I break the phone you want to delete /private/var/mobile/Library/SMS/sms.db" record,
Here is my source:
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat: #"delete from message where rowid=4"];//SELECT address,text FROM message where ROWID=4
const char *query_stmt = [querySQL UTF8String];
const char *error;
int err = sqlite3_prepare_v2 (contactDB, query_stmt, -1, &statement, &error);
if (err != SQLITE_OK)
{
//NSAssert1(0, #"Error updating tables: %s", erroMsg);
}
}
and return "err=1" ,rowid=4 is exist record,"SELECT address,text FROM message where ROWID=4" is right.
please ,help me ,thx
delete a trigger in database.
delete the message
create the delete
Related
Every thing goes in code, but not saving data in SQLite db. Can any one help on this?
Find my code below:
-(IBAction)signin:(id)sender{
NSLog(#"%#",perDas.string1);
nameString=[[NSString alloc]initWithString:perDas.string1];
statusString=[[NSString alloc]initWithFormat:#"IN"];
{
NSLog(#"passed");
sqlite3_stmt *statement;
const char *dbpath = [perDas.databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSLog(#"pass");
NSString *insertSQL = [NSString stringWithFormat: #"INSERT INTO status VALUES (\"%#\", \"%#\", datetime(), \"%#\")", nameString, statusString,empString];
NSLog(#"%#",insertSQL);
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt, -1, &statement, NULL);
sqlite3_finalize(statement);
sqlite3_close(database);
}
}}
Thanks in advance
-(IBAction)signin:(id)sender{
NSArray *dirPath;
NSString *docDir;
NSString *databasePath;
dirPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docDir=[dirPath objectAtIndex:0];
databasePath=[docDir stringByAppendingPathComponent:#"YourDB.sql"];
const char *dbPath=[databasePath UTF8String];
if(sqlite3_open(dbPath, &db)==SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat: #"INSERT INTO status VALUES (\"%#\", \"%#\", datetime(), \"%#\")", nameString, statusString,empString];
const char *insertStmt=[insertSQL UTF8String];
char *errmsg=nil;
if(sqlite3_exec(db, insertStmt, NULL, NULL, &errmsg)==SQLITE_OK)
{
NSLog(#"ADDED!");
}
sqlite3_close(db);
}
}
you should check if your sql statement is correct:
if (sqlite3_prepare_v2(database, insert_stmt, -1, &statement, NULL) == SQLITE_OK) {
...
}
and if you only INSERT a subset of your row set, use this INSERT Statement form:
INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)
I have created a table with three entries name,adress and phone no.
Now i want to delete data based on the name i type in the name text field. I successfully doing this but the problem is that if I type a name which is not in my database label still show 'contact deleted '... Here is my code
-(void)deleteContact{
const char *dbPath=[databasePath UTF8String];
sqlite3_stmt *statement;
if (sqlite3_open(dbPath, &contactDB)==SQLITE_OK)
{
NSString *querySQL=[NSString stringWithFormat:#"delete from
contacts where name=\"%#\"",name.text];
const char *query_stmt=[querySQL UTF8String];
sqlite3_prepare_v2(contactDB, query_stmt,-1,&statement, NULL);
(sqlite3_step(statement)==SQLITE_OK);
status.text=#"Contact Deleted";
name.text=#"";
address.text=#"";
phone.text=#"";
sqlite3_finalize(statement);
}
sqlite3_close(contactDB);
[name resignFirstResponder];
}
Delete is OK even if there is nothing to delete.
If you need to know if there is anything to delete you should check this.
NSString *sql = [NSString stringWithFormat:#"select count (*) from contacts where name=\"%#\"", name.text];
sqlite3_stmt *stmt;
int res = sqlite3_prepare_v2(database, [sql UTF8String], -1, &stmt, NULL);
if (res != SQLITE_OK) {
NSLog(#"sqlite3_prepare_v2() failed");
return;
}
int count = 0;
if (sqlite3_step(stmt) == SQLITE_ROW) {
count = sqlite3_column_int(stmt, 0);
}
sqlite3_finalize(stmt);
if (count == 0) {
// nothing to delete, do whatever you like
} else {
// do real delete
// your code for that seems to be OK
}
delete from YourTable where name = "NameToDelete"
will delete all records with field name equal to NameToDelete from table YourTable.
I have the following code:
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select ZWAYPOINT_X, ZWAYPOINT_Y from ZWAYPOINT where ZMAP_ID %#", mapID;
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
{
// Loop through the results and add them to the Route Name array
while(sqlite3_step(compiledStatement) == SQLITE_ROW)
{
// Read the data from the result row
if((char*)sqlite3_column_text(compiledStatement, 0) != NULL)
{
NSString *xCoordinate = [NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStatement, 0)];
NSString *yCoordinate = [NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStatement, 1)];
NSLog(#"xCoordinate: %#", xCoordinate);
NSLog(#"yCoordinate: %#", yCoordinate);
CLLocationCoordinate2D coordinate = {xCoordinate, yCoordinate};
MapPin *pin = [[MapPin alloc]initWithCoordinates:coordinate
placeName:#"Keenan Stadium"
description:#"Tar Heel Football"];
[self.mapView addAnnotation:pin];
[pin release];
}
}
}
else
{
NSLog(#"Error: failed to select details from database with message '%s'.", sqlite3_errmsg(database));
}
I have a few questions:
in my SQL statement how do I include the variable mapID as part of the SQL statement
the line
CLLocationCoordinate2D coordinate = {xCoordinate, yCoordinate};
gives me the following warning "Incompatible types in initialization"
Thanks
You should use a parameterized statement and bind values, like this:
const char *sqlStatement = "select ZWAYPOINT_X, ZWAYPOINT_Y from ZWAYPOINT where ZMAP_ID = ?";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
{
sqlite3_bind_text( compiledStatement, 1, [mapID UTF8String], -1, SQLITE_TRANSIENT );
(Note that when binding parameters, you start at 1, but when reading columns from result rows, you start at 0...). I'm assuming your mapID is an NSString since you tried to stick it in your query using %#. If it's something else, you'll have to use a different bind function and obviously skip the UTF8String.
To include MapID,
Change this:
const char *sqlStatement = "select ZWAYPOINT_X, ZWAYPOINT_Y from ZWAYPOINT where ZMAP_ID %#", mapID;
To this:
const char *sqlStatement = "select ZWAYPOINT_X, ZWAYPOINT_Y, MapID from ZWAYPOINT where ZMAP_ID %#", mapID;
You get a warning creating that struct since the values are not NSString * but double.
http://developer.apple.com/iphone/library/documentation/CoreLocation/Reference/CLLocation_Class/CLLocation/CLLocation.html#jumpTo_17
I want to use sqlite3 for my iphone application. But it is not working. Scenario is :- On click event of a button a method should run and retrieve the data from the database. But My sequence of program is not going into
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
const char *sqlStatement = "select * from records";
sqlite3_stmt *compiledStatement;
0NSLog(#"%s", sqlite3_errmsg(database)); // Results - no error
-
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
//here NSLog statement does not work.
There is no problem in opening a database. What should be the reason? Any solution appreciable.
Thanks
Try this: NSLog(#"%s", sqlite3_errmsg(database)); and see if there are some errors in your query.
Here is a modified example of my own code :
NSString *file = #"youdatabase.db"
sqlite3 *db;
if(sqlite3_open([file UTF8String], &db) == SQLITE_OK)
{
NSString *req = #"SELECT * FROM totoTable";
sqlite3_stmt *returnReq;
if(sqlite3_prepare(db, [req cStringUsingEncoding:NSUTF8StringEncoding], -1, &returnReq, NULL) == SQLITE_OK)
{
while (sqlite3_step(returnReq) == SQLITE_ROW)
{
//Printf first returned value
NSLog(#"%s", (char*)sqlite3_column_text(returnReq, 0));
}
}
sqlite3_close(db);
}
Hope it will help you ;-)
I have a really frustrating error that I've spent hours looking at and cannot fix. I can get data from my db no problem with this code, but inserting or updating gives me these errors:
*** Assertion failure in +[Functions db_insert_answer:question_type:score:], /Volumes/Xcode/Kanji/Classes/Functions.m:129
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Error inserting: db_insert_answer:question_type:score:'
Here is the code I'm using:
[Functions db_insert_answer:[[dict_question objectForKey:#"JISDec"] intValue] question_type:#"kanji_meaning" score:arc4random() % 100];
//update EF, Next_question, n here
[Functions db_update_EF:[dict_question objectForKey:#"question"] EF:EF];
To call these functions:
+(sqlite3_stmt *)db_query:(NSString *)queryText{
sqlite3 *database = [self get_db];
sqlite3_stmt *statement;
NSLog(queryText);
if (sqlite3_prepare_v2(database, [queryText UTF8String], -1, &statement, nil) == SQLITE_OK) {
} else {
NSLog(#"HMM, COULDNT RUN QUERY: %s\n", sqlite3_errmsg(database));
}
sqlite3_close(database);
return statement;
}
+(void)db_insert_answer:(int)obj_id question_type:(NSString *)question_type score:(int)score{
sqlite3 *database = [self get_db];
sqlite3_stmt *statement;
char *errorMsg;
char *update = "INSERT INTO Answers (obj_id, question_type, score, date) VALUES (?, ?, ?, DATE())";
if (sqlite3_prepare_v2(database, update, -1, &statement, nil) == SQLITE_OK) {
sqlite3_bind_int(statement, 1, obj_id);
sqlite3_bind_text(statement, 2, [question_type UTF8String], -1, NULL);
sqlite3_bind_int(statement, 3, score);
}
if (sqlite3_step(statement) != SQLITE_DONE){
NSAssert1(0, #"Error inserting: %s", errorMsg);
}
sqlite3_finalize(statement);
sqlite3_close(database);
NSLog(#"Answer saved");
}
+(void)db_update_EF:(NSString *)kanji EF:(int)EF{
sqlite3 *database = [self get_db];
sqlite3_stmt *statement;
//NSLog(queryText);
char *errorMsg;
char *update = "UPDATE Kanji SET EF = ? WHERE Kanji = '?'";
if (sqlite3_prepare_v2(database, update, -1, &statement, nil) == SQLITE_OK) {
sqlite3_bind_int(statement, 1, EF);
sqlite3_bind_text(statement, 2, [kanji UTF8String], -1, NULL);
} else {
NSLog(#"HMM, COULDNT RUN QUERY: %s\n", sqlite3_errmsg(database));
}
if (sqlite3_step(statement) != SQLITE_DONE){
NSAssert1(0, #"Error updating: %s", errorMsg);
}
sqlite3_finalize(statement);
sqlite3_close(database);
NSLog(#"Update saved");
}
+(sqlite3 *)get_db{
sqlite3 *database;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *copyFrom = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"/kanji_training.sqlite"];
if([fileManager fileExistsAtPath:[self dataFilePath]]) {
//NSLog(#"DB FILE ALREADY EXISTS");
} else {
[fileManager copyItemAtPath:copyFrom toPath:[self dataFilePath] error:nil];
NSLog(#"COPIED DB TO DOCUMENTS BECAUSE IT DIDNT EXIST: NEW INSTALL");
}
if (sqlite3_open([[self dataFilePath] UTF8String], &database) != SQLITE_OK) {
sqlite3_close(database); NSAssert(0, #"Failed to open database");
NSLog(#"FAILED TO OPEN DB");
} else {
if([fileManager fileExistsAtPath:[self dataFilePath]]) {
//NSLog(#"DB PATH:");
//NSLog([self dataFilePath]);
}
}
return database;
}
+ (NSString *)dataFilePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:#"kanji_training.sqlite"];
}
I really can't work it out! Can anyone help me?
Many thanks.
in db_insert_answer, you prepare your statement
if the prepare is SQLITE_OK, you bind your variables
however, regardless of preparation OK or not, you run the statement (which could be invalid)
you also do the same thing in db_update_EF
start there
char *update = "UPDATE Kanji SET EF = ? WHERE Kanji = '?'";
Replace it with
char *update = "UPDATE Kanji SET EF = ? WHERE Kanji = ?";
It's already a string. You don't need single quotes around that question mark.