嘿所有我在下面,下面的代碼我一直在努力:拆分查詢(SELECT/FROM/WHERE/AND/OR)
var sql = "SELECT pillers, Balloons, Tacks FROM the_database_file WHERE Balloons != 'small' AND Balloons != 'large' AND Blah = 'bobby';";
$(document).ready(function() {
var findFROM = sql.indexOf(" FROM");
var findWHERE = sql.indexOf(" WHERE");
var findAND = sql.indexOf(" AND");
var findOR = sql.indexOf(" OR");
var findSemicolon = sql.indexOf(";");
var findCountAND = sql.match(/\AND\b/g);
var findCountOR = sql.match(/\OR\b/g);
var txtSELECT = sql.substring(0, findFROM);
var txtFROM = sql.substring(findFROM, findWHERE);
var txtWHERE = "";
var txtAND = "";
var txtOR = "";
if (findAND != -1) {
var _tmpPos = 0;
var _tmpAND = "";
findCountAND = (findCountAND? findCountAND.length : 0);
findCountOR = (findCountOR? findCountOR.length : 0);
for (var i = 1; i < findCountAND; i++) {
console.log(i);
_tmpPos = nth_occurrence(sql, ' AND', i);
_tmpPos = findAND;
findAND = sql.indexOf(" AND");
_tmpAND = sql.substring(_tmpPos, findAND);
}
txtWHERE = sql.substring(findWHERE, findAND);
}
$('#SELECT').text(txtSELECT);
$('#FROM').text(txtFROM);
$('#WHERE').text(txtWHERE);
$('#test').text(findAND);
});
function nth_occurrence(string, char, nth) {
var first_index = string.indexOf(char);
var length_up_to_first_index = first_index + 1;
if (nth == 1) {
return first_index;
} else {
var string_after_first_occurrence = string.slice(length_up_to_first_index);
var next_occurrence = nth_occurrence(string_after_first_occurrence, char, nth - 1);
if (next_occurrence === -1) {
return -1;
} else {
return length_up_to_first_index + next_occurrence;
}
}
}
我試圖像這樣格式化:
SELECT pillers, Balloons, Tacks
FROM the_database_file
WHERE Balloons != 'small'
AND Balloons != 'large'
AND Blah = 'bobby';
不過,我陷在試圖找到查詢字符串多於一個和或OR的區域。上面的例子只有2 和的開始,但我似乎無法得到正確的代碼。
nth_occurrence功能被發現HERE。
如果有人能幫助我,那會很棒。可能REGEX將會是所有需要的?誰知道?
A JSFIDDLE也已設置好。
UPDATE
得益於一種論壇成員HERE我能更新我的JSFIDDLE我試圖在試圖重建他做了什麼:
[ { word: 'SELECT', index: 0, text: 'pillers, Balloons, Tacks' },
{ word: 'FROM', index: 32, text: 'the_database_file' },
{ word: 'WHERE', index: 55, text: 'Balloons != \'small\'' },
{ word: 'AND', index: 81, text: 'Balloons != \'large\'' },
{ word: 'AND', index: 105, text: 'Blah = \'bobby\'' },
{ word: ';', index: 123 } ]
但是,我嘗試沒來同樣的。任何幫助?
如果什麼關鍵詞將是小寫 - 沒有檢測?或者,例如,將會有類似於「來自t1 ...的從...開始的SELECT t1.countryFrom ...」的查詢。您的parcer在第一個「from」提到時會失敗。這不是一個好方法,正如我在下面的答案中所述。 – Farside