1

複数のレコードを持つ SQLite からデータを取得する方法を誰かが共有できるかどうか疑問に思っていました。つまり、それぞれが複数のデータを持つ 5 つのフィールドを持つテーブルがあります。

NSString *str = [[NSString alloc] initWithFormat:@"%@ %@ etc...", oneString,two...];

[entry addObject:str];

最初のレコードのみを取得します

もう1つ、以下の文字列が機能します

NSString *sql = [NSString stringWithFormat:@"SELECT * FROM abc"];

しかし、これはそうではありません。クラッシュします。 

NSString *sql = [NSString stringWithFormat:@"SELECT * FROM abc WHERE name= \"john\""];
4

2 に答える 2

5 
-(NSMutableArray *)readInformationFromDatabase
{
NSMutableArray *array = [[NSMutableArray alloc] init];

// Setup the database object
sqlite3 *database;

// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
    // Setup the SQL Statement and compile it for faster access

    //SQLIte Statement 
    NSString *sqlStatement_userInfo =[NSString stringWithFormat:@"Select * from TableName"];

    sqlite3_stmt *compiledStatement;


    if(sqlite3_prepare_v2(database, [sqlStatement_userInfo UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
    {

        // Loop through the results and add them to the feeds array
        while(sqlite3_step(compiledStatement) == SQLITE_ROW)
        {
            // Init the Data Dictionary 
            NSMutableDictionary *_dataDictionary=[[NSMutableDictionary alloc] init];

            NSString *_userName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
           // NSLog(@"_userName = %@",_userName);

            NSString *_emailID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
           // NSLog(@"_emailID = %@",_emailID);

            NSString *_contactNumber = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
           // NSLog(@"_contactNumber = %@",_contactNumber);

            NSString *_address = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
           // NSLog(@"_address = %@",_address);

            NSString *_zipCode = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 4)];
           // NSLog(@"_zipCode = %@",_zipCode);

            [_dataDictionary setObject:[NSString stringWithFormat:@"%@",_userName] forKey:@"UserName"];
            [_dataDictionary setObject:[NSString stringWithFormat:@"%@",_emailID] forKey:@"EmailId"];
            [_dataDictionary setObject:[NSString stringWithFormat:@"%@",_contactNumber] forKey:@"ContactNumber"];
            [_dataDictionary setObject:[NSString stringWithFormat:@"%@",_address] forKey:@"Address"];
            [_dataDictionary setObject:[NSString stringWithFormat:@"%@",_zipCode] forKey:@"ZIPCode"];

            [array addObject:_dataDictionary]; 
        }
    }
    else
    {
        NSLog(@"No Data Found");
    }

    // Release the compiled statement from memory
    sqlite3_finalize(compiledStatement);
}

sqlite3_close(database);

return array;
}
于 2013-05-01T17:16:25.597 に答える
1

これを以下のように使用できます。

/ =============================================== ===============
データベースからデータを取得する方法 ============================ ===================================== /

-(NSMutableArray *)getData:(NSString *)query
{


//NSLog(@"QUERY : %@",query);

NSString *idToReturn=@"";
NSMutableArray *returnArray = [NSMutableArray new];
if(sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK)
{
    sqlite3_stmt *statement;
    if (sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil)==SQLITE_OK)
    {
        while(sqlite3_step(statement)==SQLITE_ROW)
        {
            NSMutableDictionary *temp= [NSMutableDictionary new];
            const char *s;



            s=(char *)sqlite3_column_text(statement, 0); // Here 0 is the first column index 
            if(s==NULL)
            {
                idToReturn=@"";
            }
            else
            {
                idToReturn =[NSString stringWithUTF8String:s];
            }
            [temp setObject:idToReturn forKey:@"firstData"];

            s=(char *)sqlite3_column_text(statement, 1);
            if(s==NULL)
            {
                idToReturn=@"";
            }
            else
            {
                idToReturn =[NSString stringWithUTF8String:s];
            }
            [temp setObject:idToReturn forKey:@"secondData"];

            s=(char *)sqlite3_column_text(statement, 2);
            if(s==NULL)
            {
                idToReturn=@"";
            }
            else
            {
                idToReturn =[NSString stringWithUTF8String:s];
            }
            [temp setObject:idToReturn forKey:@"thirdData"];

            s=(char *)sqlite3_column_text(statement, 3);
            if(s==NULL)
            {
                idToReturn=@"";
            }
            else
            {
                idToReturn =[NSString stringWithUTF8String:s];
            }
            [temp setObject:idToReturn forKey:@"forthData"];

            s=(char *)sqlite3_column_text(statement, 5);
            if(s==NULL)
            {
                idToReturn=@"";
            }
            else
            {
                idToReturn =[NSString stringWithUTF8String:s];
            }
            [temp setObject:idToReturn forKey:@"fifthData"];

            if (temp != nil)
            {
                [returnArray addObject:temp];

                temp = nil;
            }

        }
        sqlite3_finalize(statement);
        sqlite3_close(database);
    }
}
return returnArray;

}

次に、これを次のように呼び出します。

NSString *query  = [NSString stringWithFormat:@"select * from tablename"];
NSMutableArray *data = [self getData:query];

お役に立てば幸いです。

于 2013-05-01T18:26:42.650 に答える