private List <StudentInfo> DoQuery1()
{
using (var db = new studentEntities())
{
return(db.StudentInfo.OrderByDescending(t => t.Id).ToList());;
}
}
private List <StudentInfo> DoQueryCache2()
{
List <StudentInfo> tbs = null;
using (var db = new studentEntities())
{
tbs = db.StudentInfo.Cacheable <StudentInfo>().OrderByDescending(t => t.Id).ToList(); // Async methods are supported too.
}
return(tbs);
}
private List <StudentInfo> NoCacheQuery()
{
List <StudentInfo> tbs = null;
using (var db = new studentEntities())
{
tbs = db.StudentInfo.OrderByDescending(t => t.Id).AsNoTracking().ToList();;
}
return(tbs);
}
private void button2_Click(object sender, EventArgs e)
{
int id = int.Parse(dataGridView1.CurrentRow.Cells[0].Value.ToString());
using (var db = new studentEntities())
{
var tbs = db.StudentInfo.Where(t => t.Id == id).FirstOrDefault();
tbs.Name = "更新" + Name + DateTime.Now.ToString();
db.SaveChanges();
}
MessageBox.Show("更新成功");
FrmMainCache_Load(null, null);
}
private void 原始查询()
{
using (var db = new studentEntities())
{
string str1;
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
//var tbs1 = db.StudentInfo.OrderByDescending(t => t.Id).AsNoTracking().ToList();
var tbs1 = db.StudentInfo.OrderByDescending(t => t.Id);
watch.Stop();
str1 = watch.ElapsedMilliseconds.ToString();
MessageBox.Show("耗时：" + System.Environment.NewLine + "原始查询:" + str1 + "数量：" + tbs1.ToList().Count.ToString());
}
}
private void button6_Click(object sender, EventArgs e)
{
int intnum = int.Parse(textBox1.Text.Trim());
List <StudentInfo> tbs = new List <StudentInfo>();
for (int i = intnum; i < intnum + 10000; i++)
{
StudentInfo aa = new StudentInfo();
aa.Addess = "地址" + intnum;
aa.Age = i + 1;
aa.Cid = i;
aa.Name = "姓名" + i;
tbs.Add(aa);
}
using (var db = new studentEntities())
{
db.BulkInsert(tbs);
}
MessageBox.Show("批量插入成功");
}
private void button1_Click(object sender, EventArgs e)
{
int intnum = int.Parse(textBox1.Text.Trim());
//EF一定要有主键，否则报错
using (var enty = new studentEntities())
{
for (int i = intnum; i < intnum + 100; i++)
{
StudentInfo aa = new StudentInfo();
aa.Addess = "地址" + intnum;
aa.Age = i + 1;
aa.Cid = i;
aa.Name = "姓名" + i;
enty.StudentInfo.Add(aa);
}
enty.SaveChanges();
}
MessageBox.Show("成功");
FrmMainCache_Load(null, null);
}
private void DoQueryCache3()
{
using (var db = new studentEntities())
{
string str1; string str2;
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
//var tbs1 = db.StudentInfo.OrderByDescending(t => t.Id).AsNoTracking().ToList();
var tbs1 = db.StudentInfo.OrderByDescending(t => t.Id);;
watch.Stop();
str1 = watch.ElapsedMilliseconds.ToString();
watch.Reset();
watch.Start();
//var tbs2 = db.StudentInfo.Cacheable<StudentInfo>().OrderByDescending(t => t.Id).ToList(); // Async methods are supported too.
var tbs2 = db.StudentInfo.Cacheable().OrderByDescending(t => t.Id);;
watch.Stop();
str2 = watch.ElapsedMilliseconds.ToString();
MessageBox.Show("耗时：" + System.Environment.NewLine + "NOCache:" + str1 + "数量：" + tbs1.ToList().Count.ToString() + System.Environment.NewLine + "Cache1:" + str2 + "数量：" + tbs2.ToList().Count.ToString());
}
}
private void button11_Click(object sender, EventArgs e)
{
new EFCacheServiceProvider().ClearAllCachedEntries();
using (var context = new studentEntities())
{
var databaseLog = new StringBuilder();
context.Database.Log = commandLine =>
{
databaseLog.AppendLine(commandLine);
Trace.Write(commandLine);
};
Trace.WriteLine("a normal query");
var product1IncludeTags = context.StudentInfo.Where(t => t.Id > 10);
Trace.WriteLine("1st query using Include method.");
databaseLog.Clear();
var debugInfo1 = new EFCacheDebugInfo();
var firstPoductIncludeTags = context.StudentInfo.Cacheable(debugInfo1).Where(t => t.Id > 10);
//var hash1 = debugInfo1.EFCacheKey.KeyHash;
//var cacheDependencies1 = debugInfo1.EFCacheKey.CacheDependencies;
Trace.WriteLine(
@"2nd query looks the same, but it doesn't have the Include method, so it shouldn't produce the same queryKeyHash.
This was the problem with just parsing the LINQ expression, without considering the produced SQL.");
databaseLog.Clear();
var debugInfo2 = new EFCacheDebugInfo();
var firstPoduct = context.StudentInfo.Cacheable(debugInfo2).Where(t => t.Id > 10);
//var hash2 = debugInfo2.EFCacheKey.KeyHash;
//var cacheDependencies2 = debugInfo2.EFCacheKey.CacheDependencies;
//MessageBox.Show(product1IncludeTags.ToList().Count.ToString() + "----" + firstPoductIncludeTags.ToList().Count.ToString() + "----" + firstPoduct.ToList().Count.ToString());
}
}
private void button10_Click(object sender, EventArgs e)
{
using (var context = new studentEntities())
{
var databaseLog = new StringBuilder();
context.Database.Log = commandLine =>
{
databaseLog.AppendLine(commandLine);
Trace.Write(commandLine);
};
Trace.WriteLine("a normal query");
var product1IncludeTags = context.StudentInfo.FirstOrDefault();
Trace.WriteLine("1st query using Include method.");
databaseLog.Clear();
var debugInfo1 = new EFCacheDebugInfo();
var firstPoductIncludeTags = context.StudentInfo
.Cacheable(debugInfo1)
.FirstOrDefault();
var hash1 = debugInfo1.EFCacheKey.KeyHash;
var cacheDependencies1 = debugInfo1.EFCacheKey.CacheDependencies;
Trace.WriteLine(
@"2nd query looks the same, but it doesn't have the Include method, so it shouldn't produce the same queryKeyHash.
This was the problem with just parsing the LINQ expression, without considering the produced SQL.");
databaseLog.Clear();
var debugInfo2 = new EFCacheDebugInfo();
var firstPoduct = context.StudentInfo.Cacheable(debugInfo2)
.FirstOrDefault();
var hash2 = debugInfo2.EFCacheKey.KeyHash;
var cacheDependencies2 = debugInfo2.EFCacheKey.CacheDependencies;
}
}
