package com.xinyartech.erp.core.base;import com.xinyartech.erp.core.dto.page.PageDTO;/**   * Provider默认抽象实现** @author Lynch */
public abstract class PageSqlProvider<T> {/*** 分页sql语句，注意：最外层显示字段不能包含子查询* * @return* @author Lynch*/protected abstract String preSql(PageDTO<T> pageDto);/*** 分页列表查询* * @param pageDto* @return* @author Lynch*/public String findAll(PageDTO<T> pageDto){return preSql(pageDto);}/*** 统计分页总条数* * @return* @author Lynch*/public String countAll(PageDTO<T> pageDto){String sql = preSql(pageDto);String countSql = "select count(1) " + sql.substring(sql.indexOf("from"), sql.length());return countSql;}
}

package com.xinyartech.erp.system.mapper;import java.util.List;import org.apache.ibatis.annotations.SelectProvider;import com.xinyartech.erp.core.base.PageSqlProvider;
import com.xinyartech.erp.core.dto.page.PageDTO;
import com.xinyartech.erp.system.dto.RoleResourceDTO;
import com.xinyartech.erp.system.model.SysButton;public interface StudentMapper {@SelectProvider(type = StudentProvider.class, method = "findAll")public List<SysButton> querySysButtonList(PageDTO<RoleResourceDTO> pageDto);@SelectProvider(type = StudentProvider.class, method = "countAll")public Long count(PageDTO<RoleResourceDTO> pageDto);class StudentProvider extends PageSqlProvider<RoleResourceDTO> {@Overrideprotected String preSql(PageDTO<RoleResourceDTO> pageDto) {String sql = "select * from sys_button where 1=1";if(pageDto.getParameters().getRoleId() != null) {sql +=" and id=" + pageDto.getParameters().getRoleId();}return sql;}}
}