net.turnbig.jdbcx.dialect.impl.OracleDialect.java Source code

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Here is the source code for net.turnbig.jdbcx.dialect.impl.OracleDialect.java

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/*******************************************************************************
 *
 * Copyright 2014-2016 the original author or authors.
 *
 * 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 net.turnbig.jdbcx.dialect.impl;

import java.text.MessageFormat;

import org.springframework.data.domain.Pageable;

import net.turnbig.jdbcx.dialect.SelectSqlUtils;

/**
 * 
    
Oracle before 12c, the pagination SQL sample:
<pre>
SELECT * FROM (
SELECT rownum rnum, a.* 
FROM(
    SELECT fieldA,fieldB 
    FROM table 
    ORDER BY fieldA 
) a 
WHERE rownum <=5+14
)
WHERE rnum >=5
</pre>
    
    
Oracle 12c, sql Sample:
<pre>
SELECT fieldA,fieldB 
FROM table 
ORDER BY fieldA 
OFFSET 5 ROWS FETCH NEXT 14 ROWS ONLY;
</pre>
    
 * @author Woo Cupid
 * @date 2016128
 * @version $Revision$
 */
public class OracleDialect extends AbstractSQLDialect {

    /*
     * 
     * @see com.woo.jdbcx.dialect.SQLDialect#getPageableSql(java.lang.String, org.springframework.data.domain.Pageable)
     */
    @Override
    public String getPageableSql(String sql, Pageable pageable) {
        String sortedSql = SelectSqlUtils.addSort(sql, pageable.getSort());
        int startRow = pageable.getOffset();
        int endRow = pageable.getOffset() + pageable.getPageSize();
        String pagedSql = "select * from ( select tmp_page.*, rownum row_id from ({0}) tmp_page "
                + " where rownum <= {1} ) where row_id > {2}";
        return MessageFormat.format(pagedSql, sortedSql, endRow, startRow);
    }

}