core.plugin.mybatis.dialect.OracleDialect.java Source code

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/************************************************************************
 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
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 ************************************************************************/
package core.plugin.mybatis.dialect;

import org.apache.ibatis.session.RowBounds;

/**
 * <p>
 * Oracle ?
 * </p>
 *
 * @author CSJ (raulcsj@126.com)
 * @version 1.0
 */
public class OracleDialect implements Dialect {

    /**
     * ORACLE SQL:
     * 
     * <pre>
     * SELECT * FROM (
     *     SELECT row_.*, ROWNUM rownum_ FROM (
     *         orginSQL
     *     ) row_ WHERE ROWNUM <= MAX
     * )
     * WHERE rownum_ > START
     * </pre>
     */
    @Override
    public String getSqlWithPagination(String sql, RowBounds rowBounds) {
        StringBuilder sqlBuilder = new StringBuilder();
        sqlBuilder.append("SELECT * FROM (SELECT row_.*, ROWNUM rownum_ FROM ( ").append(sql).append(
                " ) row_ WHERE ROWNUM <= " + rowBounds.getLimit() + ") WHERE rownum_ > " + rowBounds.getOffset());
        return sqlBuilder.toString();
    }
}