編寫 SQLite 搜索查詢的最佳方式？

Question

編寫 SQLite 查詢以從表中搜索數據的最佳實踐？

1. 最相關的結果應該在最前面
2. 結果應按照搜索詞的出現進行排序
3. 在同樣的情況下，
   1. 以搜索詞開頭的詞應該放在最前面。
   2. 中間包含搜索字符串的單詞應該在后面。
   3. 如果找到多個具有相同出現模式的單詞，則應按字母順序排序。

例如，我們有這個數據集：

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    

當一個搜索詞是O輸出應該是

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)

當搜索詞是Ol輸出應該是

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)

當一個搜索詞是Oli輸出應該是

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)

Answer 1

首先，我們必須計算搜索字符串的出現次數。 設置其列名priority 。 然后我們根據此搜索出現對所有記錄進行排序。

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
`;

輸出將是：

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)