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This question already has answers here:
sqlite error database is locked
(8 answers)
Closed 6 years ago.
I am getting error Database Locked.
at first attempt it adds the row but after that i am getting the error
database locked.
I am trying to make web page saver so at first time when app loads it is adding the row but when again I try to save any webpage it is not saving and I am getting the error database locked.
Even the deletion is also not happening after saving one web page.
#import "DBManager.h"
static DBManager *sharedInstance = nil;
static sqlite3 *database = nil;
static sqlite3_stmt *statement = nil;
#implementation DBManager
+(DBManager*)getSharedInstance{
if (!sharedInstance) {
sharedInstance = [[super allocWithZone:NULL]init];
[sharedInstance createDB];
}
return sharedInstance;
}
-(BOOL)createDB{
NSString *docsDir;
NSArray *dirPaths;
// Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
// Build the path to the database file
databasePath = [[NSString alloc] initWithString:[docsDir stringByAppendingPathComponent: #"browser.db"]];
BOOL isSuccess = YES;
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: databasePath ] == NO)
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
char *errMsg;
NSLog(#"insod");
const char *sql_stmt ="create table if not exists list(sno int primary key,name varchar(50),category varchar(30),path varchar(500),fav int)";
if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)
!= SQLITE_OK)
{
isSuccess = NO;
NSLog(#"Failed to create table");
}
sqlite3_close(database);
return isSuccess;
}
else {
isSuccess = NO;
NSLog(#"Failed to open/create database");
}
}else{
NSLog(#"File Exist");
}
return isSuccess;
}
-(BOOL) Delete:(NSString *) name{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK){
NSString *query = [NSString stringWithFormat:#"delete from list where name like '%#'",name];
const char *stmt = [query UTF8String];
sqlite3_prepare_v2(database, stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE){
sqlite3_finalize(statement);
return YES;
}else {
NSLog(#"error: %s",sqlite3_errmsg(database));
sqlite3_finalize(statement);
return NO;
}
}else{
sqlite3_close(database);
return NO;
}
}
-(NSDictionary *) CatList:(NSString *) cat{
const char *dbpath = [databasePath UTF8String];
NSDictionary *dict;
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL =[NSString stringWithFormat:#"select name,path from list where category like '%#'",cat];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(database, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
// NSLog(#"inside list");
NSMutableArray *arr1 = [[NSMutableArray alloc] init];
NSMutableArray *arr2 = [[NSMutableArray alloc] init];
// NSMutableArray *arr3 = [[NSMutableArray alloc] init];
while(sqlite3_step(statement) == SQLITE_ROW)
{
NSString *name = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
[arr1 addObject:name];
//NSLog(#"%#",name);
NSString *category = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1)];
[arr2 addObject:category];
// //NSLog(#"%#",dept);
// NSString *path = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 3)];
// [arr3 addObject:path];
}
sqlite3_finalize(statement);
dict = #{#"name":arr1,#"path":arr2};
//NSLog(#"%#",dict);
}else{
NSLog(#"error: %s",sqlite3_errmsg(database));
}
sqlite3_close(database);
}
return dict;
}
- (BOOL) saveData:(NSString*)name category:(NSString*)category path:(NSString*)path{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *highest = #"select max(sno) from list";
const char *Query = [highest UTF8String];
if (sqlite3_prepare_v2(database, Query, -1, &statement, NULL) == SQLITE_OK){
if (sqlite3_step(statement) == SQLITE_ROW){
int sno = sqlite3_column_int(statement, 0);
NSString *insertSQL = [NSString stringWithFormat:#"insert into list values(\"%d\",\"%#\",\"%#\", \"%#\",\"%d\")",sno+1,name, category, path,0];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE){
sqlite3_finalize(statement);
return YES;
}else {
sqlite3_finalize(statement);
return NO;
}
}else{
NSString *insertSQL = [NSString stringWithFormat:#"insert into list values(\"%d\",\"%#\",\"%#\", \"%#\",\"%d\")",1,name, category, path,0];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE){
sqlite3_finalize(statement);
return YES;
}else {
sqlite3_finalize(statement);
return NO;
}
}
}
sqlite3_close(database);
}
return NO;
}
-(BOOL) Fav:(NSString *) name{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK){
NSString *query = [NSString stringWithFormat:#"update list set fav = 1 where name like '%#'",name];
const char *stmt = [query UTF8String];
sqlite3_prepare_v2(database, stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE){
sqlite3_finalize(statement);
return YES;
}else {
sqlite3_finalize(statement);
return NO;
}
}else{
return NO;
}
}
-(NSArray *) GetListFav{
const char *dbpath = [databasePath UTF8String];
NSArray *dict;
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = #"select name from list where fav = 1";
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(database, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
NSMutableArray *arr1 = [[NSMutableArray alloc] init];
while(sqlite3_step(statement) == SQLITE_ROW)
{
NSString *name = [[NSString alloc] initWithUTF8String: (const char *) sqlite3_column_text(statement, 0)];
[arr1 addObject:name];
}
sqlite3_finalize(statement);
dict = arr1;
}else{
NSLog(#"error: %s",sqlite3_errmsg(database));
}
sqlite3_close(database);
}
return dict;
}
-(BOOL) removeFav:(NSString *) name{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK){
NSString *query = [NSString stringWithFormat:#"update list set fav = 0 where name like '%#'",name];
const char *stmt = [query UTF8String];
sqlite3_prepare_v2(database, stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE){
sqlite3_finalize(statement);
return YES;
}else {
sqlite3_finalize(statement);
return NO;
}
}else{
return NO;
}
}
-(NSArray *) GetList{
const char *dbpath = [databasePath UTF8String];
NSArray *dict;
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = #"select name from list";
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(database, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
//NSLog(#"inside list");
NSMutableArray *arr1 = [[NSMutableArray alloc] init];
while(sqlite3_step(statement) == SQLITE_ROW)
{
NSString *name = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
[arr1 addObject:name];
}
sqlite3_finalize(statement);
dict = arr1;
}else{
NSLog(#"error: %s",sqlite3_errmsg(database));
}
sqlite3_close(database);
}
return dict;
}
#end
You can only access sqllite once at a time. If you have multiple threads, you can run in this situation. Example:
So always try to close database once it is used using:
sqlite3_close(database);
You need to make sure every sqlite3_open is balanced with a sqlite3_close before trying to do sqlite3_open again:
Your saveData method has quite a few return statements that will prevent the database from ever calling sqlite3_close. Make sure all paths out of the method close the database properly. In the end, this means that you'll try to open the database although it's already open.
Or, better, just open the database once and leave it open, eliminating the repeated opening and closing of the database.
Your Delete, Fav, and removeFav methods are also not closing the database.
A few unrelated observations:
You should be wary about using stringWithFormat to build SQL with string parameters. If the string being searched for had a apostrophe in it, your code will fail. Use ? placeholders and then use sqlite3_bind_text to bind values to those placeholders.
If you make your sno column a AUTOINCREMENT, you won't have to do that "get the max sno before inserting new row" logic. Thus, the CREATE statement might look like:
create table if not exists list (
sno integer primary key autoincrement,
name text,
category text,
path text,
fav integer)
You can then omit sno from the INSERT statements, and it will automatically be assigned a unique identifier.
This question already has an answer here:
when to call SQLite cleanup functions?
(1 answer)
Closed 6 years ago.
I have used sqlite database in my app.I am doing CURD operation.I get data from json then i convert that data into arrays after that from arrays i insert the data into sqlite database.In my app when data can be upto more than 1000 records.When database is done then i get memory warning.
I have one function for Inserting data.It firstly check if data exists then update data else insert new record
[[DBManager getSharedInstance]insertData:object];
Function definition -
(BOOL) insertData:(SubComponent *)subcomponent
{
const char *dbpath = [databasePath UTF8String];
if([self getSubComponentDataBySubclientClientInspectionid:subcomponent.componentid : subcomponent.componentsubclientid:subcomponent.componentClientid : subcomponent.componentinspectionid] != nil)
{
[self updateCompSubComponentDataBySubclientId:subcomponent];
return YES;
}
else
{
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
if (sqlite3_exec(database, [#"PRAGMA CACHE_SIZE=500000;" UTF8String], NULL, NULL, NULL) == SQLITE_OK) {
NSLog(#"Successfully changed cache size");
}
else
NSLog(#"Error: failed to set cache size with message %s.", sqlite3_errmsg(database));
NSLog(#"inside isnert query");
NSString *insertSQL = [NSString stringWithFormat:
#"insert into subcomponent(subcomponentid,name,createddate,subclientid,clientid,cliententityid, inspectionid, initialstatus,componentclientname,componentsubclientname, checkedstatus) values (\"%#\",\"%#\",\"%#\",\"%#\",\"%#\",\"%#\",\"%#\",\"%ld\",\"%#\",\"%#\",\"2\")",subcomponent.componentid,subcomponent.componentName,subcomponent.componentcreateddate,subcomponent.componentsubclientid,subcomponent.componentClientid, subcomponent.componentEntityid,subcomponent.componentinspectionid,(long)subcomponent.componentStatus,subcomponent.componentClientName,subcomponent.componentSubclientName];
NSLog(#"%#",insertSQL);
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
sqlite3_finalize(statement);
return YES;
}
else
{
NSLog(#"REMASH DB ERROR %s",sqlite3_errmsg(database));
// sqlite3_reset(statement);
//sqlite3_close(database);
sqlite3_finalize(statement);
return NO;
}
}
sqlite3_close(database);
}
return YES;
}
GET DATA FUNCTION
- (SubComponent*) getSubComponentDataBySubclientClientInspectionid:(NSString*)componentid : (NSString *)subclientid : (NSString *)clientId : (NSString *)inspectionid
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"select * from subcomponent where subcomponentid = \"%#\" and subclientid = \"%#\" and clientid = \"%#\" and inspectionid = \"%#\"",componentid,subclientid, clientId,inspectionid];
NSLog(#"gghgh query is %#",querySQL);
const char *query_stmt = [querySQL UTF8String];
SubComponent *resultArray = [[SubComponent alloc]init];
if (sqlite3_prepare_v2(database,query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *component_id = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 0)];
resultArray.componentid = component_id;
NSString *name = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 1)];
resultArray.componentName = name;
NSString *createddate = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 2)];
resultArray.componentcreateddate = createddate;
NSString *subclientid = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 3)];
resultArray.componentsubclientid = subclientid;
NSString *clientid = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 4)];
resultArray.componentClientid = clientid;
NSString *entityid = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 5)];
resultArray.componentEntityid = entityid;
NSString *inspectionid = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 6)];
resultArray.componentinspectionid = inspectionid;
NSString *clientName = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 8)];
resultArray.componentClientName = clientName;
NSString *subclientName = [[NSString alloc]initWithUTF8String:(const char *) sqlite3_column_text(statement, 9)];
resultArray.componentSubclientName = subclientName;
// sqlite3_finalize(statement);
// sqlite3_close(database);
return resultArray;
}
else
{
// sqlite3_finalize(statement);
// sqlite3_close(database);
return nil;
}
}
else
{
NSLog(#"error is %s",sqlite3_errmsg(database));
}
}
// sqlite3_reset(statement);
// sqlite3_finalize(statement);
sqlite3_close(database);
return nil;
}
Update Function
-(void)updateCompSubComponentDataBySubclientId:(SubComponent *)subcomponent
{
NSLog(#"inside update data");
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
if (sqlite3_exec(database, [#"PRAGMA CACHE_SIZE=500000;" UTF8String], NULL, NULL, NULL) == SQLITE_OK) {
NSLog(#"Successfully changed cache size");
}
else
NSLog(#"Error: failed to set cache size with message %s.", sqlite3_errmsg(database));
NSString *querySql=[NSString stringWithFormat:
#"UPDATE subcomponent SET name=\"%#\", createddate=\"%#\", cliententityid =\"%#\",componentclientname=\"%#\", componentsubclientname = \"%#\", checkedstatus = \"2\" where subcomponentid = \"%#\" and subclientid = \"%#\" and clientid = \"%#\" and inspectionid =\"%#\"",subcomponent.componentName,subcomponent.componentcreateddate, subcomponent.componentEntityid,subcomponent.componentClientName,subcomponent.componentSubclientName,subcomponent.componentid, subcomponent.componentsubclientid,subcomponent.componentClientid,subcomponent.componentinspectionid];
const char *sql=[querySql UTF8String];
if(sqlite3_prepare_v2(database,sql, -1, &statement, NULL) == SQLITE_OK)
{
if(SQLITE_DONE != sqlite3_step(statement))
{
NSLog(#"REMASH Error while updating. '%s'", sqlite3_errmsg(database));
}
else
{
//sqlite3_reset(statement);
NSLog(#"Update done successfully!");
}
}
NSLog(#"NOT OK");
sqlite3_finalize(statement);
sqlite3_close(database);
}
}
PS:Can somebody suggest whether use of sqlite_finilaize(),sqlite_close().sqlite_reset() is correct by seeing my code.Because memory is increasing.
This is not a Database issue.
This issue is caused because Application doesn't have a storyboard for the device you are trying to run upon.
XCode no valid compiled storyboard at path
HERE IS MY CODE:
NSString *ask = [NSString stringWithFormat:#"SELECT name FROM users"];
sqlite3_stmt *statement;
const char *query_statement = [ask UTF8String];
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_DB) == SQLITE_OK){
{
if (sqlite3_prepare_v2(_DB, query_statement, -1, &statement, nil) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *nameField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 0)];
}
sqlite3_finalize(statement);
sqlite3_close(_DB);
}
}
I want to set those result above to NSMUtableArray like this example:
totalStrings =[[NSMutableArray alloc]initWithObjects:#"xxx",#"xxx",#"xxx", nil];
What should I do ?
=================UP DATE ALL CODE =======================
Here is the aditonal code to make it easy to see. I really don´t know what I have done wrong.
#interface ViewController ()
{
NSMutableArray *totalStrings;
NSMutableArray *filteredStrings;
BOOL isFiltered;
}
#property(strong, nonatomic)NSMutableArray *entries;
#end
#implementation ViewController;
#synthesize entries;
- (void)viewDidLoad {
// totalStrings =[[NSMutableArray alloc]initWithObjects:#"ggg",#"gggggg", nil];
// NSLog(#"%#",totalStrings);
NSMutableArray* result=[[NSMutableArray alloc] init];
NSString *ask = [NSString stringWithFormat:#"SELECT * FROM users"];
sqlite3_stmt *statement;
const char *query_statement = [ask UTF8String];
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_DB) == SQLITE_OK){
{
if (sqlite3_prepare_v2(_DB, query_statement, -1, &statement, nil) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *nameField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 0)];
//add your namefield here.
[result addObject:nameField];
totalStrings=[[NSMutableArray alloc] initWithArray:result];
}
sqlite3_finalize(statement);
sqlite3_close(_DB);
}
}
NSLog(#"%#",totalStrings);
//AND PUT THOSE RESULTS INTO THIS ARRAY ( I WILL USE THIS LATER)
//I want it to be this format: totalStrings=[[NSMutableArray alloc]initWithObjects:#"test1",#"test2",#"test3", nil];
}
The code below should work in case you want to get all namefields in array
NSMutableArray* result=[[NSMutableArray alloc] init];
NSString *ask = [NSString stringWithFormat:#"SELECT name FROM users"];
sqlite3_stmt *statement;
const char *query_statement = [ask UTF8String];
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_DB) == SQLITE_OK){
{
if (sqlite3_prepare_v2(_DB, query_statement, -1, &statement, nil) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *nameField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 0)];
//add your namefield here.
[result addObject:nameField];
}
sqlite3_finalize(statement);
sqlite3_close(_DB);
}
}
In the end you can do
totalStrings=[[NSMutableArray alloc] initWithArray:result];
Create and Alloc New NSMutableArray totalStrings and add nameField in the totalStrings in While Loop.
NSMutableArray *totalStrings = [[NSMutableArray alloc] init];
In while loop
[totalStrings addObject:nameField];
You can get it like this,
-(NSArray *)list_totalStrings
{
NSMutableArray *totalStrings = [[NSMutableArray alloc] init];
NSString *ask = [NSString stringWithFormat:#"SELECT name FROM users"]; //Make sure field and table names are proper
sqlite3_stmt *statement;
const char *query_statement = [ask UTF8String];
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_DB) == SQLITE_OK){
if (sqlite3_prepare_v2(_DB, query_statement, -1, &statement, nil) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *nameField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 0)];
[totalStrings addObject:nameField];
}
sqlite3_finalize(statement);
sqlite3_close(_DB);
NSLog(#"%#",totalStrings);
return totalStrings;
}
else
return nil;
}
else
return nil;
}
Right now I am inserting into the db on the basis of count. If count is greater than zero than "SELECT" will run and my data will be shown, else "INSERT" will take place. Right now my db is empty so the condition goes to "INSERT" section and in that I am getting "Database is Locked:ERROR". i have gone through some examples and it said like we have to finalize the curent query before starting the new one. I have done that thing too but still my problem is same. Posting my code here :
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:
#"SELECT count(*) FROM tables WHERE table_id='%d'",
table_id];
NSLog(#"fetch query is.... %#",querySQL);
const char *query_stmt = [querySQL UTF8String];
sqlite3_stmt *countstmt;
if(sqlite3_prepare_v2(_contactDB, query_stmt, -1, &countstmt, NULL) == SQLITE_OK)
{
NSLog(#"FEtch");
sqlite3_step(countstmt);
rows = sqlite3_column_int(countstmt, 0);
NSLog(#"no of rows is %d",rows);
}
sqlite3_finalize(statement);
}
if(rows>0)
{
NSLog(#"NO of rows is : %d",rows);
//if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
// {
NSString *querySQQL = [NSString stringWithFormat:
#"SELECT * FROM tables WHERE table_id='%d'",
table_id];
NSLog(#"fetch query is.... %#",querySQQL);
const char *query_stmmt = [querySQQL UTF8String];
if (sqlite3_prepare_v2(_contactDB,
query_stmmt, -1, &statement, NULL) == SQLITE_OK)
{
NSLog(#"yes...");
}
while (sqlite3_step(statement) == SQLITE_ROW)
{
//int i=0;
NSLog(#"yesssss...");
// NSInteger count = sqlite3_column_int(statement, 2);
//NSLog(#"Rowcount is %d",(long)count);
table_data= [[NSString alloc]
initWithUTF8String:(const char *) sqlite3_column_text(statement, 1)];
status= [[NSString alloc]
initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
row_id= [[NSString alloc]
initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
table_idd= [[NSString alloc]
initWithUTF8String:(const char *) sqlite3_column_text(statement, 3)];
//searchResults = [NSMutableArray arrayWithObject:namee];
NSString *finalarrayy;
//for(loop=1;loop<=z;loop++)
//{
finalarrayy=[NSString stringWithFormat:#"%#,%#,%#,%#",row_id,table_data,status,table_idd];
[stringArray addObject:table_data];
NSLog(#"Array....is...%#",stringArray);
}
[defaults setObject:stringArray forKey:#"stringarray"];
[defaults synchronize];
//}
sqlite3_finalize(statement);
}
else{
NSLog(#"INsert");
//if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
// {
for(i=mn; i<=o ; i++)
{
for(j=1;j<=19;j++)
{
k=i*j;
NSString *val=[NSString stringWithFormat:#"%d %# %d %# %d",i,#"x",j,#"=",k];
//tab_data.value=val;
[stringArray addObject:val];
NSString *insertSQLL = [NSString stringWithFormat:
#"INSERT INTO tables(table_data,status,table_id) VALUES ('%#', '%#', '%d')",
val,#"NO",table_id];
NSLog(#"sql stm. is ..%#",insertSQLL);
const char *insert_stmtt = [insertSQLL UTF8String];
sqlite3_prepare_v2(_contactDB, insert_stmtt,
-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
NSLog(#"yes");
}
else
{
NSLog(#"Error: failed to insert into the database with message '%s'.", sqlite3_errmsg(_contactDB));
}
}
}
// }
sqlite3_finalize(statement);
sqlite3_close(_contactDB);
}
PLease tell me what is wrong with my code. The code is running for the first time like if nothing is in the database then values are inserting into the db but for the second time if I want to insert something new into the db then its throwing error"database is locked".Actually I am running the same code in viewdidload and on the action of segmentcontrol. For viewdidload it is running fine but in the case of segmentcontrol it is creating error, any idea regarding this. If someone can modify my code I will be very thankful to him/her.
you must always close the sqlite database after using it ... so add this line sqlite3_close(DB); just after sqlite3_finalize(statement);
We have declared the following code in the default ViewController.m:
-(void)saveData{
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:
#"INSERT INTO CONTACTS (name, address, phone) VALUES (\"%#\", \"%#\", \"%#\")",
name.text, address.text, phone.text];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(contactDB, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
name.text = #"";
address.text = #"";
phone.text = #"";
sqlite3_finalize(statement);
sqlite3_close(contactDB);
}
}
}
-(void)findContact{
const char *dbpath = [databasePath UTF8String];
sqlite3_stmt *statement;
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"SELECT address, phone FROM contacts WHERE name=\"%#\"", name.text];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(contactDB, query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *addressField = [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 0)];
address.text = addressField;
NSString *phoneField = [[NSString alloc]
initWithUTF8String:(const char *)
sqlite3_column_text(statement, 1)];
phone.text = phoneField;
status.text = #"Match found";
} else {
status.text = #"Match not found";
address.text = #"";
phone.text = #"";
}
sqlite3_finalize(statement);
}
sqlite3_close(contactDB);
}
}
-(void)viewDidLoad{
[super viewDidLoad];
NSString *docsDir;
NSArray *dirPaths;
dirPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir=[dirPaths objectAtIndex:0];
databasePath=[[NSString alloc]initWithString:[docsDir stringByAppendingPathComponent:#"contacts.db"]];
NSFileManager *filemgr=[NSFileManager defaultManager];
if([filemgr fileExistsAtPath:databasePath]==NO)
{
const char *dbpath=[databasePath UTF8String];
if(sqlite3_open(dbpath, &contactDB)==SQLITE_OK)
{
char *errMsg;
const char *sql_stmt =
"CREATE TABLE IF NOT EXISTS CONTACTS (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, ADDRESS TEXT, PHONE TEXT)";
if (sqlite3_exec(contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
{
status.text = #"Failed to create table";
}
sqlite3_close(contactDB);
} else {
status.text = #"Failed to open/create database";
}
}
}
It works, but we want to access to that database (contactDB) from different viewControllerName.m ; we have tried the following:
// Scene2ViewController.m
-(void)incrementoBarra {
if (barra.progress == 1) {
//In this method we want to insert the address data into the specified name.
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:
#"INSERT INTO CONTACTS (name, address) VALUES (\"%#\", \"%d\")",
usuario, tiempo];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(contactDB, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
sqlite3_finalize(statement);
sqlite3_close(contactDB);
}
}
//
[self performSelector:#selector(hideImage) withObject: nil afterDelay:1.0];
}
}
It didn´t work due to errors with the variables and the database as these were not well declared
How do we have to implement those variables and database to work with them from different .m?
Thank you for your time!
I think to this question there are allot of answers, so i'll just explain the one i would be going for, and try to explain why. Here goes!
Since you've got similar logic that you want to use in different locations (in this case multiple files), i would move this logic to a new class (.h and .m file for implementation). Considering it's logic that interacts with the database i would go ahead and name it "DatabaseManager". This class should now give you access to the logic you'd need.
To make sure you're always able to acces DatabaseManager, it might be smart to make it a Singleton (see http://en.m.wikipedia.org/wiki/Singleton_pattern).