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添加捐赠和部分使用代码
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‎README-zh.md‎

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---
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- [Gitee](https://gitee.com/dotnetchina/sharding-core) 国内镜像
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- [捐赠](#捐赠)
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## 社区合作伙伴和赞助商
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凭借各大开源生态圈提供的优秀代码和思路才有的这个框架,希望可以为.Net生态提供一份微薄之力,该框架本人会一直长期维护,有大神技术支持可以联系下方方式欢迎star :)
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# 捐赠
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<img src="./imgs/zfb.jpg" title="JetBrains" width=200 />
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<img src="./imgs/wx.jpg" title="JetBrains" width=222 />
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[博客](https://www.cnblogs.com/xuejiaming)
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QQ群:771630778

‎README.md‎

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---
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- [Gitee](https://gitee.com/dotnetchina/sharding-core) 国内镜像
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- [捐赠](#捐赠)
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## Community Partners and Sponsors
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凭借各大开源生态圈提供的优秀代码和思路才有的这个框架,希望可以为.Net生态提供一份微薄之力,该框架本人会一直长期维护,有大神技术支持可以联系下方方式欢迎star :)
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# 捐赠
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<img src="./imgs/zfb.jpg" title="JetBrains" width=200 />
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<img src="./imgs/wx.jpg" title="JetBrains" width=222 />
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[博客](https://www.cnblogs.com/xuejiaming)
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QQ群:771630778

‎imgs/wx.jpg‎

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‎imgs/zfb.jpg‎

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‎samples/Sample.MySql/Controllers/DbSetDiscoverExpressionVisitor.cs‎

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using System.Linq.Expressions;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.EntityFrameworkCore.Internal;
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using Microsoft.EntityFrameworkCore.Query;
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using ShardingCore.Extensions;
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namespace Sample.MySql.Controllers;
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public class DbSetDiscoverExpressionVisitor<TEntity>:ExpressionVisitor where TEntity:class
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{
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private readonly DbContext _dbContext;
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public DbSet<TEntity> DbSet { get; private set; }
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public DbSetDiscoverExpressionVisitor(DbContext dbContext)
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{
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_dbContext = dbContext;
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}
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protected override Expression VisitExtension(Expression node)
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{
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if (node is QueryRootExpression queryRootExpression)
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{
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var dbContextDependencies =
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typeof(DbContext).GetTypePropertyValue(_dbContext, "DbContextDependencies") as IDbContextDependencies;
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var targetIQ =
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((IDbSetCache)_dbContext).GetOrAddSet(dbContextDependencies.SetSource, queryRootExpression.EntityType.ClrType);
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DbSet = (DbSet<TEntity>)targetIQ;
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}
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return base.VisitExtension(node);
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}
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}

‎samples/Sample.MySql/Controllers/WeatherForecastController.cs‎

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[HttpGet]
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public async Task<IActionResult> Get()
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{
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OtherDbContext.CurrentId = "";
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var myUsers0 = _otherDbContext.MyUsers.ToList();
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OtherDbContext.CurrentId = "123";
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var myUsers1 = _otherDbContext.MyUsers.ToList();
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OtherDbContext.CurrentId = "456";
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var myUsers2= _otherDbContext.MyUsers.ToList();
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// var sysUserModQueryable = _otherDbContext.MyUsers.Where(o => o.Id == "2");
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// var dbSetDiscoverExpressionVisitor = new DbSetDiscoverExpressionVisitor<MyUser>(_otherDbContext);
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// dbSetDiscoverExpressionVisitor.Visit(sysUserModQueryable.Expression);
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// var myUsers = dbSetDiscoverExpressionVisitor.DbSet;
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// Console.WriteLine("------------");
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// using (var tran = _defaultTableDbContext.Database.BeginTransaction())
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// {
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‎samples/Sample.MySql/Startup.cs‎

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{
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builder.UseMySql(conStr, new MySqlServerVersion(new Version()))
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.UseLoggerFactory(efLogger)
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.EnableSensitiveDataLogging()
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.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
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});
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o.UseShardingTransaction((connection, builder) =>
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{
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builder
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.UseMySql(connection, new MySqlServerVersion(new Version()))
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.UseLoggerFactory(efLogger)
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.EnableSensitiveDataLogging()
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.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
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});
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o.UseShardingMigrationConfigure(b =>
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{
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builder.UseMySql(conStr, new MySqlServerVersion(new Version()))
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.UseLoggerFactory(efLogger)
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.EnableSensitiveDataLogging()
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.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
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});
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o.UseShardingTransaction((connection, builder) =>
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{
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builder
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.UseMySql(connection, new MySqlServerVersion(new Version()))
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.UseLoggerFactory(efLogger)
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.EnableSensitiveDataLogging()
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.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
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});
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o.AddDefaultDataSource("ds0",
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{ "ds1", "server=127.0.0.1;port=3306;database=dbdbd1;userid=root;password=root;" },
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{ "ds2", "server=127.0.0.1;port=3306;database=dbdbd2;userid=root;password=root;" }
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});
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// o.AddReadWriteSeparation(sp =>
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// {
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// return new Dictionary<string, IEnumerable<string>>()
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// {
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// {
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// "ds0",
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// new[]
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// {
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// "server=127.0.0.1;port=3306;database=dbdbd0_0;userid=root;password=root;"
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// }
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// }
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// };
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// }, defaultEnable: true, readStrategyEnum: ReadStrategyEnum.Loop,
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// readConnStringGetStrategy: ReadConnStringGetStrategyEnum.LatestEveryTime);
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o.UseShardingMigrationConfigure(b =>
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{
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b.ReplaceService<IMigrationsSqlGenerator, ShardingMySqlMigrationsSqlGenerator>();

‎samples/Sample.MySql/appsettings.Development.json‎

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{
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"Logging": {
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"LogLevel": {
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"Default": "Debug",
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"Default": "Information",
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"Microsoft": "Warning",
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"Microsoft.Hosting.Lifetime": "Information"
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}

‎samples/Sample.MySql/multi/OtherDbContext.cs‎

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{
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}
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public static string CurrentId;
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public string CID => CurrentId;
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public bool HasCID => !string.IsNullOrWhiteSpace(CID);
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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base.OnModelCreating(modelBuilder);
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modelBuilder.Entity<MyUser>()
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.HasQueryFilter(o => !HasCID || o.Id == CID);
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}
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public IRouteTail RouteTail { get; set; }
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}

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