Dapper学习(四)之Dapper Plus的大数据量的操做

这篇文章主要讲 Dapper Plus，它使用用来操做大数量的一些操做的。好比插入1000条，或者10000条的数据时，再使用Dapper的Execute方法，就会比较慢了。这时候，能够使用Dapper Plus中的方法进行操做，提升速度。

主要包括下面：

• Bulk Insert
• Bulk Update
• Bulk Delete
• Bulk Merge

使用以前，须要在Nuget中，安装 Z.Dapper.Plus 

注意：这个组件是收费的，每一个月会有一个试用版本，没有免费版本

另一种提升批量插入速度的方式：经过把多个插入语句经过字符串拼接使成为一个长的sql语句来实现。

1. Bulk Insert:批量插入

1.1 Insert Single : 使用Bulk插入单个实体

DapperPlusManager.Entity<Customer>().Table("Customers"); 

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkInsert(new List<Customer>() { new Customer() { CustomerName = "ExampleBulkInsert", ContactName = "Example Name :" +  1}});
}

1.2 Insert Many ：插入多个实体

DapperPlusManager.Entity<Customer>().Table("Customers"); 

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkInsert(customers);
}

1.3 Insert with relation（One to One）

插入一对一关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{    
    connection.BulkInsert(suppliers).ThenForEach(x => x.Product.SupplierID = x.SupplierID).ThenBulkInsert(x => x.Product);
}

1.4 Insert with relation (One to Many)

插入一对多关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID); 
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);     

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{    
    connection.BulkInsert(suppliers).ThenForEach(x => x.Products.ForEach(y => y.SupplierID =  x.SupplierID)).ThenBulkInsert(x => x.Products);
}

2. Bulk Update

2.1 Update Single 和 Update Many

DapperPlusManager.Entity<Customer>().Table("Customers"); 

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkUpdate(customers);
}

2.2 Update with relation(One to One) 和 Update with relation(One to Many)

更新一对一关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{    
    connection.BulkUpdate(suppliers, x => x.Product);
}

更新一对多关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkUpdate(suppliers, x => x.Products);
}

3. Bulk Delete

3.1 Delete Single 

删除单个实体

DapperPlusManager.Entity<Customer>().Table("Customers").Key("CustomerID");

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkDelete(connection.Query<Customer>("Select * FROM CUSTOMERS WHERE CustomerID in (53,57) ").ToList());
}

3.2 Delete Many

删除多个实体

DapperPlusManager.Entity<Customer>().Table("Customers").Key("CustomerID");

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkDelete(connection.Query<Customer>("Select * FROM CUSTOMERS WHERE CustomerID in (53,57) ").ToList());
}

3.3 Delete with relation（One to One）

删除一对一关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkDelete(suppliers.Select(x => x.Product)).BulkDelete(suppliers);
}

3.4 Delete with relation（One to Many）

删除一对多关系的实体

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkDelete(suppliers.SelectMany(x => x.Products)).BulkDelete(suppliers);
}

4.Bulk Merge

4.1 Merge Single

DapperPlusManager.Entity<Customer>().Table("Customers"); 

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkMerge(new List<Customer>() { new Customer() { CustomerName = "ExampleBulkMerge", ContactName = "Example Name :" +  1}});
}

4.2 Merge Many

DapperPlusManager.Entity<Customer>().Table("Customers"); 

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkMerge(customers);
}

4.3 Merge with relation(One to One)

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{    
    connection.BulkMerge(suppliers).ThenForEach(x => x.Product.SupplierID = x.SupplierID).ThenBulkMerge(x => x.Product);
}

4.4 Merge with relation(One to Many)

DapperPlusManager.Entity<Supplier>().Table("Suppliers").Identity(x => x.SupplierID);
DapperPlusManager.Entity<Product>().Table("Products").Identity(x => x.ProductID);

using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools()))
{
    connection.BulkMerge(suppliers).ThenForEach(x => x.Products.ForEach(y => y.SupplierID =  x.SupplierID)).ThenBulkMerge(x => x.Products);
}