com.github.aly8246.collectionutil.util.CollectionUtil Maven / Gradle / Ivy
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Collection Util is a mybatis plug-in designed to solve the problem of N + 1 in mysql. When you use
Mysql to query linked tables and pages, there will be n + 1 problem. This plug-in can help you!
The newest version!
package com.github.aly8246.collectionutil.util;
import com.github.aly8246.collectionutil.core.PageInterface;
import com.github.aly8246.collectionutil.main.CollectionInterceptor;
import com.github.aly8246.collectionutil.result.PageResult;
import java.util.List;
/**
* 为用户提供获取分页数据的方法
*
* @author 南有乔木
* @version v.1.0.2
* @see PageInterface
* @see CollectionInterceptor
*/
public class CollectionUtil extends CollectionInterceptor {
private static void clear() {
pageResultThreadLocal.set(null);
}
private static PageResult basePageResult() {
PageResult pageResult = CollectionInterceptor.pageResultThreadLocal.get();
clear();
if (pageResult == null) return new PageResult();
return pageResult;
}
/**
* 从本地线程中获取分页数据
*
* @return CollectionUtil工具的原始分页结果
* @author 南有乔木
*/
public static PageResult get() {
return basePageResult();
}
/**
* 传递一个参数只是为了解决强迫症患者的问题,放进来实际上没有任何意义,只是代码可以放成一行而已
*
* @param o 可以为任意
* @return CollectionUtil工具的原始分页结果
* @author 南有乔木
*/
public static PageResult get(Object o) {
return get();
}
/**
* 为方便前端使用,将返回结果打包成Mybatis Plus的返回结果,以便无缝切换CollectionUtil和Mybatis Plus分页,各司其职
*
* @return Mybatis Plus的返回结果
* @author 南有乔木
*/
public static IPage packMPResult() {
PageResult pageResult = basePageResult();
clear();
return new IPage() {
@Override
public List getRecords() {
return pageResult.getData();
}
@Override
public IPage setRecords(List records) {
return null;
}
@Override
public long getTotal() {
return pageResult.getTotal();
}
@Override
public IPage setTotal(long total) {
return null;
}
@Override
public long getSize() {
return pageResult.getPageSize();
}
@Override
public IPage setSize(long size) {
return null;
}
@Override
public long getCurrent() {
return pageResult.getPage();
}
@Override
public IPage setCurrent(long current) {
return null;
}
};
}
/**
* 传递一个参数只是为了解决强迫症患者的问题,放进来实际上没有任何意义,只是代码可以放成一行而已
*
* @param o 可以为任意
* @return CollectionUtil工具的原始分页结果
* @author 南有乔木
*/
public static IPage packMPResult(Object o) {
return packMPResult();
}
}