/*
 * Copyright 1999-2018 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.
 */
package com.alibaba.druid.bvt.sql.oracle;

import java.util.List;

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

import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
import com.alibaba.druid.sql.dialect.oracle.visitor.OracleOutputVisitor;

public class OracleSQLParserTest extends TestCase {

    public void test_1() throws Exception {
        String sql = "SELECT employees_seq.nextval FROM DUAL;";

        OracleStatementParser parser = new OracleStatementParser(sql);
        List<SQLStatement> statementList = parser.parseStatementList();

        Assert.assertEquals(1, statementList.size());

        String text = output(statementList);
        System.out.println(text);
    }

    public void test_2() throws Exception {
        String sql = "SELECT LPAD(' ',2*(LEVEL-1)) || last_name org_chart, employee_id, manager_id, job_id FROM employees WHERE job_id != 'FI_MGR' START WITH job_id = 'AD_VP' CONNECT BY PRIOR employee_id = manager_id; ";

        OracleStatementParser parser = new OracleStatementParser(sql);
        List<SQLStatement> statementList = parser.parseStatementList();

        Assert.assertEquals(1, statementList.size());

        String text = output(statementList);
        System.out.println(text);
    }

    private String output(List<SQLStatement> stmtList) {
        StringBuilder out = new StringBuilder();
        OracleOutputVisitor visitor = new OracleOutputVisitor(out);

        for (SQLStatement stmt : stmtList) {
            stmt.accept(visitor);
        }

        return out.toString();
    }
}
