SQLITE_OK) {
NSLog(#"Query Executed");
}
}
sqlite3_close(dbHandler);
but the table seems to be not updating.
Can anyone pls tell me how to update the table by altering the above code.
Thanks in advance
You can't not update fils in the mainBundle, these files are readonly.
To make changes to the database, you will have to copy it to the document directory.
And use the database in the document directory and not the one in the main bundle.
Only use the one in the main bundle as a payload file to be copied to the document directory if there is not file there.
Why do you create a new string here:
NSString *database2=[[NSBundle mainBundle]pathForResource:#"deptDatabase" ofType:#"sqlite"];
NSString *databasePath2=[NSString stringWithFormat:#"%#",database2];
The database2 is same as databasePath2. You are only using up memory here.
copy file from bundle to documents directory
NSString *databaseName = #"YOUR DB NAME WITH EXTENSION";
// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL success=[fileManager fileExistsAtPath:databasePath];
if (!success) {
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
then u can work in the path databasePath (documents directory)
const char *dbPath=[databasePath UTF8String];
if (sqlite3_open(dbPath, &dbHandler)==SQLITE_OK) {
NSLog(#"database Opened");
const char* updateQuery="update dept set password=1234 where username='suren'";
sqlite3_stmt *stmt;
if (sqlite3_prepare_v2(dbHandler, updateQuery, -1, &stmt, NULL)==SQLITE_OK) {
NSLog(#"Query Executed");
}
}
sqlite3_close(dbHandler);
hope it helps.. happy coding :)
I want to insert the data in a SQLite table login when a button is clicked, the problem is that when I click on the register button data is getting stored in variable but not in database table, and When I try to statically pass the value the data will be insert but When i trying to dynamically store data then not work.
Here is my code. Please go through it and help to solve this issue.
NSString *path;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask ,YES);
path = [paths objectAtIndex:0];
dbName = [[NSString alloc] initWithString:[path stringByAppendingPathComponent:#"mnc.sqlite"]];
NSFileManager *fileMgr = [NSFileManager defaultManager];
if([fileMgr fileExistsAtPath:dbName]== NO)
{
const char *dbPath = [dbName UTF8String];
if (sqlite3_open(dbPath,&connectionDB)==SQLITE_OK)
{
char *errMsg;
const char *sql_stmt = " create table if not exists login(user_name text ,password text)";
if (sqlite3_exec(connectionDB,sql_stmt,NULL,NULL,&errMsg))
{
printf("\n fail to create table ");
}
sqlite3_close(connectionDB);
}
else
{
NSLog(#"fail to open create database");
}
}
[fileMgr release];
if(sqlite3_prepare_v2(connectionDB, query ,-1, &statment,NULL) == SQLITE_OK)
{
sqlite3_bind_text(statment,1,"cc", -1,SQLITE_TRANSIENT);
sqlite3_bind_text(statment,2,"sa",-1,SQLITE_TRANSIENT);
NSLog(#"aadd");
}
if (sqlite3_step(statment)== SQLITE_DONE)
{
NSLog(#"This should be real error checking!");
sqlite3_finalize(statment);
}
It is quite complex to work with sqlite, thats why I use fmdb this will simplify the work.
This is an Objective-c wrapper around SQLite
Hope this helps.
I want to do insert data into sqlite..While inserting i m getting duplications in my code..i saw the questions related to it and i m getting clear about that..anyone just help me with this code to check data is present before insert into database...
- (IBAction)AddtoFavourites:(id)sender {
sqlite3 *database;
dbName=#"dataTable.sqlite";
NSArray *documentpath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentdir=[documentpath objectAtIndex:0];
dbPath=[documentdir stringByAppendingPathComponent:dbName];
if(sqlite3_open([dbPath UTF8String], &database)==SQLITE_OK){
//I want to check data it exists already into database....
NSString *sqlStatement=[NSString stringWithFormat:#"insert into Persons(PersonName,CompanyName,ImgUrl)values(\"%#\",\"%#\",\"%#\")",model.personName,model.companyName,model.imgurl];
const char *insertSQL=[sqlStatement UTF8String];
char *errMsg;
sqlite3_exec(database, insertSQL, NULL,NULL,&errMsg);
NSLog(#"Add to Favourites");
}
}
First use select query for any of column as:
const char *sqlStatement = "SELECT PersonName FROM Persons";
i guess you would have assigned sqlStatement into compiledStatement
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
[dataArray addObject:aName];
NSLog(#"%#",aName);
}
Put a check on this
-(void)initializeTableData
{
sqlite3 *db=[DatabaseTestAppDelegate getNewDBConnection];
sqlite3_stmt *statement=nil;
const char *sql="select * from WhereTo";
if (sqlite3_prepare_v2(db, sql, -1, &statement, NULL)!=SQLITE_OK)
NSAssert1(0,#"error in preparing staement",sqlite3_errmsg(db));
else {
while(sqlite3_step(statement)==SQLITE_ROW)
[tableData addObject:[NSString stringWithFormat:#"%s",(char*)sqlite3_column_text(statement,1)]];
}
sqlite3_finalize(statement);
}
at sqlite3 *db=[DatabaseTestAppDelegate getNewDBConnection]; <--- it says, DatabaseTestAppDelegate may not respond to '+getNewDbConnection'
and here is my getNewDbConnection
+(sqlite3 *) getNewDBConnection{
sqlite3 *newDBconnection;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Malacca-lah.sqlite"];
// Open the database. The database was prepared outside the application.
if (sqlite3_open([path UTF8String], &newDBconnection) == SQLITE_OK) {
NSLog(#"Database Successfully Opened :)");
}
else {
NSLog(#"Error in opening database :(");
}
return newDBconnection;
}
im new to XCode and also SQLite... been learning this for the past few weeks now, trying to get a hang on it... anyways, pls help me out with this problem. I understand the whole code but i dont understand why the inheritance has an issue.
Thanks in advance
If it says that a class may not respond to a selector, it means that it can not able to find the method declaration of the selector. Have you declared the method +(sqlite3 *)getNewDBConnection in DatabaseTestAppDelegate's header(".h") file?
i have a database that is in the documents directorys of the
Application/iPhoneSimulator/3.2/Applications/etc/Documents
I have this code under my method
databaseName = #"database.sql";
NSArray *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory.NSUserDomainMask,YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
How do i do an insert with a variable/ array .
Something like
"INSERT INTO TABLE (COLUMN) VALUES ('%#'),[appDelegate.variable objectAtIndex:0];
I insist you to go through this question.
First of all copy the database from main bundle to your application's document dir.
You can follow below code to implement it.
NSString *databaseFile=[[NSBundle mainBundle] pathForResource:kDataBaseName ofType:kDataBaseExt];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *dbPath=[basePath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.%#",kDataBaseName,kDataBaseExt]];
NSFileManager *fm=[NSFileManager defaultManager];
if(![fm fileExistsAtPath:dbPath]){
[fm copyItemAtPath:databaseFile toPath:dbPath error:nil];
}
[fm release];
self.dataBasePath=dbPath;
I am supplying you directly my project code. Please add comment if any doubts.
I have added comments for the explanation.
// function with multiple arguments which is going to be used for inserting into table.
+(void)insertBuilding:(NSString*)BName streetNo:(NSInteger)streetNo streetName:(NSString*)streetName streetDir:(NSString*)streetDir muni:(NSString*)muni province:(NSString*)province bAccess:(NSString*)bAccess bType:(NSString*)bType amnity:(NSString*)amnity latitude:(NSString*)latitude longitude:(NSString*)longitude imageName:(NSString*)imageName {
// application delegate where I have saved my database path.
BuildingLocatorAppDelegate *x=(BuildingLocatorAppDelegate *)[[UIApplication sharedApplication]delegate];
sqlite3 *database; // database pointer
// verifying if database successfully opened from path or not.
// you must open database for executing insert query
// i have supplied database path in argument
// opened database address will be assigned to database pointer.
if(sqlite3_open([[x dataBasePath] UTF8String],&database) == SQLITE_OK) {
// creating a simple insert query string with arguments.
NSString *str=[NSString stringWithFormat:#"insert into buildingDtl(b_name,streetNo,streetName,streetDir,muni,province,b_access,b_type,aminity,latitude,longitude,b_image) values('%#',%i,'%#','%#','%#','%#','%#','%#','%#','%#','%#','%#')",BName,streetNo,streetName,streetDir,muni,province,bAccess,bType,amnity,latitude,longitude,imageName];
// converting query to UTF8string.
const char *sqlStmt=[str UTF8String];
sqlite3_stmt *cmp_sqlStmt;
// preparing for execution of statement.
if(sqlite3_prepare_v2(database, sqlStmt, -1, &cmp_sqlStmt, NULL)==SQLITE_OK) {
int returnValue = sqlite3_prepare_v2(database, sqlStmt, -1, &cmp_sqlStmt, NULL);
((returnValue==SQLITE_OK) ? NSLog(#"Success") : NSLog(#"UnSuccess") );
// if NSLog -> unsuccess - that means - there is some problem with insert query.
sqlite3_step(cmp_sqlStmt);
}
sqlite3_finalize(cmp_sqlStmt);
}
sqlite3_close(database);
// please don't forget to close database.
}
+(NSString *)stringWithFormat:(NSString *)format parameters:...];
NSString sql = [NSString stringWithFormat:#"INSERT INTO table VALUES('%#')", #"Hello, world!"];
sqlite3_....
Use either prepared statements in combination with the bind_*() functions (e.g. bind_text()) or the mprintf() function to insert strings, see this question for details.
To get a raw C-string you can pass to these functions use -UTF8String or -cStringUsingEncoding: on a NSString.