package cn.iocoder.yudao.framework.mybatis.core.util;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.lang.func.Func1;
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import cn.hutool.core.lang.func.LambdaUtil;
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import cn.hutool.core.util.StrUtil;
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import cn.iocoder.yudao.framework.common.pojo.PageParam;
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import cn.iocoder.yudao.framework.common.pojo.SortingField;
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import cn.iocoder.yudao.framework.mybatis.core.enums.DbTypeEnum;
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import com.baomidou.mybatisplus.annotation.DbType;
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import com.baomidou.mybatisplus.core.conditions.Wrapper;
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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
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import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
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import com.baomidou.mybatisplus.core.metadata.OrderItem;
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import com.baomidou.mybatisplus.core.toolkit.StringPool;
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import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
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import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
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import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
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import net.sf.jsqlparser.expression.Alias;
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import net.sf.jsqlparser.schema.Column;
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import net.sf.jsqlparser.schema.Table;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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/**
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* MyBatis 工具类
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*/
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public class MyBatisUtils {
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private static final String MYSQL_ESCAPE_CHARACTER = "`";
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public static <T> Page<T> buildPage(PageParam pageParam) {
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return buildPage(pageParam, null);
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}
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public static <T> Page<T> buildPage(PageParam pageParam, Collection<SortingField> sortingFields) {
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// 页码 + 数量
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Page<T> page = new Page<>(pageParam.getPageNo(), pageParam.getPageSize());
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page.setOptimizeJoinOfCountSql(false); // 关联 issue：https://gitee.com/zhijiantianya/yudao-cloud/issues/ID2QLL
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// 排序字段
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if (CollUtil.isNotEmpty(sortingFields)) {
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for (SortingField sortingField : sortingFields) {
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page.addOrder(new OrderItem().setAsc(SortingField.ORDER_ASC.equals(sortingField.getOrder()))
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.setColumn(StrUtil.toUnderlineCase(sortingField.getField())));
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}
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}
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return page;
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}
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@SuppressWarnings("PatternVariableCanBeUsed")
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public static <T> void addOrder(Wrapper<T> wrapper, Collection<SortingField> sortingFields) {
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if (CollUtil.isEmpty(sortingFields)) {
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return;
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}
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if (wrapper instanceof QueryWrapper<T>) {
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QueryWrapper<T> query = (QueryWrapper<T>) wrapper;
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for (SortingField sortingField : sortingFields) {
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query.orderBy(true,
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SortingField.ORDER_ASC.equals(sortingField.getOrder()),
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StrUtil.toUnderlineCase(sortingField.getField()));
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}
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} else if (wrapper instanceof LambdaQueryWrapper<T>) {
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// LambdaQueryWrapper 不直接支持字符串字段排序，使用 last 方法拼接 ORDER BY
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LambdaQueryWrapper<T> lambdaQuery = (LambdaQueryWrapper<T>) wrapper;
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StringBuilder orderBy = new StringBuilder();
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for (SortingField sortingField : sortingFields) {
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if (StrUtil.isNotEmpty(orderBy)) {
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orderBy.append(", ");
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}
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orderBy.append(StrUtil.toUnderlineCase(sortingField.getField()))
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.append(" ")
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.append(SortingField.ORDER_ASC.equals(sortingField.getOrder()) ? "ASC" : "DESC");
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}
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lambdaQuery.last("ORDER BY " + orderBy);
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// 另外个思路：https://blog.csdn.net/m0_59084856/article/details/138450913
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} else {
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throw new IllegalArgumentException("Unsupported wrapper type: " + wrapper.getClass().getName());
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}
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}
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/**
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* 将拦截器添加到链中
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* 由于 MybatisPlusInterceptor 不支持添加拦截器，所以只能全量设置
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*
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* @param interceptor 链
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* @param inner 拦截器
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* @param index 位置
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*/
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public static void addInterceptor(MybatisPlusInterceptor interceptor, InnerInterceptor inner, int index) {
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List<InnerInterceptor> inners = new ArrayList<>(interceptor.getInterceptors());
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inners.add(index, inner);
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interceptor.setInterceptors(inners);
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}
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/**
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* 获得 Table 对应的表名
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* <p>
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* 兼容 MySQL 转义表名 `t_xxx`
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*
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* @param table 表
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* @return 去除转移字符后的表名
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*/
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public static String getTableName(Table table) {
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String tableName = table.getName();
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if (tableName.startsWith(MYSQL_ESCAPE_CHARACTER) && tableName.endsWith(MYSQL_ESCAPE_CHARACTER)) {
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tableName = tableName.substring(1, tableName.length() - 1);
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}
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return tableName;
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}
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/**
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* 构建 Column 对象
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*
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* @param tableName 表名
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* @param tableAlias 别名
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* @param column 字段名
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* @return Column 对象
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*/
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public static Column buildColumn(String tableName, Alias tableAlias, String column) {
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if (tableAlias != null) {
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tableName = tableAlias.getName();
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}
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return new Column(tableName + StringPool.DOT + column);
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}
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/**
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* 跨数据库的 find_in_set 实现
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*
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* @param column 字段名称
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* @param value 查询值(不带单引号)
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* @return sql
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*/
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public static String findInSet(String column, Object value) {
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DbType dbType = JdbcUtils.getDbType();
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return DbTypeEnum.getFindInSetTemplate(dbType)
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.replace("#{column}", column)
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.replace("#{value}", StrUtil.toString(value));
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}
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/**
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* 将驼峰命名转换为下划线命名
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*
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* 使用场景：
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* 1. <a href="https://gitee.com/zhijiantianya/ruoyi-vue-pro/pulls/1357/files">fix:修复"商品统计聚合函数的别名与排序字段不符"导致的 SQL 异常</a>
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*
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* @param func 字段名函数(驼峰命名)
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* @return 字段名(下划线命名)
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*/
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public static <T> String toUnderlineCase(Func1<T, ?> func) {
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String fieldName = LambdaUtil.getFieldName(func);
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return StrUtil.toUnderlineCase(fieldName);
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}
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}
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