I have NSMutableArray with NSMutableDictionary that carries a SQLite search result. I need to make a difference between case-sensitive and case-insensitive search. If I read some topics here, they say SQLite by default returns a case-sensitive result. And they suggest that you use COLLATE nocase to make a case-insensitive search. Actually, with the following code, I get the same result with or without COLLATE nocase. What am I doing wrong?
const char *sql;
if (checkButtonR5.state == 1) { // checkButtonR5 is a checkbox button. If it's on, it tells a search will be case-sensitive.
sql = "Select address,date,name,age,ID From data1a WHERE request LIKE ?";
} else {
sql = "Select address,date,name,age,ID From data1a WHERE request LIKE ? COLLATE nocase";
}
sqlite3_stmt *statement; // outputFile is a file path
if (sqlite3_open([outputFile UTF8String], &connection) == SQLITE_OK){
if(sqlite3_prepare_v2(connection, sql, -1, &statement, NULL) != SQLITE_OK) {
//NSLog(#"It cannot connect the database file.");
}
NSString *bindParam = [NSString stringWithFormat:#"%%%#%%",rqt];
if(sqlite3_bind_text(statement, 1, [bindParam UTF8String], -1, SQLITE_TRANSIENT) != SQLITE_OK){
//NSLog(#"Problem binding search text param.");
} else {
while (sqlite3_step(statement) == SQLITE_ROW) {
char *field0 = (char *) sqlite3_column_text(statement, 0); // address
NSString *field1Str0 = [[NSString alloc]initWithUTF8String:field0];
NSString *str0 = [[NSString alloc]initWithFormat:#"%#", field1Str0];
...
...
}
sqlite3_finalize(statement);
sqlite3_close(connection);
}
}
Thank you for your help.
Related
This section of code works great. However, there is the opportunity to pick total of 3 of five search choices. With this in mind, I would like to use UITextFields for the WHERE. For example, replace "Chain = ?" replaced with "search.text = ?". I am familiar with "WHERE Chain=\"%#\"",_somthing.text" but can't work out how to replace the hard code column header with a UITextField.
Can any body please help?
NSString *querySQL = [NSString stringWithFormat:#"SELECT FullName FROM storeDetails WHERE (Chain = ? AND Format = ? AND RegionCode = ?)"];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(detailspapav2, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_bind_text(statement, 1, [_choiceText1.text UTF8String], -1, NULL) != SQLITE_OK) {
NSLog(#"Bind 1 failed");
}
if (sqlite3_bind_text(statement, 2, [_choiceText2.text UTF8String], -1, NULL) != SQLITE_OK) {
NSLog(#"Bind 2 failed");
}
if (sqlite3_bind_text(statement, 3, [_choiceText3.text UTF8String], -1, NULL) != SQLITE_OK) {
NSLog(#"Bind 3 failed");
}
}
If you want the column name to be dynamic, change your querySQL line to something line:
NSString *querySQL = [NSString stringWithFormat:#"SELECT FullName FROM storeDetails WHERE (%# = ? AND Format = ? AND RegionCode = ?)", search.text];
However, this is dangerous. If search.text contains a value that doesn't exactly match the name of a column in your FullName table, the query will fail.
I'm inserting some data on a sqlite db, It works fine but what I noticed is that I can't insert words that contains the character ", is it a common issue? should I change parse the text and edit every " character I find?
This is the code i'm using in order to insert data into my DB:
UICollectionViewCell *cell = (UICollectionViewCell *)button.superview.superview;
NSIndexPath *indexPath = [self.customCollectionView indexPathForCell:cell];
FolderProducts *item = _feedItems[indexPath.item];
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &Carrello) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat: #"INSERT INTO CarrelloMese (titolo, codice, prezzo, urlImg) VALUES (\"%#\", \"%#\", \"%#\", \"%#\")",item.nomeProdotto, item.codice, item.prezzo, item.urlImg];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(Carrello, insert_stmt, -1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
} else {
}
sqlite3_finalize(statement);
sqlite3_close(Carrello);
}
You need to bind your SQLite statements using the sqlite3_bind_xxx() function. Basically, you remove all variables from your statement (in your case the %#) and replace them with '?'. SQLite then knows that where an ? is HAS to be a variable, and therefore doesn't get it mixed up with a command.
For example, say you wanted to bind the word "INSERT". Using ? SQLite won't read this as a command and then flag an error.
Read the docs (link above) for full information on how to use the bind function.
Here's what your code might look like with binding (UNTESTED):
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &Carrello) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat: #"INSERT INTO CarrelloMese (titolo, codice, prezzo, urlImg) VALUES (?,?,?,?)"];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(Carrello, insert_stmt, -1, &statement, NULL);
if (sqlite3_bind_text(statement, 0, item.nomeProdotto.UTF8String, item.nomeProdotto.length, SQLITE_STATIC) != SQLITE_OK) {
NSLog(#"An error occurred");
}
// Etc etc
// SQLite bind works like this: sqlite_bind_text/int/e.t.c(sqlite3_stmt,index_of_variable, value);
// there are optionally parameters for text length and copy type SQLITE_STATIC and SQLITE_TRANSIENT.
if (sqlite3_step(statement) == SQLITE_DONE)
{
} else {
}
sqlite3_finalize(statement);
sqlite3_close(Carrello);
}
I am trying to program a username/password log in view controller, there is no errors, no warnings in my app but it always output out "match not found" even when i select a username that already exist in my database..I'd really appreciate it if u could help
this is the code:
[super viewDidLoad];
NSString *docsDir;
NSArray *dirPaths;
// Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths [0];
_databasePath = [[NSString alloc]initWithString:[docsDir stringByAppendingPathComponent:#"bank.db"]];
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath:_databasePath] == NO)
{
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_bankDb) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt = " CREATE TABLE IF NOT EXISTS USER (USERNAME TEXT PRIMARY KEY, PASSWORD TEXT)";
if (sqlite3_exec(_bankDb, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
{
_status.text= #"failed to create table";
}
sqlite3_close(_bankDb);
} else {
_status.text=#"failed to open/create database";
}
}
- (IBAction)findContact:(id)sender {
const char *dbpath = [_databasePath UTF8String];
sqlite3_stmt *statement;
if (sqlite3_open(dbpath, &_bankDb) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"SELECT USERNAME, PASSWORD FROM USER WHERE USERNAME=\"%#\"", _usernameTextField.text];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(_bankDb, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *usernameField=[[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
_usernameTextField.text=usernameField;
NSString *passwordField = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1) ];
_passwordTextField.text=passwordField;
_status.text=#"match found";
} else {
_status.text=#"match not found";
}
sqlite3_finalize(statement);
}
sqlite3_close(_bankDb);
}
}
You should do the following things,
look at sqlite3_errmsg values if any queries fail (e.g. sqlite3_prepare_v2 does not return SQLITE_OK or sqlite3_step does not return either SQLITE3_DONE or SQLITE3_ROW);
Do not use stringWithFormat with your queries, but rather use ? placeholders and bind values with sqlite3_bind_text
Thus:
if (sqlite3_open(dbpath, &_bankDb) == SQLITE_OK)
{
const char *query_stmt = "SELECT USERNAME, PASSWORD FROM USER WHERE USERNAME=?";
if (sqlite3_prepare_v2(_bankDb, query_stmt, -1, &statement, NULL) != SQLITE_OK)
NSAssert(0, #"prepare failed: %s", sqlite3_errmsg(_bankDb));
if (sqlite3_bind_text(statement, 1, [_usernameTextField.text UTF8String], -1, NULL) != SQLITE_OK)
NSAssert(0, #"bind failed: %s", sqlite3_errmsg(_bankDb));
int rc = sqlite3_step(statement);
if (rc == SQLITE_ROW)
{
NSString *usernameField=[[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
_usernameTextField.text=usernameField;
NSString *passwordField = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1) ];
_passwordTextField.text=passwordField;
_status.text=#"match found";
} else if (rc == SQLITE_DONE) {
_status.text=#"match not found";
} else {
NSAssert(0, #"step failed: %s", sqlite3_errmsg(_bankDb));
}
sqlite3_finalize(statement);
sqlite3_close(_bankDb);
}
If you're still failing with match not found, you should:
examine the contents of _usernameTextField.text to make sure your IBOutlet is hooked up correctly.
look at the contents of the database and make sure a record with the desired userid is found; you haven't shown us where you add the userid, so it's hard for us to diagnose why the userid in question was not found.
I must confess that the overall logic (just looking for matching records for that userid and populating the password field if you found the userid) looks highly suspect (you shouldn't be storing passwords in plaintext, you certainly shouldn't be returning a password provided simply a userid), but I'm focusing solely on the tactical issue of why you're seeing match not found error message.
HI friends i learnt sqlite recently. i am using below code for name is exist or not in sqlite but i am not getting result. please help me.
BOOL columnExists = NO;
sqlite3_stmt *selectStmt;
NSString *upperString = [[NSString alloc] initWithFormat:exptypeFld.text];
NSString* changeString = [upperString uppercaseString];
NSLog(#"changeString %#",changeString);
[upperString release];
const char *sqlStatement = [[NSString stringWithFormat:#"SELECT expensetype from expensetypes where upper(expensetype) = '%#'",changeString] UTF8String];
NSLog(#"char is %s",sqlStatement);
if(sqlite3_prepare_v2(db, sqlStatement, -1, &selectStmt, NULL) == SQLITE_OK)
{
NSLog(#"Same........");
columnExists = YES;
}
You don't call sqlite3_step to actually execute the query. Also, is the database connection open at this point? You should also finalize the statement when you are done with it. And you shouldn't use string formats to bind values to a query. You should use sqlite3_bind_xxx.
NSString *upperString = exptypeFld.text; // no need for the string format
NSString* changeString = [upperString uppercaseString];
NSLog(#"changeString %#",changeString);
const char *sqlStatement = "SELECT expensetype from expensetypes where upper(expensetype) = ?";
NSLog(#"char is %s",sqlStatement);
sqlite3_stmt *selectStmt;
if(sqlite3_prepare_v2(db, sqlStatement, -1, &selectStmt, NULL) == SQLITE_OK) {
sqlite3_bind_text(sqlStatement, 1, [changeString UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_step(sqlStatement); // you should check the result of this too
}
sqlite3_finalize(sqlStatement);
This code assumes the database has already been opened.
You may prefer to use existing classes to access SQLite databases. You can find an example I wrote here: https://github.com/AaronBratcher/ABSQLite
It has wrapper classes for accessing SQLite in a more traditional database way that I feel makes things easier.
How can I write this query without using stringWithFormat. How can I pass parameters to the SQLite Query. Now my code is this:
NSString *querySQL = [NSString stringWithFormat:#"SELECT name, char_code, sound, status From Tmy_table Where ID=\"%d\"", i];
Thanks in advance
You should use sqlite3 host parameters and sqlite3_bind() to bind variables to them. This would like something like this in your example.
NSString* query = #"SELECT name, char_code, sound, status From Tmy_table Where ID=?";
sqlite3_stmt* myStatement = NULL;
sqlite3_prepare_v2(myDBConnection, [query UTF8String], -1, &myStatement, NULL);
sqlite3_bind_int(myStatement, 1, i);
Points to note:
The two sqlite3 functions return error codes that you must check. I've left that out for clarity.
The second parameter in sqlite3_bind_int() tells you which question mar to replace with the third parameter. The index starts at 1, not 0.
See also docs about binding.
NSString sql = #"SELECT name, char_code, sound, status From Tmy_table Where ID=?";
sqlite3_stmt *stmt = NULL;
if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &stmt, SQLITE_STATIC) == SQLITE_OK)
{
// If 'i' was text:
// if (sqlite3_bind_text(stmt, 1, i, -1, SQLITE_STATIC) == SQLITE_OK)
if (sqlite3_bind_int(stmt, 1, i) == SQLITE_OK) // Note: 1-based column when binding!!!!
{
while (sqlite3_step(stmt) == SQLITE_ROW)
{
const char *name = sqlite3_column_text(stmt, 0); // Note: 0-based column when fetching!!!
const char *sound = sqlite3_column_text(stmt, 1);
const char *status = sqlite3_column_text(stmt, 2);
// ... print the values or whatever
}
}
else
{
NSLog(#"Failed to bind int: %s", sqlite3_errmsg(database));
}
sqlite3_finalize(stmt);
}
else
{
NSLog(#"Failed to prepare statement '%#': %s", sql, sqlite3_errmsg(database));
}
EDIT Changed the bind to sqlite3_bind_text() as i appears to be text...