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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | 10x 10x 10x 10x 10x 10x 10x 9x 9x 9x 9x 1x 1x 10x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 10x 2x 2x 2x 2x 10x 10x 1x 1x 1x 1x 10x 17x 17x 17x 17x 17x 17x 10x 10x 22x 22x 13x 13x 10x 17x 17x 17x 17x 17x 17x 17x 17x 51x 51x 10x 8x 8x 6x 8x 2x 2x 2x 4x 4x 10x 8x 1x 1x 1x 1x 8x 3x 3x 3x 3x 3x 3x 10x 8x 8x 8x 8x 22x 22x 22x 22x 17x 17x 17x 8x 8x 8x 8x 8x 8x 8x 10x 1x 1x 1x 1x | export class FluentSQLBuilder {
#database = [];
#limit = 0;
#select = [];
#where = [];
#orderBy = '';
#groupCount = '';
constructor ({ database }) {
this.#database = database;
};
static for(database) {
return new FluentSQLBuilder({ database });
};
limit (max) {
this.#limit = max;
return this;
};
where (query) {
const [[ prop, selectedValue ]] = Object.entries(query);
const whereFilter = selectedValue instanceof RegExp ?
selectedValue : new RegExp(selectedValue);
this.#where.push({ prop, filter: whereFilter });
return this;
};
select (props) {
this.#select = props;
return this;
};
orderBy (field) {
this.#orderBy = field;
return this;
};
groupCount (field) {
this.#groupCount = field;
return this;
};
#performLimit (results) {
return this.#limit && results.length === this.#limit;
};
#performWhere (item) {
for (const { filter, prop } of this.#where) {
if (!filter.test(item[prop])) return false;
};
return true;
};
#performSelect (item) {
const currentItem = {};
const entries = Object.entries(item);
for (const [key, value] of entries) {
if (this.#select.length && !this.#select.includes(key)) continue;
currentItem[key] = value;
};
return currentItem;
};
#performOrderBy (results) {
if (!this.#orderBy) return results;
return results.sort((prev, next) => {
return prev[this.#orderBy].localeCompare(next[this.#orderBy]);
});
};
#performGroupCount (results) {
if (!this.#groupCount) return results;
const accumulator = {}
for (const result of results) {
const targetField = result[this.#groupCount];
accumulator[targetField] = accumulator[targetField] ?? 0;
accumulator[targetField] += 1;
};
return [accumulator];
};
build () {
const results = [];
for (const item of this.#database) {
if (!this.#performWhere(item)) continue;
const currentItem = this.#performSelect(item);
results.push(currentItem);
if(this.#performLimit(results)) break;
};
const groupped = this.#performGroupCount(results);
const orderedResult = this.#performOrderBy(groupped);
return orderedResult;
};
}; |