node-query/docs/driver.js.html

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<h1 class="page-title">Source: driver.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">'use strict';
var helpers = require('./helpers');
/**
* Base Database Driver
*
* @module driver
*/
var d = {
identifierChar: '"',
tablePrefix: null,
/**
* Low level function for naive quoting of strings
* @param {String} str
* @return {String}
* @private
*/
_quote: function(str) {
return (helpers.isString(str) &amp;&amp; ! (str.startsWith(d.identifierChar) || str.endsWith(d.identifierChar)))
? d.identifierChar + str + d.identifierChar
: str;
},
/**
* Sets the table prefix on the passed string
*
* @param {String} str
* @return {String}
* @private
*/
_prefix: function(str) {
if (str.startsWith(d.prefix))
{
return str;
}
return d.prefix + str;
},
/**
* Set the limit clause
* @param {String} sql
* @param {Number} limit
* @param {Number|null} offset
* @return {String}
*/
limit: function(sql, limit, offset) {
sql += " LIMIT " + limit;
if (helpers.isNumber(offset))
{
sql += " OFFSET " + offset;
}
return sql;
},
/**
* Prefixes a table if it is not already prefixed
*
* @param {String} table
* @return {String}
*/
prefixTable: function(table) {
if (d.tablePrefix)
{
// Split identifier by period, will split into:
// database.schema.table OR
// schema.table OR
// database.table OR
// table
var idents = table.split('.', table);
var segments = idents.length;
// Add the database prefix
idents[segments - 1] = d._prefix(idents[segments - 1]);
table = idents.join('.');
}
return table;
},
/**
* Quote database table name, and set prefix
*
* @param {String} table
* @return {String}
*/
quoteTable: function(table) {
table = d.prefixTable(table);
// Quote after prefix
return d.quoteIdentifiers(table);
},
/**
* Use the driver's escape character to quote identifiers
*
* @param {String|Array}
* @return {String|Array}
*/
quoteIdentifiers: function(str) {
var hiers, raw;
// Recurse for arrays of identifiiers
if (Array.isArray(str))
{
return str.map(d.quoteIdentifiers);
}
// Handle commas
str = helpers.splitTrim(',', str);
// Split identifiers by period
hiers = str.split('.').map(d._quote);
raw = hiers.join('.');
// TODO: fix functions
return raw;
}
};
module.exports = d;</pre>
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