OracleSubqueryFactoringTest2.java

/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package com.alibaba.druid.bvt.sql.oracle;

import org.junit.Assert;
import junit.framework.TestCase;

import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
import com.alibaba.druid.sql.test.TestUtils;

public class OracleSubqueryFactoringTest2 extends TestCase {

    public void test_interval() throws Exception {
        String sql = "WITH org_chart (eid, emp_last, mgr_id, reportLevel, salary, job_id) AS\n"
                     + "(\n"
                     + "SELECT employee_id, last_name, manager_id, 0 reportLevel, salary, job_id\n"
                     + "FROM employees\n"
                     + "WHERE manager_id is null\n"
                     + "UNION ALL\n"
                     + "SELECT e.employee_id, e.last_name, e.manager_id, r.reportLevel+1 reportLevel, e.salary, e.job_id\n"
                     + "FROM org_chart r, employees e\n" + "WHERE r.eid = e.manager_id\n" + ")\n"
                     + "SEARCH DEPTH FIRST BY emp_last SET order1\n"
                     + "CYCLE hire_date SET is_cycle TO 'Y' DEFAULT 'N'"
                     + "SELECT lpad(' ',2*reportLevel)||emp_last emp_name, eid, mgr_id, salary, job_id\n"
                     + "FROM org_chart\n" + "ORDER BY order1;\n";

        String expected = "WITH\n"
                          + "\torg_chart (eid, emp_last, mgr_id, reportLevel, salary, job_id)\n"
                          + "\tAS\n"
                          + "\t(\n"
                          + "\t\tSELECT employee_id, last_name, manager_id, 0 AS reportLevel, salary\n"
                          + "\t\t\t, job_id\n"
                          + "\t\tFROM employees\n"
                          + "\t\tWHERE manager_id IS NULL\n"
                          + "\t\tUNION ALL\n"
                          + "\t\tSELECT e.employee_id, e.last_name, e.manager_id, r.reportLevel + 1 AS reportLevel, e.salary\n"
                          + "\t\t\t, e.job_id\n" + "\t\tFROM org_chart r, employees e\n"
                          + "\t\tWHERE r.eid = e.manager_id\n" + "\t)\n"
                          + "\tSEARCH DEPTH FIRST BY emp_last SET order1\n"
                          + "\tCYCLE hire_date SET is_cycle TO 'Y' DEFAULT 'N'\n"
                          + "SELECT lpad(' ', 2 * reportLevel) || emp_last AS emp_name, eid, mgr_id, salary, job_id\n"
                          + "FROM org_chart\n" + "ORDER BY order1;\n";

        OracleStatementParser parser = new OracleStatementParser(sql);
        SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatementList().get(0);

        String text = TestUtils.outputOracle(stmt);

        Assert.assertEquals(expected, text);

        System.out.println(text);
    }

}