编写 SQLite 搜索查询的最佳方式？答案

【问题标题】：Best way to write SQLite Search Query?编写 SQLite 搜索查询的最佳方式？
【发布时间】：2023-04-01 23:52:01
【问题描述】：

编写 SQLite 查询以从表中搜索数据的最佳实践？

最相关的结果应该在顶部
结果应该按照搜索词的出现排序
在同样出现的情况下，
1. 以搜索词开头的词应该在最前面。
2. 中间包含搜索字符串的单词应该稍后出现。
3. 如果发现多个单词具有相同的出现模式，则应按字母顺序排序。

例如，我们有这个数据集：

Borges Extra Virgin Olive Oil
Canola Oil Bottle
Extra Virgin Olive Oil - Olive Jar
Extra Virgin Olive Oil - Olive Tin
Olive Pomace Oil
Supreme Cooking Oil

当搜索词是O时，输出应该是

Extra Virgin Olive Oil - Olive Jar (3 Occuracne of `O` in start)
Extra Virgin Olive Oil - Olive Tin (3 Occuracne of `O` in start)
Borges Extra Virgin Olive Oil (2 Occuracne of `O` in the start and 1 in mid)
Olive Pomace Oil (2 Occuracne of `O` in the start)
Canola Oil Bottle (1 Occuracne of `O` in the start and 2 in the mid)
Supreme Cooking Oil (1 Occuracne of `O` in the start and 2 in the mid)

当搜索词是Ol时输出应该是

Extra Virgin Olive Oil - Olive Jar (2 Occuracne of `Ol` in start)
Extra Virgin Olive Oil - Olive Tin (2 Occuracne of `Ol` in start)
Borges Extra Virgin Olive Oil (1 Occuracne of `Ol` in start)
Olive Pomace Oil (1 Occuracne of `Ol` in start)
Canola Oil Bottle (1 Occuracne of `Ol` in the mind)

当搜索词是Oli时输出应该是

Extra Virgin Olive Oil - Olive Jar (2 Occuracne of `Oli` in start)
Extra Virgin Olive Oil - Olive Tin (2 Occuracne of `Oli` in start)
Borges Extra Virgin Olive Oil (1 Occuracne of `Oli` in start)
Olive Pomace Oil (1 Occuracne of `Oli` in start)

【问题讨论】：

标签： jquery sql sqlite search

【解决方案1】：

首先，我们要计算搜索字符串的出现次数。设置其列名priority。然后我们根据该搜索出现对所有记录进行排序。

let searchTerm = 'Oil';
let searchQuery = `
   SELECT (length(trim(name)) - length(replace(trim(name), '${searchTerm}', ''))) as 'priority', *
   FROM product
   WHERE
       NAME LIKE '${searchTerm}' OR
       NAME LIKE '${searchTerm}%' OR
       NAME LIKE '% ${searchTerm}%' OR
       NAME LIKE '%${searchTerm}%'
   ORDER BY 1 DESC, NAME ASC
   LIMIT 0, 20
`;

输出将是：

Extra Virgin Olive Oil - Olive Jar (2 Occuracne of `Oli` in start)
Extra Virgin Olive Oil - Olive Tin (2 Occuracne of `Oli` in start)
Borges Extra Virgin Olive Oil (1 Occuracne of `Oli` in start)
Olive Pomace Oil (1 Occuracne of `Oli` in start)

【讨论】：