PGSelectTest1.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.
 */
package com.alibaba.druid.bvt.sql.postgresql.select;

import java.util.List;

import org.junit.Assert;

import com.alibaba.druid.sql.PGTest;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectStatement;
import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
import com.alibaba.druid.sql.dialect.postgresql.visitor.PGSchemaStatVisitor;

public class PGSelectTest1 extends PGTest {

    public void test_0() throws Exception {
        String sql = "SELECT * FROM t1 CROSS JOIN t2;";

        PGSQLStatementParser parser = new PGSQLStatementParser(sql);
        List<SQLStatement> statementList = parser.parseStatementList();
        SQLStatement statemen = statementList.get(0);
//        print(statementList);

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

        PGSchemaStatVisitor visitor = new PGSchemaStatVisitor();
        statemen.accept(visitor);

//        System.out.println("Tables : " + visitor.getTables());
//        System.out.println("fields : " + visitor.getColumns());
//        System.out.println("coditions : " + visitor.getConditions());

        Assert.assertEquals(0, visitor.getColumns().size());
        Assert.assertEquals(2, visitor.getTables().size());
    }
    
    public void test_1() throws Exception {
    	String sql = "(select * from a) union select * from b";
    	 PGSQLStatementParser parser = new PGSQLStatementParser(sql);
         List<SQLStatement> statementList = parser.parseStatementList();
         SQLStatement statemen = statementList.get(0);
//         print(statementList);

		Assert.assertEquals(1, statementList.size());
		assertTrue(statemen instanceof PGSelectStatement);
		PGSelectStatement select = (PGSelectStatement) statemen;
		assertTrue(select.getSelect().getQuery() instanceof SQLUnionQuery);
		SQLUnionQuery unionQuery = (SQLUnionQuery) select.getSelect()
				.getQuery();
		assertTrue(unionQuery.getLeft() instanceof SQLSelectQueryBlock);
		assertTrue(unionQuery.getRight() instanceof SQLSelectQueryBlock);
		SQLSelectQueryBlock leftQueryBlock = (SQLSelectQueryBlock) unionQuery
				.getLeft();
		assertTrue(leftQueryBlock.isParenthesized());
    }

}

// select categoryId , offerIds from cnres.function_select_get_spt_p4p_offer_list (' 1031918 , 1031919 , 1037004 ') as
// a(categoryId numeric,offerIds character varying(4000))
// select memberId , offerIds from cnres.function_select_get_seller_hot_offer_list('\'gzyyd168\'') as a(memberId
// character varying(20),offerIds character varying(4000))