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query.js
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query.js
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'use strict';
var persistUtil = require('./persist_utils');
var Connection = require('./connection');
var SqlTree = require('./sqltree');
var type = require('./type');
var inflection = require('./inflection');
var Query = function(connection, model) {
var self = this;
this._getConnection = function() { return connection; }; // hide from JSON.stringify
this.model = model;
var tableIndex = 0;
this._getNextTableAlias = function() { return 't' + (tableIndex++); };
this.count = persistUtil.bind('count', this.count, this);
this.all = persistUtil.bind('all', this.all, this);
this.first = persistUtil.bind('first', this.first, this);
this.getById = persistUtil.bind('getById', this.getById, this);
this.deleteAll = persistUtil.bind('deleteAll', this.deleteAll, this);
this.min = persistUtil.bind('min', this.min, this);
this.sum = persistUtil.bind('sum', this.sum, this);
this.max = persistUtil.bind('max', this.max, this);
var sqlTree = new SqlTree(model);
this._sqlTree = function() { return sqlTree; }; // hide from JSON.stringify
sqlTree.tableAlias = this._getNextTableAlias();
if (model.columns) {
var propertyName;
for (propertyName in model.columns) {
var colDef = sqlTree.addColumn(model, propertyName, sqlTree.tableAlias);
if (model.columns[propertyName].primaryKey) {
sqlTree.primaryKeyColumn = colDef;
}
}
}
};
// "name = ?", "bob"
// "name = ? AND age = ?", ["bob", 6]
// "name = 'bob'"
// { "name": "bob", "age", 6 }
Query.prototype.where = function() {
if (typeof (arguments[0]) === 'string') {
var expr = arguments[0];
var params = Array.prototype.slice.call(arguments, 1);
if (params.length === 1 && params[0] instanceof Array) {
params = params[0];
}
this._sqlTree().where.push({expr: expr, params: params});
} else {
var hash = arguments[0];
var key;
for (key in hash) {
this.where(key + ' = ?', [ hash[key] ]);
}
}
return this;
};
Query.prototype.whereIn = function() {
if (typeof (arguments[0]) === 'string') {
var expr = arguments[0];
var params = arguments[1];
var paramCount = params.length;
expr = expr + ' IN (';
var i;
for (i = 0; i < paramCount - 1; i++) {
expr = expr + "?,"
}
expr = expr + '?)'
this.where(expr, params);
}
return this;
};
// "people"
// ["people", "phones"]
Query.prototype.include = function() {
var join;
if (typeof (arguments[0]) === 'string') {
var associationPropertyName = arguments[0];
var association = this.model.associations[associationPropertyName]
|| this.model.associations[inflection.singularize(associationPropertyName)]
|| this.model.associations[inflection.pluralize(associationPropertyName)];
if (!association) {
throw new Error('Could not find association "' + associationPropertyName + '" off of "' + this.model.modelName + '"');
}
// join to table
if (association.through) {
// otherTable, otherTableId, thisTableId
this.leftJoin(association.through, association.foreignKey, this.model.getIdColumn().dbColumnName);
join = this._sqlTree().joins[this._sqlTree().joins.length - 1];
this.leftJoin(association.model.tableName, association.model.getIdColumn().dbColumnName, {tableAlias: join.tableAlias, dbColumnName: association.manyToManyForeignKey});
} else {
this.leftJoin(associationPropertyName);
}
// add the columns from the new table
join = this._sqlTree().joins[this._sqlTree().joins.length - 1];
var primaryKeyColumn;
var propertyName;
for (propertyName in association.model.columns) {
var col = association.model.columns[propertyName];
var colDef = this._sqlTree().addColumn(association.model, propertyName, join.tableAlias);
if (col.primaryKey) {
primaryKeyColumn = colDef;
}
}
// add the include
this._sqlTree().includes.push({ propertyName: arguments[0], association: association, primaryKeyColumn: primaryKeyColumn });
} else if (Array.isArray(arguments[0])) {
var arr = arguments[0];
var i;
for (i = 0; i < arr.length; i++) {
this.include(arr[i]);
}
} else if (arguments[0].modelName) {
this.include(arguments[0].modelName);
} else {
throw new Error("Include expects a property name or an array of property names.");
}
return this;
};
Query.prototype.join = function(otherTable, otherTableId, thisTableId) {
return this._join.apply(this, ['join'].concat(persistUtil.toArray(arguments)));
};
Query.prototype.leftJoin = function(otherTable, otherTableId, thisTableId) {
return this._join.apply(this, ['left join'].concat(persistUtil.toArray(arguments)));
};
// type, otherTable, otherTableId, thisTableId
// type, associationPropertyName
Query.prototype._join = function(type, otherTable, otherTableId, thisTableId) {
if (arguments.length === 2) {
var association = this.model.associations[arguments[1]]
|| this.model.associations[inflection.singularize(arguments[1])]
|| this.model.associations[inflection.pluralize(arguments[1])];
otherTable = association.model.tableName;
if (association.type === 'hasOne') {
otherTableId = this.model.getIdColumn().dbColumnName;
thisTableId = association.foreignKey;
} else {
otherTableId = association.foreignKey;
thisTableId = this.model.getIdColumn().dbColumnName;
}
}
if (thisTableId.tableAlias) {
thisTableId = thisTableId.tableAlias + '.' + thisTableId.dbColumnName;
} else {
thisTableId = this._sqlTree().tableAlias + '.' + thisTableId;
}
this._sqlTree().joins.push({
type: type,
otherTable: otherTable,
otherTableId: otherTableId,
thisTableId: thisTableId,
tableAlias: this._getNextTableAlias()
});
return this;
};
Query.prototype.orderBy = function(name, orderByDirection) {
var column = this._sqlTree().getColumnByPropertyName(name);
if (column === null) {
throw new Error("Invalid property name [" + name + "] for order by clause.");
}
this._sqlTree().orderBy.push({ column: column, direction: orderByDirection });
return this;
};
Query.prototype.limit = function(count, offset) {
this._sqlTree().limitCount = count;
this._sqlTree().limitOffset = offset;
return this;
};
// connection, callback, doneCallback
// callback, doneCallback
Query.prototype.each = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 2];
var doneCallback = arguments[arguments.length - 1];
if (this._sqlTree().includes.length > 0) {
throw new Error("includes are not support with 'each' method.");
}
connection.each(this._sqlTree(), callback, doneCallback);
};
Query.prototype.count = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'count';
connection.single(this._sqlTree(), 'count', callback);
};
// field (chaining)
// connection, field, callback
// field, callback
Query.prototype.min = function() {
var self = this;
if (arguments.length === 1) {
var fieldName = arguments[0];
return function(connection, callback) {
self.min(connection, fieldName, callback);
};
}
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var field = arguments[arguments.length - 2];
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'min';
this._sqlTree().columns = [ this._sqlTree().getColumnByPropertyName(field) ];
connection.single(this._sqlTree(), 'min', callback);
return null;
};
// field (chaining)
// connection, field, callback
// field, callback
Query.prototype.max = function() {
var self = this;
if (arguments.length === 1) {
var fieldName = arguments[0];
return function(connection, callback) {
self.max(connection, fieldName, callback);
};
}
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var field = arguments[arguments.length - 2];
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'max';
this._sqlTree().columns = [ this._sqlTree().getColumnByPropertyName(field) ];
connection.single(this._sqlTree(), 'max', callback);
return null;
};
// field (chaining)
// connection, field, callback
// field, callback
Query.prototype.sum = function() {
var self = this;
if (arguments.length === 1) {
var fieldName = arguments[0];
return function(connection, callback) {
self.sum(connection, fieldName, callback);
};
}
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var field = arguments[arguments.length - 2];
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'sum';
this._sqlTree().columns = [ this._sqlTree().getColumnByPropertyName(field) ];
connection.single(this._sqlTree(), 'sum', function(err, sum) {
if (err) {
return callback(err);
}
if (sum === null) {
sum = 0;
}
return callback(null, sum);
});
return null;
};
Query.prototype.all = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 1];
connection.all(this._sqlTree(), callback);
};
Query.prototype.first = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 1];
// TODO: HACK: If we have includes, limit will cause the joined rows not to be included
// so we need to not limit and just get all rows and only use the first one.
if (this._sqlTree().includes.length === 0) {
this.limit(1);
}
this.all(connection, function(err, rows) {
if (err) {
callback(err);
return;
}
if (rows.length === 0) {
callback(null, null);
} else {
callback(null, rows[0]);
}
});
};
Query.prototype.last = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 1];
this.all(connection, function(err, rows) {
if (err) {
callback(err);
return;
}
if (rows.length === 0) {
callback(null, null);
} else {
callback(null, rows[rows.length - 1]);
}
});
};
Query.prototype.getById = function() {
var args = persistUtil.toArray(arguments);
var connection = this._getConnection();
if (args[0] instanceof Connection) {
connection = args[0];
args = args.slice(1);
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var id = args[0];
var callback = args[args.length - 1];
this.where(this.model.getIdPropertyName() + " = ?", id).first(connection, function(err, row) {
if (err) {
callback(err);
return;
}
callback(null, row);
});
};
Query.prototype.deleteAll = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'delete';
this._sqlTree().columns = [];
this.all(connection, callback);
};
Query.prototype.updateAll = function() {
var connection = this._getConnection();
if (arguments[0] instanceof Connection) {
connection = arguments[0];
}
if (!connection) {
throw new Error("connection is null or undefined");
}
var updateHash = arguments[arguments.length - 2];
var callback = arguments[arguments.length - 1];
this._sqlTree().action = 'update';
this._sqlTree().updateHash = updateHash;
this.all(connection, callback);
};
module.exports = Query;