2019独角兽企业重金招聘Python工程师标准>>> 
由于项目中用了mybatis分页插件
com.github.pagehelper.Page
有时候复杂的查询分页想用jdbcTemplate。又想用分页。
分页对象
public class PageBean implements Serializable {
private static final long serialVersionUID = 8656597559014685635L;
private long total; //总记录数
private List list; //结果集
private int pageNum; // 第几页
private int pageSize; // 每页记录数
private int pages; // 总页数
private int size; // 当前页的数量 <= pageSize，该属性来自ArrayList的size属性
public PageBean() {}
/**
* 包装Page对象，因为直接返回Page对象，在JSON处理以及其他情况下会被当成List来处理，
* 而出现一些问题。
* @param list page结果
* @param navigatePages 页码数量
*/
public PageBean(List list) {
if (list instanceof Page) {
Page page = (Page) list;
this.pageNum = page.getPageNum();
this.pageSize = page.getPageSize();
this.total = page.getTotal();
this.pages = page.getPages();
this.list = page;
this.size = page.size();
}
}
public long getTotal() {
return total;
}
public void setTotal(long total) {
this.total = total;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public int getPageNum() {
return pageNum;
}
public void setPageNum(int pageNum) {
this.pageNum = pageNum;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getPages() {
return pages;
}
public void setPages(int pages) {
this.pages = pages;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
}
/**
jdbcTemplate 封装类
**/
@Slf4j
public class JdbcTemplateSupport extends JdbcTemplate {
public JdbcTemplateSupport() {
}
public JdbcTemplateSupport(DataSource dataSource) {
super(dataSource);
}
public JdbcTemplateSupport(DataSource dataSource, boolean lazyInit) {
super(dataSource,lazyInit);
}
public PageBean queryForPage(String sql, Page pagination,RowMapper rowMapper) throws DataAccessException {
return queryForPage(sql,pagination, new PreparedStatementSetter() {
public void setValues(PreparedStatement preparedStatement) throws SQLException {
return;
}
},rowMapper);
}
public PageBean queryForPage(String sql, Page pagination,PreparedStatementSetter var2, RowMapper var3) throws DataAccessException{
PageBean result= new PageBean();
//获取记录条数
String countSql="select count(1) as count from ("+sql+") temp";
log.info("countSql {}",countSql);
List countList= super.query(countSql, var2, new RowMapper() {
public Integer mapRow(ResultSet resultSet, int i) throws SQLException {
return new Integer(resultSet.getInt("count"));
}
});
result.setTotal(countList.get(0));
result.setSize(countList.get(0));
result.setPageNum(pagination.getPageNum());
result.setPageSize(pagination.getPageSize());
int pageCount=result.getSize()%result.getPageSize();
result.setPages(pageCount==0?(result.getSize()/result.getPageSize()):(result.getSize()/result.getPageSize()+1));
sql+=parseLimit(result);
log.info("queryLimitSql {}",sql);
List data= super.query(sql,var2,var3);
result.setList(data);
return result;
}
private String parseLimit(PageBean pagination){
StringBuffer stringBuffer=new StringBuffer();
stringBuffer.append(" ");
stringBuffer.append("limit");
stringBuffer.append(" ");
if(pagination.getPageNum() == 0) {
stringBuffer.append("0");
}else {
stringBuffer.append((pagination.getPageNum()-1)*pagination.getPageSize());
}
stringBuffer.append(",");
stringBuffer.append(pagination.getPageSize());
return stringBuffer.toString();
}
使用
Page pagination = PageHelper.startPage(PaginationContext.getPageNum(), PaginationContext.getPageSize());
PageBean queryForPage = jdbcTemplateSupport.queryForPage(builder.toString() , pagination, new BeanPropertyRowMapper<>(Bean.class));