query-generator.js
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var Utils = require("./utils")
var QueryGenerator = module.exports = {
/*
Returns a query for creating a table.
Attributes should have the format: {attributeName: type, attr2: type2} --> {title: 'VARCHAR(255)'}
*/
createTableQuery: function(tableName, attributes, options) {
options = options || {}
var query = "CREATE TABLE IF NOT EXISTS <%= table %> (<%= attributes%>);"
, primaryKeys = []
, attrStr = Utils._.map(attributes, function(dataType, attr) {
var dt = dataType
if (Utils._.includes(dt, 'PRIMARY KEY')) {
primaryKeys.push(attr)
return Utils.addTicks(attr) + " " + dt.replace(/PRIMARY KEY/, '')
} else {
return Utils.addTicks(attr) + " " + dt
}
}).join(", ")
, values = {table: Utils.addTicks(tableName), attributes: attrStr}
, pkString = primaryKeys.map(function(pk) {return Utils.addTicks(pk)}).join(", ")
if (pkString.length > 0) values.attributes += ", PRIMARY KEY (" + pkString + ")"
return Utils._.template(query)(values)
},
dropTableQuery: function(tableName, options) {
options = options || {}
var query = "DROP TABLE IF EXISTS <%= table %>;"
return Utils._.template(query)({table: Utils.addTicks(tableName)})
},
/*
Returns a query for selecting elements in the database <tableName>.
Options:
- attributes -> An array of attributes (e.g. ['name', 'birthday']). Default: *
- where -> A hash with conditions (e.g. {name: 'foo'})
OR an ID as integer
OR a string with conditions (e.g. 'name="foo"').
If you use a string, you have to escape it on your own.
- order -> e.g. 'id DESC'
- group
- limit -> The maximum count you want to get.
- offset -> An offset value to start from. Only useable with limit!
*/
selectQuery: function(tableName, options) {
options = options || {}
options.table = Utils.addTicks(tableName)
options.attributes = options.attributes && options.attributes.map(function(attr){return Utils.addTicks(attr)}).join(", ")
options.attributes = options.attributes || '*'
var query = "SELECT <%= attributes %> FROM <%= table %>"
if(options.where) {
options.where = QueryGenerator.getWhereConditions(options.where)
query += " WHERE <%= where %>"
}
if(options.order) query += " ORDER BY <%= order %>"
if(options.group) {
options.group = Utils.addTicks(options.group)
query += " GROUP BY <%= group %>"
}
if(options.limit) {
if(options.offset) query += " LIMIT <%= offset %>, <%= limit %>"
else query += " LIMIT <%= limit %>"
}
query += ";"
return Utils._.template(query)(options)
},
/*
Returns an insert into command. Parameters: table name + hash of attribute-value-pairs.
*/
insertQuery: function(tableName, attrValueHash) {
var query = "INSERT INTO <%= table %> (<%= attributes %>) VALUES (<%= values %>);"
var replacements = {
table: Utils.addTicks(tableName),
attributes: Utils._.keys(attrValueHash).map(function(attr){return Utils.addTicks(attr)}).join(","),
values: Utils._.values(attrValueHash).map(function(value){
return Utils.escape((value instanceof Date) ? Utils.toSqlDate(value) : value)
}).join(",")
}
return Utils._.template(query)(replacements)
},
/*
Returns an update query.
Parameters:
- tableName -> Name of the table
- values -> A hash with attribute-value-pairs
- where -> A hash with conditions (e.g. {name: 'foo'})
OR an ID as integer
OR a string with conditions (e.g. 'name="foo"').
If you use a string, you have to escape it on your own.
*/
updateQuery: function(tableName, values, where) {
var query = "UPDATE <%= table %> SET <%= values %> WHERE <%= where %>"
var replacements = {
table: Utils.addTicks(tableName),
values: Utils._.map(values, function(value, key){
return Utils.addTicks(key) + "=" + Utils.escape((value instanceof Date) ? Utils.toSqlDate(value) : value)
}).join(","),
where: QueryGenerator.getWhereConditions(where)
}
return Utils._.template(query)(replacements)
},
/*
Returns a deletion query.
Parameters:
- tableName -> Name of the table
- where -> A hash with conditions (e.g. {name: 'foo'})
OR an ID as integer
OR a string with conditions (e.g. 'name="foo"').
If you use a string, you have to escape it on your own.
Options:
- limit -> Maximaum count of lines to delete
*/
deleteQuery: function(tableName, where, options) {
options = options || {}
options.limit = options.limit || 1
var query = "DELETE FROM <%= table %> WHERE <%= where %> LIMIT <%= limit %>"
var replacements = {
table: Utils.addTicks(tableName),
where: QueryGenerator.getWhereConditions(where),
limit: Utils.escape(options.limit)
}
return Utils._.template(query)(replacements)
},
/*
Takes something and transforms it into values of a where condition.
*/
getWhereConditions: function(smth) {
var result = null
if(Utils.isHash(smth))
result = QueryGenerator.hashToWhereConditions(smth)
else if(typeof smth == 'number')
result = Utils.addTicks('id') + "=" + Utils.escape(smth)
else if(typeof smth == "string")
result = smth
return result
},
/*
Takes a hash and transforms it into a mysql where condition: {key: value, key2: value2} ==> key=value AND key2=value2
The values are transformed by the relevant datatype.
*/
hashToWhereConditions: function(hash) {
return Utils._.map(hash, function(value, key) {
var _value = Utils.escape(value)
, _key = Utils.addTicks(key)
return (_value == 'NULL') ? _key + " IS NULL" : [_key, _value].join("=")
}).join(" AND ")
}
}