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Mark J Price 2022-09-19 14:16:37 +01:00
parent 49387f9c3f
commit 21a652df69
6 changed files with 222 additions and 58 deletions
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64
vs4win/Chapter10/WorkingWithEFCore/Program.Modifications.cs
View file

@ -1,10 +1,11 @@
using Microsoft.EntityFrameworkCore.ChangeTracking; // EntityEntry<T>
using Microsoft.EntityFrameworkCore; // ExecuteUpdate, ExecuteDelete
using Microsoft.EntityFrameworkCore.ChangeTracking; // EntityEntry<T>
using Microsoft.EntityFrameworkCore.Storage; // IDbContextTransaction
using Packt.Shared;
using Packt.Shared; // Northwind, Product
partial class Program
{
static void ListProducts(int? productIdToHighlight = null)
static void ListProducts(int[]? productIdsToHighlight = null)
{
using (Northwind db = new())
{
@ -21,7 +22,8 @@ partial class Program
{
ConsoleColor previousColor = ForegroundColor;
if (productIdToHighlight == p.ProductId)
if ((productIdsToHighlight is not null) &&
productIdsToHighlight.Contains(p.ProductId))
{
ForegroundColor = ConsoleColor.Green;
}
@ -39,6 +41,8 @@ partial class Program
{
using (Northwind db = new())
{
if (db.Products is null) return (0, 0);
Product p = new()
{
CategoryId = categoryId,
@ -64,7 +68,9 @@ partial class Program
{
using (Northwind db = new())
{
// get first product whose name starts with name
if (db.Products is null) return (0, 0);
// Get the first product whose name starts with name.
Product updateProduct = db.Products.First(
p => p.ProductName.StartsWith(productNameStartsWith));
@ -86,15 +92,16 @@ partial class Program
arg0: t.GetDbTransaction().IsolationLevel);
IQueryable<Product>? products = db.Products?.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
p => p.ProductName.StartsWith(productNameStartsWith));
if (products is null)
if ((products is null) || (!products.Any()))
{
WriteLine("No products found to delete.");
return 0;
}
else
{
if (db.Products is null) return 0;
db.Products.RemoveRange(products);
}
@ -104,4 +111,47 @@ partial class Program
}
}
}
static (int affected, int[]? productIds) IncreaseProductPricesBetter(
string productNameStartsWith, decimal amount)
{
using (Northwind db = new())
{
if (db.Products is null) return (0, null);
// Get products whose name starts with name.
IQueryable<Product>? products = db.Products.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
int affected = products.ExecuteUpdate(s => s.SetProperty(
p => p.Cost, // Property selector lambda expression.
p => p.Cost + amount)); // Value to update to lambda expression.
int[] productIds = products.Select(p => p.ProductId).ToArray();
return (affected, productIds);
}
}
static int DeleteProductsBetter(string productNameStartsWith)
{
using (Northwind db = new())
{
int affected = 0;
IQueryable<Product>? products = db.Products?.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
if ((products is null) || (!products.Any()))
{
WriteLine("No products found to delete.");
return 0;
}
else
{
affected = products.ExecuteDelete();
}
return affected;
}
}
}

50
vs4win/Chapter10/WorkingWithEFCore/Program.cs
View file

@ -1,42 +1,59 @@
using Packt.Shared;
/*
Northwind db = new();
WriteLine($"Provider: {db.Database.ProviderName}");
*/
// QueryingCategories();
//FilteredIncludes();
// FilteredIncludes();
//QueryingProducts();
// QueryingProducts();
//QueryingWithLike();
//GetRandomProduct();
/*
var resultAdd = AddProduct(categoryId: 6,
productName: "Bob's Burgers", price: 500M);
if (resultAdd.affected == 1)
{
WriteLine("Add product successful.");
WriteLine($"Add product successful with ID: {resultAdd.productId}.");
}
ListProducts(productIdToHighlight: resultAdd.productId);
ListProducts(productIdsToHighlight: new[] { resultAdd.productId });
*/
/*
var resultUpdate = IncreaseProductPrice(
productNameStartsWith: "Bob", amount: 20M);
if (resultUpdate.affected == 1)
{
WriteLine($"Increase price success for ID: {resultUpdate.productId}.");
}
ListProducts(productIdsToHighlight: new[] { resultUpdate.productId });
*/
/*
var resultUpdateBetter = IncreaseProductPricesBetter(
productNameStartsWith: "Bob", amount: 20M);
if (resultUpdateBetter.affected > 0)
{
WriteLine("Increase product price successful.");
}
ListProducts(productIdToHighlight: resultUpdate.productId);
ListProducts(productIdsToHighlight: resultUpdateBetter.productIds);
*/
/*
WriteLine("About to delete all products whose name starts with Bob.");
Write("Press Enter to continue: ");
Write("Press Enter to continue or any other key to exit: ");
if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
{
int deleted = DeleteProducts(productNameStartsWith: "Bob");
@ -45,4 +62,19 @@ if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
else
{
WriteLine("Delete was canceled.");
}
}
*/
/*
WriteLine("About to delete all products whose name starts with Bob.");
Write("Press Enter to continue or any other key to exit: ");
if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
{
int deleted = DeleteProductsBetter(productNameStartsWith: "Bob");
WriteLine($"{deleted} product(s) were deleted.");
}
else
{
WriteLine("Delete was canceled.");
}
*/

26
vs4win/Chapter10/WorkingWithEFCore/WorkingWithEFCore.csproj
View file

@ -7,20 +7,20 @@
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<Using Include="System.Console" Static="true" />
</ItemGroup>
<ItemGroup>
<Using Include="System.Console" Static="true" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="7.0.0-*" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="7.0.0-*" />
</ItemGroup>
<ItemGroup>
<None Update="Northwind.db">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
</ItemGroup>
<ItemGroup>
<None Update="Northwind.db">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
</ItemGroup>
</Project>

64
vscode/Chapter10/WorkingWithEFCore/Program.Modifications.cs
View file

@ -1,10 +1,11 @@
using Microsoft.EntityFrameworkCore.ChangeTracking; // EntityEntry<T>
using Microsoft.EntityFrameworkCore; // ExecuteUpdate, ExecuteDelete
using Microsoft.EntityFrameworkCore.ChangeTracking; // EntityEntry<T>
using Microsoft.EntityFrameworkCore.Storage; // IDbContextTransaction
using Packt.Shared;
using Packt.Shared; // Northwind, Product
partial class Program
{
static void ListProducts(int? productIdToHighlight = null)
static void ListProducts(int[]? productIdsToHighlight = null)
{
using (Northwind db = new())
{
@ -21,7 +22,8 @@ partial class Program
{
ConsoleColor previousColor = ForegroundColor;
if (productIdToHighlight == p.ProductId)
if ((productIdsToHighlight is not null) &&
productIdsToHighlight.Contains(p.ProductId))
{
ForegroundColor = ConsoleColor.Green;
}
@ -39,6 +41,8 @@ partial class Program
{
using (Northwind db = new())
{
if (db.Products is null) return (0, 0);
Product p = new()
{
CategoryId = categoryId,
@ -64,7 +68,9 @@ partial class Program
{
using (Northwind db = new())
{
// get first product whose name starts with name
if (db.Products is null) return (0, 0);
// Get the first product whose name starts with name.
Product updateProduct = db.Products.First(
p => p.ProductName.StartsWith(productNameStartsWith));
@ -86,15 +92,16 @@ partial class Program
arg0: t.GetDbTransaction().IsolationLevel);
IQueryable<Product>? products = db.Products?.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
p => p.ProductName.StartsWith(productNameStartsWith));
if (products is null)
if ((products is null) || (!products.Any()))
{
WriteLine("No products found to delete.");
return 0;
}
else
{
if (db.Products is null) return 0;
db.Products.RemoveRange(products);
}
@ -104,4 +111,47 @@ partial class Program
}
}
}
static (int affected, int[]? productIds) IncreaseProductPricesBetter(
string productNameStartsWith, decimal amount)
{
using (Northwind db = new())
{
if (db.Products is null) return (0, null);
// Get products whose name starts with name.
IQueryable<Product>? products = db.Products.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
int affected = products.ExecuteUpdate(s => s.SetProperty(
p => p.Cost, // Property selector lambda expression.
p => p.Cost + amount)); // Value to update to lambda expression.
int[] productIds = products.Select(p => p.ProductId).ToArray();
return (affected, productIds);
}
}
static int DeleteProductsBetter(string productNameStartsWith)
{
using (Northwind db = new())
{
int affected = 0;
IQueryable<Product>? products = db.Products?.Where(
p => p.ProductName.StartsWith(productNameStartsWith));
if ((products is null) || (!products.Any()))
{
WriteLine("No products found to delete.");
return 0;
}
else
{
affected = products.ExecuteDelete();
}
return affected;
}
}
}

50
vscode/Chapter10/WorkingWithEFCore/Program.cs
View file

@ -1,42 +1,59 @@
using Packt.Shared;
/*
Northwind db = new();
WriteLine($"Provider: {db.Database.ProviderName}");
*/
// QueryingCategories();
//FilteredIncludes();
// FilteredIncludes();
//QueryingProducts();
// QueryingProducts();
//QueryingWithLike();
//GetRandomProduct();
/*
var resultAdd = AddProduct(categoryId: 6,
productName: "Bob's Burgers", price: 500M);
if (resultAdd.affected == 1)
{
WriteLine("Add product successful.");
WriteLine($"Add product successful with ID: {resultAdd.productId}.");
}
ListProducts(productIdToHighlight: resultAdd.productId);
ListProducts(productIdsToHighlight: new[] { resultAdd.productId });
*/
/*
var resultUpdate = IncreaseProductPrice(
productNameStartsWith: "Bob", amount: 20M);
if (resultUpdate.affected == 1)
{
WriteLine($"Increase price success for ID: {resultUpdate.productId}.");
}
ListProducts(productIdsToHighlight: new[] { resultUpdate.productId });
*/
/*
var resultUpdateBetter = IncreaseProductPricesBetter(
productNameStartsWith: "Bob", amount: 20M);
if (resultUpdateBetter.affected > 0)
{
WriteLine("Increase product price successful.");
}
ListProducts(productIdToHighlight: resultUpdate.productId);
ListProducts(productIdsToHighlight: resultUpdateBetter.productIds);
*/
/*
WriteLine("About to delete all products whose name starts with Bob.");
Write("Press Enter to continue: ");
Write("Press Enter to continue or any other key to exit: ");
if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
{
int deleted = DeleteProducts(productNameStartsWith: "Bob");
@ -45,4 +62,19 @@ if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
else
{
WriteLine("Delete was canceled.");
}
}
*/
/*
WriteLine("About to delete all products whose name starts with Bob.");
Write("Press Enter to continue or any other key to exit: ");
if (ReadKey(intercept: true).Key == ConsoleKey.Enter)
{
int deleted = DeleteProductsBetter(productNameStartsWith: "Bob");
WriteLine($"{deleted} product(s) were deleted.");
}
else
{
WriteLine("Delete was canceled.");
}
*/

26
vscode/Chapter10/WorkingWithEFCore/WorkingWithEFCore.csproj
View file

@ -7,20 +7,20 @@
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<Using Include="System.Console" Static="true" />
</ItemGroup>
<ItemGroup>
<Using Include="System.Console" Static="true" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="7.0.0-*" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.0-*" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="7.0.0-*" />
</ItemGroup>
<ItemGroup>
<None Update="Northwind.db">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
</ItemGroup>
<ItemGroup>
<None Update="Northwind.db">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
</ItemGroup>
</Project>