IOS之数据库的查找，删除，添加，更新(4)

   
    int result = sqlite3_prepare(db, "select * from classDB where name = ?", -1, &stmt, nil);
    NSMutableArray *persons = nil;
    if (result == SQLITE_OK)
    {
        sqlite3_bind_text(stmt, 1, [name UTF8String], -1, nil);
       
        persons = [[NSMutableArray alloc]init];
        while (sqlite3_step(stmt) == SQLITE_ROW)
        {
            int ID = sqlite3_column_int(stmt, 0);
            const unsigned char *name = sqlite3_column_text(stmt, 1);
            const unsigned char *phone = sqlite3_column_text(stmt, 2);
            int age = sqlite3_column_int(stmt, 3);
           
            Person *p = [[Person alloc]initWithName:[NSString stringWithUTF8String:(const char *)name] phone:[NSString stringWithUTF8String:(const char *)phone] age:age ID:ID];
           
            [persons addObject:p];
            [p release];
           
        }
       
    }
    else
    {
        persons = [[NSMutableArray alloc]init];
    }
    sqlite3_finalize(stmt);
    return  [persons autorelease];
}
//添加元素
+(void)addName:(NSString *)name  phone:(NSString *)phone age:(int)age
{
    NSString *str = [NSString stringWithFormat:@"insert into classDB(name,phone,age) values('%@','%@',%d)",name,phone,age];
   
    sqlite3 *db = [DB openDB];
    sqlite3_stmt *stmt = nil;
   
    int result = sqlite3_prepare_v2(db, [str UTF8String],-1 ,&stmt , nil);
    if (result == SQLITE_OK)
    {
        sqlite3_step(stmt);
    }
    sqlite3_finalize(stmt);
   
      
   
}
//根据ID删除信息