SQLiteの問題：sqlite3_open（[databasePath UTF8String]、＆database）== SQLITE_OK）が機能しない

Question

-(void)myDatabaseFunction 
{ 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"HHAuditToolDatabase.sqlite"]; 
if (sqlite3_open([writableDBPath UTF8String], &database) == SQLITE_OK){ 
NSLog(@"opening db"); 
NSString *keyValue; 
NSString *sqlStr = @"SELECT * FROM HHAuditTable"; 
//following if() not working dude!!!! 
//its working with !=SQLITE_OK  
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { 

sqlite3_stmt *addStmt = nil; 

if(sqlite3_prepare_v2(database,[sqlStr UTF8String], -1, &addStmt, NULL) != SQLITE_OK){ 
    NSLog(@"%@",sqlStr); 
    while (sqlite3_step(addStmt) == SQLITE_ROW) { 


const unsigned char *querry_returns = sqlite3_column_text(addStmt, 0); 
     keyValue = [[NSString alloc]initWithUTF8String:(char *) sqlite3_column_text(addStmt, 0)]; 
     } 

     NSLog(@"value from DB = %@",keyValue); 

コメント付きのif（）は機能しません。私は最後の3時間それをしています.... solnを持って来てください

Answer 1

ヘイ、あなたはその作業罰金は私のために私のコードを使用することができます -

(void)myDatabaseFunction { 

NSFileManager *fileManager = [NSFileManager defaultManager]; 
NSError *error; 
dbPath = [self getDBPath]; 
BOOL success = [fileManager fileExistsAtPath:dbPath]; 

if(!success) { 

    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"flipsy.sqlite"]; 
    success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error]; 

    if (!success) 
     NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]); 

} 
NSString *sql = @"SELECT * FROM HHAuditTable"; 
NSInteger *intvalue; 
    result = [[NSMutableArray alloc] init]; 
    // NSLog(@"sql--------->%@",sql); 
    const char *sqlStatement = [sql UTF8String]; 

//if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) { 

    if(sqlite3_prepare_v2(database, sqlStatement, -1, &selectstmt , NULL)!= SQLITE_OK) { 
    } 

    else { 

     //NSLog(@"%@",dataTypeArray); 

     for(int i=0;i<[dataTypeArray count];i++) { 
      temp = [[NSMutableArray alloc] init]; 
      [result addObject:temp]; 
      // [temp release]; 
     } 
     while(sqlite3_step(selectstmt) == SQLITE_ROW) { 

      for(int i=0;i<[dataTypeArray count];i++) { 

       switch([[dataTypeArray objectAtIndex:i] integerValue]) { 

        case 0: 
         intvalue = (NSInteger *)sqlite3_column_int(selectstmt,i); 
         strvalue = [NSString stringWithFormat:@"%d",intvalue]; 
         [[result objectAtIndex:i] addObject:(NSNumber *)strvalue]; 


         break; 

        case 1: 
         [[result objectAtIndex:i] addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, i)]]; 
         break; 

        case 2: 

         blob = [[NSData alloc] initWithBytes:sqlite3_column_blob(selectstmt, i) length:sqlite3_column_bytes(selectstmt, i)]; 
         [[result objectAtIndex:i] addObject:blob]; 
         [blob autorelease]; 
         break; 


        default: 
         defaultValue=[NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, i)]; 
         break; 

        }//switch 

      }//for(int i=0;i<[dataTypeArray count];i++) 

     }//while(sqlite3_step(selectstmt) == SQLITE_ROW) 

    //}//else 

    //sqlite3_close(database); 
    sqlite3_finalize(selectstmt); 
    [temp release]; 

}//if (sqlite3_open([dbPath UTF 

} 

- (NSString *) getDBPath { 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES); 
NSString *documentsDir = [paths objectAtIndex:0]; 
return [documentsDir stringByAppendingPathComponent:@"flipsy.sqlite"]; 
} 

私はちょうど彼が二度それを開いた理由を尋ねるつもりだった任意の明確化が

Answer 2

あなたはデータベースを2回開いています。データベース接続を終了してから、データベースを再度開く必要があります。それが働いていない理由です。