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错误信息：

中文提示 :  连接数据库过程中发生错误，检查服务器是否正常连接字符串是否正确，错误信息：Cannot Open when State is Connecting.DbType="MySql";ConfigId="0".
English Message : Connection open error . Cannot Open when State is Connecting.DbType="MySql";ConfigId="0" at SqlSugar.Check.Exception(Boolean isException, String message, String[] args)at SqlSugar.AdoProvider.CheckConnection()at SqlSugar.AdoProvider.BeginTran()at WaterCloud.Service.AutoJob.JobExecute.<>c__DisplayClass5_0.<<Execute>b__0>d.MoveNext() in E:\WaterCloud\WaterCloud.Service\AutoJob\JobExecute.cs:line 183

导致该问题的原因是连续两次请求或插入更新时，第一操作后，在第二次操作时，第一次的句柄未完全释放，使第二次操作使用该句柄时，句柄还处于链接状态。

解决方案：使用sqlsugar中的.CopyNew()方法，在每次操作时都使用新的数据库链接

在项目文件中修改内容

文件路径：E:\项目路径\WaterCloud.Data\Repository\RepositoryBase.cs

/******************************************************************************** Copyright © 2020 WaterCloud.Framework 版权所有* Author: WaterCloud* Description: WaterCloud快速开发平台* Website：
*********************************************************************************/using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Threading.Tasks;
using WaterCloud.Code;namespace WaterCloud.DataBase
{/// <summary>/// 泛型仓储实现/// </summary>/// <typeparam name="TEntity"></typeparam>public class RepositoryBase<TEntity> where TEntity : class, new(){// 用于其他表操作public ITenant Tenant{get { return _tenant; }}private ITenant _tenant;private SqlSugarScopeProvider _db;public SqlSugarScopeProvider Db{get { return _db; }}/// <summary>/// 切换上下文，不传参切换到实体租户/// </summary>/// <param name="configId"></param>/// <returns></returns>public ISqlSugarClient ChangeEntityDb(object configId = null){if (!configId.IsEmpty()){_db = _tenant.GetConnectionScope(configId);}else{_db = _tenant.GetConnectionScopeWithAttr<TEntity>();}return _db;}public RepositoryBase(ISqlSugarClient scope){_tenant = scope.AsTenant();_db = Tenant.GetConnectionScopeWithAttr<TEntity>();}public async Task<TEntity> Insert(TEntity entity){return await _db.Insertable(entity).ExecuteReturnEntityAsync();}public async Task<int> Insert(List<TEntity> entitys){return await _db.CopyNew().Insertable(entitys).ExecuteCommandAsync();}public async Task<int> Update(TEntity entity){return await _db.CopyNew().Updateable(entity).IgnoreColumns(ignoreAllNullColumns: true).ExecuteCommandAsync();}public async Task<int> Update(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, TEntity>> content){return await _db.CopyNew().Updateable(content).Where(predicate).ExecuteCommandAsync();}public async Task<int> Delete(TEntity entity){return await _db.CopyNew().Deleteable(entity).ExecuteCommandAsync();}public async Task<int> Delete(Expression<Func<TEntity, bool>> predicate){return await _db.CopyNew().Deleteable(predicate).ExecuteCommandAsync();}public async Task<TEntity> FindEntity(object keyValue){return await IQueryable().InSingleAsync(keyValue);}public async Task<TEntity> FindEntity(Expression<Func<TEntity, bool>> predicate){return await IQueryable().FirstAsync(predicate);}public ISugarQueryable<TEntity> IQueryable(){return _db.CopyNew().Queryable<TEntity>();}public ISugarQueryable<TEntity> IQueryable(Expression<Func<TEntity, bool>> predicate){return IQueryable().Where(predicate);}public ISugarQueryable<TEntity> IQueryable(string strSql){return _db.CopyNew().SqlQueryable<TEntity>(strSql);}}
}

在对应的增删改查操作中加入.CopyNew()方法