org.tinygroup.tinysqldsl.extend.OracleComplexSelect Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.tinygroup.tinysqldsl Show documentation
The newest version!
/**
 * Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 * 
 * Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 * 
 * 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 org.tinygroup.tinysqldsl.extend;

import org.tinygroup.tinysqldsl.ComplexSelect;
import org.tinygroup.tinysqldsl.Select;
import org.tinygroup.tinysqldsl.operator.SetOperationInstanceCallBack;
import org.tinygroup.tinysqldsl.select.*;

import java.util.ArrayList;
import java.util.List;

/**
 * oracle复杂查询操作对象
 *
 * @author renhui
 *
 */
public class OracleComplexSelect extends ComplexSelect {

    private OracleComplexSelect() {
        super();
    }

    @SuppressWarnings("rawtypes")
    public static OracleComplexSelect union(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new UnionOperation();
            }
        }, selects);
    }

    @SuppressWarnings("rawtypes")
    public static OracleComplexSelect unionAll(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new UnionOperation(true);
            }
        }, selects);
    }

    @SuppressWarnings("rawtypes")
    public static OracleComplexSelect setOperation(
            SetOperationInstanceCallBack instance, Select... selects) {
        OracleComplexSelect complexSelect = new OracleComplexSelect();
        List plainSelects = new ArrayList();
        List operations = new ArrayList();
        for (int i = 0; i < selects.length; i++) {
            Select select = selects[i];
            plainSelects.add(select.getPlainSelect());
            if (i != 0) {
                operations.add(instance.instanceOperation());
            }
        }
        complexSelect.operationList.setOpsAndSelects(plainSelects, operations);
        return complexSelect;
    }

    @SuppressWarnings("rawtypes")
    public static OracleComplexSelect minus(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new MinusOperation();
            }
        }, selects);
    }

    @SuppressWarnings("rawtypes")
    public static OracleComplexSelect intersect(Select... selects) {
        return setOperation(new SetOperationInstanceCallBack() {
            public SetOperation instanceOperation() {
                return new IntersectOperation();
            }
        }, selects);
    }

    public OracleComplexSelect page(int start, int limit) {
        StringBuilder pagingSelect = new StringBuilder();
        if (start == 0) {
            start = 1;
        }
        pagingSelect
                .append("select * from ( select row_.*, rownum db_rownum from ( ");
        pagingSelect.append(sql());
        pagingSelect.append(" ) row_ where rownum <=" + (start + limit - 1)
                + ") where db_rownum >=" + start);
        this.stringBuilder = pagingSelect;
        return this;
    }
}