158 lines
3.5 KiB
JavaScript
Executable File
158 lines
3.5 KiB
JavaScript
Executable File
'use strict';
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var _helpers = require('./helpers');
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var _helpers2 = _interopRequireDefault(_helpers);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Base Database Driver
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*
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* @module driver
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*/
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var d = {
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identifierStartChar: '"',
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identifierEndChar: '"',
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tablePrefix: null,
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hasTruncate: true,
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/**
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* Low level function for naive quoting of strings
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* @param {String} str
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* @return {String}
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* @private
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*/
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_quote: function _quote(str) {
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return _helpers2.default.isString(str) && !(str.startsWith(d.identifierStartChar) || str.endsWith(d.identifierEndChar)) ? d.identifierStartChar + str + d.identifierEndChar : str;
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},
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/**
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* Set the limit clause
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* @param {String} sql
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* @param {Number} limit
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* @param {Number|null} offset
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* @return {String}
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*/
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limit: function limit(sql, _limit, offset) {
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sql += " LIMIT " + _limit;
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if (_helpers2.default.isNumber(offset)) {
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sql += " OFFSET " + offset;
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}
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return sql;
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},
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/**
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* Quote database table name, and set prefix
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*
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* @param {String} table
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* @return {String}
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*/
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quoteTable: function quoteTable(table) {
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// Quote after prefix
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return d.quoteIdentifiers(table);
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},
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/**
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* Use the driver's escape character to quote identifiers
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*
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* @param {String|Array}
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* @return {String|Array}
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*/
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quoteIdentifiers: function quoteIdentifiers(str) {
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var hiers, raw;
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var pattern = new RegExp(d.identifierStartChar + '(' + '([a-zA-Z0-9_]+)' + '(\((.*?)\))' + ')' + d.identifierEndChar, 'ig');
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// Recurse for arrays of identifiiers
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if (Array.isArray(str)) {
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return str.map(d.quoteIdentifiers);
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}
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// Handle commas
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if (str.includes(',')) {
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var parts = str.split(',').map(_helpers2.default.stringTrim);
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str = parts.map(d.quoteIdentifiers).join(',');
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}
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// Split identifiers by period
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hiers = str.split('.').map(d._quote);
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raw = hiers.join('.');
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// Fix functions
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if (raw.includes('(') && raw.includes(')')) {
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var funcs = pattern.exec(raw);
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// Unquote the function
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raw = raw.replace(funcs[0], funcs[1]);
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// Quote the identifiers inside of the parens
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var inParens = funcs[3].substring(1, funcs[3].length - 1);
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raw = raw.replace(inParens, d.quoteIdentifiers(inParens));
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}
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return raw;
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},
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/**
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* SQL to truncate the passed table
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*
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* @param {String} table
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* @return {String} - sql
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*/
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truncate: function truncate(table) {
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var sql = d.hasTruncate ? 'TRUNCATE ' : 'DELETE FROM ';
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sql += d.quoteTable(table);
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return sql;
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},
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/**
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* SQL to insert a group of rows
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*
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* @param {String} table - The table to insert to
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* @param {Array} [data] - The array of object containing data to insert
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* @return {String}
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*/
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insertBatch: function insertBatch(table, data) {
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var vals = [],
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fields = Object.keys(data[0]),
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sql = "",
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params = [],
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paramString = "",
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paramList = [];
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// Get the data values to insert, so they can
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// be parameterized
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data.forEach(function (obj) {
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Object.keys(obj).forEach(function (key) {
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vals.push(obj[key]);
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});
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});
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// Get the field names from the keys of the first
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// object inserted
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table = d.quoteTable(table);
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sql += "INSERT INTO " + table + " (" + d.quoteIdentifiers(fields).join(",") + ") VALUES ";
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// Create placeholder groups
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params = Array(fields.length).fill('?');
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paramString = "(" + params.join(',') + ")";
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paramList = Array(data.length).fill(paramString);
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sql += paramList.join(',');
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return {
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sql: sql,
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values: vals
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};
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}
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};
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module.exports = d;
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//# sourceMappingURL=DriverBase.js.map
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