sqlite iphone sdk的幫助？

Question

我正在閱讀sqlite，但無法獲取數據，而是顯示nil值。請參考給定的代碼....

-(void)getDatabasePath:(NSString *)dBPath sqlCatagoryId:(NSString *)catId { 
    if(sqlite3_open([dBPath UTF8String], &_database) == SQLITE_OK) { 
     NSLog(@"database path %@", dBPath); 
NSString *sqlStatement = [NSString stringWithFormat:@"SELECT * FROM SubCategories where CAT_ID = '%@'",catId]; 

NSString *aCategoryId, *aSubCategoryId, *aSubCategoryName, *aSubCategoryDescription; 
sqlite3_stmt *statement; 
    if (sqlite3_prepare_v2(_database, [sqlStatement UTF8String], -1, &statement, nil) 
== SQLITE_OK) { 
     while (sqlite3_step(statement) == SQLITE_ROW) { 

      char * str1 = (char *)sqlite3_column_text(compiledStatement, 1); 
      if (str1) { 
       aCategoryId = [NSString stringWithUTF8String:str1]; 
      } 
      else { 
       aCategoryId = @""; 
      } 
      char * str2 = (char *)sqlite3_column_text(compiledStatement, 2); 
      if (str1) { 
       aSubCategoryId = [NSString stringWithUTF8String:str2]; 
      } 
      else { 
       aSubCategoryId = @""; 
      } 
      char * str3 = (char *)sqlite3_column_text(compiledStatement, 3); 
      if (str1) { 
       aSubCategoryName = [NSString stringWithUTF8String:str3]; 
      } 
      else { 
       aSubCategoryName = @""; 
      } 
      char * str4 = (char *)sqlite3_column_text(compiledStatement, 4); 
      if (str1) { 
       aSubCategoryDescription = [NSString stringWithUTF8String:str4]; 
      } 
      else { 
       aSubCategoryDescription = @""; 
      } 

      NSData *aSubCategoryImage; 
      NSUInteger blobLength = sqlite3_column_bytes(compiledStatement, 5); 
      if(blobLength > 0){ 
       aSubCategoryImage = [NSData dataWithBytes:sqlite3_column_blob(compiledStatement, 5) length:blobLength]; 
      } 
      else { 
       aSubCategoryImage = nil; 
      } 

      SubCategoryModel *subCategoryModel = [[SubCategoryModel alloc] initWithCategoryId:aCategoryId subCategoryId:aSubCategoryId subCategoryName:aSubCategoryName subCategoryDescription:aSubCategoryDescription subCategoryImage:aSubCategoryImage];// database:database 
      //Add the details object to the Array 
      [subCategorryArray addObject:subCategoryModel]; 
       [subCategoryModel release]; 
     } 
sqlite3_finalize(statement); 
    } 
    } 
    [self.aTableView reloadData]; 
} 

請指出我要去哪裏錯或爲什麼我無法從sqlite中獲取數據。感謝

Answer 1

我做錯了在sqlite3_stmt *statement;和sqlite3_stmt * compiledStatement; 我混的都sqlite3_stmt