Question

我的数据库设置有4个表。所有表都有相同的列数，它们的列名略有不同。如果它是ZCARBOHYDRATES则在一个表中，然后在另一个表中，它是ZCARBOHYDRATES_PER_SERVING。

在视图控制器上，我有一个搜索栏。在搜索栏中键入内容时，搜索查询将起作用，从数据库中检索数据并填充表格视图。

到目前为止，搜索查询的工作方式如下：

如果用户输入莫扎里拉奶酪（全脂牛奶），那么

选择包含搜索文本'Mozzarella Cheese（Whole Milk）'
选择包含Mozzarella的记录+选择包含Cheese +的记录+选择包含Whole +的记录选择包含Milk的记录。

现在1.的结果是“联合”所有包含Mozzarella'union'的记录包含'Cheese''union'的所有记录包含'Whole''union'的所有记录包含''奶”。

代码：

-(NSArray *)getFilteredRecordsUsingSearchText:(NSString *)searchText
{

    NSMutableArray *searchArr = [[NSMutableArray alloc]init];

    //for first table
    NSMutableString *queryForRecipe = [NSMutableString stringWithFormat:@" select ZCODE as code , ZRECIPE_TITLE as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories ,  ZSERVINGS as servingSize , ZSERVING_SIZE_DESCRIPTION_1 as servingUnit , 'ZRECIPES' as TableName from ZRECIPES  where title like '%%%@%%' ",searchText];//retrieving data according to point 1
    NSArray *seprateSearchText = [searchText componentsSeparatedByString:@" "];

    for (NSString *str in seprateSearchText) {

         if (str.length>2) {
            [queryForRecipe appendFormat:@" union select ZCODE as code , ZRECIPE_TITLE as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories ,  ZSERVINGS as servingSize , ZSERVING_SIZE_DESCRIPTION_1 as servingUnit , 'ZRECIPES' as TableName from ZRECIPES  where title like '%%%@%%' ",str];
        }
    }//retrieving data according to point 2


//for second table
NSMutableString *queryForAddedRecipe=[NSMutableString stringWithFormat:@" select ZCODE as code , ZRECIPE_TITLE as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories ,  ZSERVINGS as servingSize , ZSERVING_SIZE_DESCRIPTION_1 as servingUnit , 'ZADDED_RECIPE' as TableName from ZADDED_RECIPE  where title like '%%%@%%' ",searchText];//retrieving data according to point 1

for (NSString *str in seprateSearchText) {
     if (str.length>2) {
    [queryForAddedRecipe appendFormat:@" union select ZCODE as code , ZRECIPE_TITLE as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories ,  ZSERVINGS as servingSize , ZSERVING_SIZE_DESCRIPTION_1 as servingUnit , 'ZRECIPES' as TableName from ZRECIPES  where title like '%%%@%%' ",str];
     }
}//retrieving data according to point 2


//for third table
NSMutableString *queryForUSDAFood=[NSMutableString stringWithFormat:@"  select ZCODE as code , ZFOOD_ITEM as title , ZFAT as fat , ZFIBER as fiber , ZPROTEIN as protien , ZSUGARS as sugar , ZCARBOHYDRATE as carbs , ZCALORIES as calories ,   ZSERVING_DESC_1 as servingSize , ZSERVING_SIZE_DESC_1 as servingUnit  ,'ZUSDA_FOODS' as TableName from ZUSDA_FOODS  where  title like '%%%@%%' ",searchText];//retrieving data according to point 1



for (NSString *str in seprateSearchText) {

    if (str.length>2) {
        [queryForUSDAFood appendFormat:@" union select ZCODE as code , ZFOOD_ITEM as title , ZFAT as fat , ZFIBER as fiber , ZPROTEIN as protien , ZSUGARS as sugar , ZCARBOHYDRATE as carbs , ZCALORIES as calories ,   ZSERVING_DESC_1 as servingSize , ZSERVING_SIZE_DESC_1 as servingUnit  ,'ZUSDA_FOODS' as TableName from ZUSDA_FOODS  where  title like '%%%@%%'  ",str];
    }
}//retrieving data according to point 2


//for fourth table
NSMutableString *queryForAddedFood=[NSMutableString stringWithFormat:@" select ZCODE as code , ZFOOD_ITEM as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories , ZSERVING_SIZE_1 as servingSize , ZSERVING_UNIT_1 as servingUnit , 'ZADDED_FOOD_ITEMS' as TableName from ZADDED_FOOD_ITEMS  where  title like '%%%@%%' ",searchText];//retrieving data according to point 1



for (NSString *str in seprateSearchText) {

     if (str.length>2) {

    [queryForAddedFood appendFormat:@" union select ZCODE as code , ZFOOD_ITEM as title , ZFAT_PER_SERVING as fat , ZFIBER_PER_SERVING as fiber , ZPROTEIN_PER_SERVING as protien , ZSUGARS_PER_SERVING as sugar , ZCARBOHYDRATES_PER_SERVING as carbs , ZCALORIES_PER_SERVING as calories , ZSERVING_SIZE_1 as servingSize , ZSERVING_UNIT_1 as servingUnit , 'ZADDED_FOOD_ITEMS' as TableName from ZADDED_FOOD_ITEMS  where  title like '%%%@%%' ",str];

     }
}//retrieving data according to point 2


NSString *combineQuery=[NSString stringWithFormat:@" %@ union %@ union %@ union %@ ORDER BY title ASC ",queryForRecipe,queryForAddedRecipe,queryForUSDAFood,queryForAddedFood];

........ ........
// rest就是准备sql语句......

现在需要做什么？

现在必须更改搜索查询以满足以下条件：

1.如果搜索词包含多个单词，例如“鸡胸肉”搜索结果应该包含项目标题中的两个单词，包括复数形式如“鸡胸肉”。如果搜索是“苹果”等，也可以是“苹果”。

2.Punctuation marks（'， - ，/，...）和文章（the，and，an）应该被忽略（例如，“鸡（乳房或翅膀......）将首先返回所有3个单词。接下来，任何2个字。最后任意一个字。

我正在寻求帮助以形成符合上述标准的查询（尤其是难以满足第2点。）。

使sql查询从sqlite数据库中检索数据

0 个答案: