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내 앱에서 SQLite 데이터베이스를 사용하여 데이터를 저장하고 있습니다. 여기 샘플 코드 내 메인 클래스의 SQLite DB 테이블에 데이터 삽입
우리가 삽입 할 롤 번호가 이미있는 경우이 방법은 검사를위한
-(IBAction)insertButtonAction:(id)sender
{
BOOL isRollNum;
Database *db = [[Database alloc]init];
if ([rollNumberTxtFld.text length]>0)
{
isRollNum = [db checkForRollNumber:rollNumberTxtFld.text];
if (isRollNum == YES)
{
UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Student with specified roll number already available" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[errorAlert show];
}
else
{
if ([nameTxtFld.text length]>0 && [rollNumberTxtFld.text length]>0 )
{
NSString *name = nameTxtFld.text;
NSString *num = rollNumberTxtFld.text;
int age = [ageTxtFld.text intValue];
NSString *address1 = address1TxtFld.text;
NSString *address2 = address2TxtFld.text;
NSString *mobile = mobileTxtFld.text;
NSString *class =classTxtFld.text;
NSLog(@"%@ %@ %d %@ %@ %@ %@ ",name,num,age,address1,address2,mobile,class);
NSString* insert_stmt = NULL;
insert_stmt = [NSString stringWithFormat:@"insert into friends(name,rollnumber,age,address1,address2,mobile,class) values('%@', '%@', '%d', '%@', '%@', '%@', '%@')",name,num,age,address1,address2,mobile,class,nil ];
Database *db = [[Database alloc]init];
BOOL inserted = [db insertIntoDB:insert_stmt];
if (inserted == YES)
{
insertReenterAlert = [[UIAlertView alloc] initWithTitle:@"Success" message:@"Inserted" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[insertReenterAlert show];
}
else
{
insertReenterAlert = [[UIAlertView alloc] initWithTitle:@"Failed" message:@"Not Inserted" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[insertReenterAlert show];
}
}
else
{
insertReenterAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@" Please enter required fields and try again." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[insertReenterAlert show];
}
}
}
else
{
insertReenterAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@" Please enter required fields and try again." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[insertReenterAlert show];
}
}
을 다음과 같이 이러한 메서드를 호출하고 데이터
를 삽입하기 위해 사용하고있다 또는 DB 테이블에 없습니다.-(BOOL)checkForRollNumber:(NSString *) num
{
rollNumberArray = [[NSMutableArray alloc] init];
NSFileManager *fileManager = [NSFileManager defaultManager];
dbPath = [[NSBundle mainBundle]pathForResource:@"FriendsList"ofType:@"sqlite"];
NSLog(@"dbPath %@",dbPath);
BOOL success = [fileManager fileExistsAtPath:dbPath];
int rowCount = 0;
if (success)
{
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK)
{
const char* sqlStatement = "SELECT COUNT(rollnumber) FROM friends ";
sqlite3_stmt* statement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &statement, NULL) == SQLITE_OK)
{
if(sqlite3_step(statement) == SQLITE_ROW)
rowCount = sqlite3_column_int(statement, 0);
}
else
{
NSLog(@"Failed from sqlite3_prepare_v2. Error is: %s", sqlite3_errmsg(database));
}
sqlite3_finalize(statement);
sqlite3_close(database);
}
}
NSLog(@"rowCount %d",rowCount);
if (success)
{
if(sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK)
{
const char *selectSQL = "SELECT rollnumber FROM friends";
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, selectSQL, -1, &statement, NULL) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
for (int i=0; i<rowCount; i++)
{
NSLog(@"i %d",i);
NSString *str = [NSString stringWithUTF8String:(char *) sqlite3_column_text(statement, 0)];
[rollNumberArray addObject:str];
NSLog(@"rollNumberArray: %@",[rollNumberArray objectAtIndex:i]);
}
}
for (int i=0; i<[rollNumberArray count]; i++)
{
NSLog(@"[rollNumberArray objectAtIndex:%d] %@ == num %@",i,[rollNumberArray objectAtIndex:i],num);
if ([[rollNumberArray objectAtIndex:i] intValue] == [num intValue])
{
NSLog(@"FOUND");
return YES;
}
else
{
NSLog(@"NOT FOUND");
return NO;
}
}
}
else
{
NSLog(@"Statement Not Prepared");
return NO;
}
sqlite3_finalize(statement);
}
else
{
NSLog(@"Database Not Opened");
return NO;
}
sqlite3_close(database);
}
else
{
NSLog(@"File Not Opened");
return NO;
}
}
이는
-(BOOL) insertIntoDB :(NSString *) insert_stmt
{
NSFileManager *fileManager = [NSFileManager defaultManager];
dbPath = [[NSBundle mainBundle]pathForResource:@"FriendsList"ofType:@"sqlite"];
NSLog(@"dbPath %@",dbPath);
BOOL success = [fileManager fileExistsAtPath:dbPath];
if (success)
{
if(sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK)
{
const char *insertSQL = [insert_stmt UTF8String];
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, insertSQL, -1, &statement, NULL) == SQLITE_OK) //**Always not entering into this if**
{
if (sqlite3_step(statement) == SQLITE_DONE)
{
NSLog(@"Succesfully added in DB");
return YES;
}
else
{
NSLog(@"Not added in DB");
return NO;
}
}
else
{
NSLog(@"Statement Not Prepared");
return NO;
}
sqlite3_finalize(statement);
}
else
{
NSLog(@"Database Not Opened");
return NO;
}
sqlite3_close(database);
}
else
{
NSLog(@"File Not Opened");
return NO;
}
}
그것은 (베이스, selectSQL, -1, & 성명, NULL) == SQLITE_OK이 조건 sqlite3_prepare_v2 만족되지 않는 테이블에 데이터를 삽입하는 방법) 처음 값만 추가됩니다. 누구든지 나를 도울 수 있습니다.
미리 감사드립니다.
NSLOG로 표시 할 DB의 경로를 확인하십시오. 맞습니까? –
CoreData 사용을 고려하십니까? – Devraj
그리고 준비가 실패하면 sqlite3_errmsg (database)는 무엇을보고합니까? – Rob