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194 lines
6.1 KiB
JavaScript
194 lines
6.1 KiB
JavaScript
![]() |
// Oracle Query Builder & Compiler
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// ------
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'use strict';
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module.exports = function(client) {
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var _ = require('lodash');
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var inherits = require('inherits');
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var QueryBuilder = require('../../query/builder');
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var QueryCompiler = require('../../query/compiler');
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var ReturningHelper = require('./utils').ReturningHelper;
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// Query Builder
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// -------
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// Extend the QueryBuilder base class to include the "Formatter"
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// which has been defined on the client, as well as the
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function QueryBuilder_Oracle() {
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this.client = client;
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QueryBuilder.apply(this, arguments);
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}
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inherits(QueryBuilder_Oracle, QueryBuilder);
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// Query Compiler
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// -------
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// Set the "Formatter" to use for the queries,
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// ensuring that all parameterized values (even across sub-queries)
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// are properly built into the same query.
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function QueryCompiler_Oracle() {
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this.formatter = new client.Formatter();
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QueryCompiler.apply(this, arguments);
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}
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inherits(QueryCompiler_Oracle, QueryCompiler);
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QueryCompiler_Oracle.prototype._returning = function(value) {
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if (!value || value === '*') {
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return '';
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}
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var outParams;
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var self = this;
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if (_.isArray(value)) {
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outParams = _.map(value, function (v) {
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return self.formatter.parameter(new ReturningHelper(v));
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}).join (', ');
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} else {
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outParams = self.formatter.parameter(new ReturningHelper(value));
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}
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return ' returning ' + this.formatter.columnize(value) + ' into ' + outParams;
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};
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// Compiles an "insert" query, allowing for multiple
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// inserts using a single query statement.
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QueryCompiler_Oracle.prototype.insert = function() {
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var returning = this.single.returning;
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var sql;
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if (_.isEmpty(this.single.insert)) {
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sql = 'insert into ' + this.tableName + ' (' + this.formatter.wrap(this.single.returning) + ') values (default)';
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sql += this._returning(returning);
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} else {
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var insertData = this._prepInsert(this.single.insert);
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if (_.isString(insertData)) {
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sql = 'insert into ' + this.tableName + ' ' + insertData;
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sql += this._returning(returning);
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} else {
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var self = this;
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var multiInsert = insertData.values.length > 1;
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sql = (multiInsert ? 'insert all ' : 'insert ') +
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_.map(
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_.map(insertData.values, self.formatter.parameterize, self.formatter),
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function (value) {
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return 'into ' + self.tableName +
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' (' + self.formatter.columnize(insertData.columns) + ') values (' + value + ')' +
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(multiInsert ? '' : self._returning(returning));
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}
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).join(' ') + (multiInsert ? ' select 1 from dual' : '');
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}
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}
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return sql;
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};
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// Update method, including joins, wheres, order & limits.
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QueryCompiler_Oracle.prototype.update = function() {
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var join = this.join();
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var updates = this._prepUpdate(this.single.update);
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var where = this.where();
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var order = this.order();
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var limit = this.limit();
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return 'update ' + this.tableName +
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(join ? ' ' + join : '') +
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' set ' + updates.join(', ') +
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(where ? ' ' + where : '') +
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(order ? ' ' + order : '') +
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(limit ? ' ' + limit : '');
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};
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// Compiles a `truncate` query.
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QueryCompiler_Oracle.prototype.truncate = function() {
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return 'truncate table ' + this.tableName;
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};
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QueryCompiler_Oracle.prototype.forUpdate = function() {
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return 'for update';
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};
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QueryCompiler_Oracle.prototype.forShare = function() {
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return 'lock in share mode';
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};
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// Compiles a `columnInfo` query.
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QueryCompiler_Oracle.prototype.columnInfo = function() {
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var column = this.single.columnInfo;
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return {
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sql: 'select COLUMN_NAME, DATA_TYPE, CHAR_COL_DECL_LENGTH, NULLABLE from USER_TAB_COLS where TABLE_NAME = :1',
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bindings: [this.single.table],
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output: function(resp) {
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var out = _.reduce(resp, function(columns, val) {
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columns[val.COLUMN_NAME] = {
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type: val.DATA_TYPE,
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maxLength: val.CHAR_COL_DECL_LENGTH,
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nullable: (val.NULLABLE === 'Y')
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};
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return columns;
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}, {});
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return column && out[column] || out;
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}
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};
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};
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QueryCompiler_Oracle.prototype.limit = function() {
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// throw new Error("This function should never be called for oracle");
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};
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QueryCompiler_Oracle.prototype.offset = function() {
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// throw new Error("This function should never be called for oracle");
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};
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function surroundQueryWithLimitAndOffset(self, query, limit, offset) {
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if (!limit && !offset) {
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return query;
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}
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query = query || "";
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if (limit && !offset) {
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return "select * from (" + query + ") where rownum <= " + self.formatter.parameter(limit);
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}
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var endRow = +(offset) + (+limit || 10000000000000);
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return "select * from " +
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"(select row_.*, ROWNUM rownum_ from (" + query + ") row_ " +
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"where rownum <= " + self.formatter.parameter(endRow) + ") " +
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"where rownum_ > " + self.formatter.parameter(offset);
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}
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var components = [
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'columns', 'join', 'where', 'union', 'group',
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'having', 'order', /*'limit', 'offset', */'lock'
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];
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// Compiles the `select` statement, or nested sub-selects
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// by calling each of the component compilers, trimming out
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// the empties, and returning a generated query string.
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QueryCompiler_Oracle.prototype.select = function() {
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var self = this;
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var statements = _.map(components, function (component) {
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return self[component](self);
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});
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var query = _.compact(statements).join(' ');
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return surroundQueryWithLimitAndOffset(self, query, this.single.limit, this.single.offset);
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};
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QueryCompiler_Oracle.prototype.aggregate = function(stmt) {
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var val = stmt.value;
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var splitOn = val.toLowerCase().indexOf(' as ');
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// Allows us to speciy an alias for the aggregate types.
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if (splitOn !== -1) {
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var col = val.slice(0, splitOn);
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var alias = val.slice(splitOn + 4);
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return stmt.method + '(' + this.formatter.wrap(col) + ') ' + this.formatter.wrap(alias);
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}
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return stmt.method + '(' + this.formatter.wrap(val) + ')';
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};
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// Set the QueryBuilder & QueryCompiler on the client object,
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// incase anyone wants to modify things to suit their own purposes.
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client.QueryBuilder = QueryBuilder_Oracle;
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client.QueryCompiler = QueryCompiler_Oracle;
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};
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