PGSelectTest25.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.SQLUtils;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.dialect.postgresql.parser.PGSQLStatementParser;
import com.alibaba.druid.sql.dialect.postgresql.visitor.PGSchemaStatVisitor;

public class PGSelectTest25 extends PGTest {

    public void test_0() throws Exception {
        String sql = "select COALESCE((SELECT project_deduct_mandays from mytable_01 limit 1)) from t";

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

        Assert.assertEquals("SELECT COALESCE(("
                + "\n\t\tSELECT project_deduct_mandays"
                + "\n\t\tFROM mytable_01"
                + "\n\t\tLIMIT 1"
                + "\n\t\t))"
                + "\nFROM t", SQLUtils.toPGString(stmt));
        
        Assert.assertEquals("select COALESCE(("
                + "\n\t\tselect project_deduct_mandays"
                + "\n\t\tfrom mytable_01"
                + "\n\t\tlimit 1"
                + "\n\t\t))"
                + "\nfrom t", SQLUtils.toPGString(stmt, SQLUtils.DEFAULT_LCASE_FORMAT_OPTION));

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

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

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

        Assert.assertEquals(1, visitor.getColumns().size());
        Assert.assertEquals(2, visitor.getTables().size());
    }
}