private void button3_Click(object sender, EventArgs e)
{
//在上面的方法中 会调用自动检测功能。 这个功能默认是开启的 当我们在做批量操作时 可以关闭这个来提高性能 .例如
//List<tb> tbs = new List<tb>();
//using (var context = new PermissionEntities())
//{
// try
// {
// context.Configuration.AutoDetectChangesEnabled = false;
// foreach (var unicorn in tbs)
// {
// context.tb.Add(unicorn);
// }
// // context.tb.AddRange(tbs);
// }
// finally
// {
// context.Configuration.AutoDetectChangesEnabled = true;
// }
//}
using (var db = new PermissionEntities())
{
string name = dataGridView1.CurrentRow.Cells[0].Value.ToString();
var tbs = db.tb.Where(t => t.name == name).FirstOrDefault();
db.tb.Remove(tbs);
//db.Entry(tbs).State = EntityState.Deleted;
db.SaveChanges();
}
}
private void button2_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
//只有.net 4.5 才行
var options = new BulkInsertOptions
{
EnableStreaming = true,
};
List <tb> entities = new List <tb>();
for (int i = 0; i < 50000; i++)
{
tb entity = new tb();
entity.name = "60000" + i;
entity.password = "******" + entity.name;
entities.Add(entity);
}
using (var db = new PermissionEntities())
{
db.BulkInsert(entities, options);
} watch.Stop();
MessageBox.Show("插入成功:耗时：" + watch.ElapsedMilliseconds);
}
private void button1_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
using (var db = new PermissionEntities())
{
//看看EF EL怎么解决
// 复用的查询
// base query
var q = db.tb.Where(t => true);
// get total count
var q1 = q.FutureCount();
// get page
var q2 = q.OrderBy(t => t.name).Skip((int.Parse(textBox1.Text.Trim()) - 1) * 1000).Take(1000).Future();
// triggers execute as a batch
int total = q1.Value;
var tasks = q2.ToList();
label1.Text = total.ToString();
dataGridView1.DataSource = tasks;
} watch.Stop();
MessageBox.Show("EntityFramework.Extension耗时：" + watch.ElapsedMilliseconds);
}
private void button1_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
List <tb> entities = new List <tb>();
using (var db = new PermissionEntities())
{
using (var transactionScope = new TransactionScope())
{
// some stuff in dbcontext
for (int i = 0; i < 20000; i++)
{
tb entity = new tb();
entity.name = "40000" + i;
entity.password = "******" + entity.name;
entities.Add(entity);
}
db.BulkInsert(entities);
//db.SaveChanges();
transactionScope.Complete();
}
} watch.Stop();
MessageBox.Show("插入成功:耗时：" + watch.ElapsedMilliseconds);
}
private void button2_Click(object sender, EventArgs e)
{
using (var db = new PermissionEntities())
{
db.tb.Where(u => u.name.Contains("4")).Delete();
}
}
private void button2_Click(object sender, EventArgs e)
{
using (var db = new PermissionEntities())
{
var tbs = db.tb.Where(t => t.name == "100").FirstOrDefault();
tbs.password = "******";
db.SaveChanges();
}
}
private void button2_Click(object sender, EventArgs e)
{
using (var enty = new PermissionEntities())
{
var lambda = lambdaBuilder1.BuildLambda <Bse_User>();
var users = enty.Bse_User.AsQueryable().Where(lambda).ToList();
dataGridView1.DataSource = users;
}
}
private List <tb> DoQuery()
{
using (var db = new PermissionEntities())
{
var tbs = db.tb.Where(p => p.name.Contains("1")).OrderBy(p => p.name);
List <tb> lstTb = tbs.ToList();
return(lstTb);
}
}
private void FrmLambdaBuilderTest_Load(object sender, EventArgs e)
{
using (var enty = new PermissionEntities())
{
var users = enty.Bse_User.ToList();
dataGridView1.DataSource = users;
}
lambdaBuilder1.Init <Bse_User>(dataGridView1);
}
private void button6_Click(object sender, EventArgs e)
{
//原生支持
using (var db = new PermissionEntities())
{
//db.tb.SqlQuery
//db.Database.SqlQuery
var tbs = db.Database.ExecuteSqlCommand("update tb set password='******' where name='100'");
}
}
private List <tb> DoQuery2()
{
using (var db = new PermissionEntities())
{
var tbs = db.Database.SqlQuery <tb>("select * from tb");
List <tb> lstTb = tbs.ToList();
return(lstTb);
}
}
private List <tb> DoQuery1()
{
using (var db = new PermissionEntities())
{
var tbs = from tbContext in db.tb
where tbContext.name.Contains("2")
orderby tbContext.name
select tbContext;
List <tb> lstTb = tbs.ToList();
return(lstTb);
}
}
private void button4_Click(object sender, EventArgs e)
{
using (var db = new PermissionEntities())
{
db.tb.Update(
u => u.name.Contains("2"),
u2 => new tb {
password = "******"
});
//或者 db.tb.Where(u => u.name == "2").Update(u => new tb { password = "******" });
}
}
private void button1_Click(object sender, EventArgs e)
{
string name = dataGridView1.CurrentRow.Cells[0].Value.ToString();
using (var db = new PermissionEntities())
{
db.tb.Where(u => u.name == name).Delete();
//或者
// db.tb.Delete(u => u.name == "101");
//不需要db.SaveChanges();
}
}
private void button8_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
using (var db = new PermissionEntities())
{
db.tb.Where(t => t.name.Contains("2")).OrderBy(t => t.name).AsNoTracking().ToList();
} watch.Stop();
MessageBox.Show("耗时：" + watch.ElapsedMilliseconds);
}
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
using (var dbcontext = new PermissionEntities())
{
var objectContext = ((IObjectContextAdapter)dbcontext).ObjectContext;
var mappingCollection = (StorageMappingItemCollection)objectContext.MetadataWorkspace.GetItemCollection(DataSpace.CSSpace);
mappingCollection.GenerateViews(new List <EdmSchemaError>());
}
Application.Run(new FrmMainBase());
}
private void button7_Click(object sender, EventArgs e)
{
//EF一定要有主键，否则报错
using (var enty = new PermissionEntities())
{
tb aa = new tb();
aa.name = "10000";
aa.password = "******" + aa.name;
enty.tb.Add(aa);
enty.tb.Attach(aa);
enty.SaveChanges();
}
}
private void button5_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
using (var db = new PermissionEntities())
{
var query = db.tb.Where(t => true).OrderBy(t => t.name);
//用skip之前必须OrderBy
PagerResultModel <tb> tbs = PagerExtension.ToPager <tb>(query, 1000, int.Parse(textBox1.Text.Trim()));
label1.Text = tbs.Count.ToString();
dataGridView1.DataSource = tbs.List;
} watch.Stop();
MessageBox.Show("ExfSoft.EntityFramework.Extension耗时：" + watch.ElapsedMilliseconds);
}
private void button1_Click(object sender, EventArgs e)
{
//EF一定要有主键，否则报错
using (var enty = new PermissionEntities())
{
for (int i = 0; i < 200; i++)
{
tb aa = new tb();
aa.name = (200 + i).ToString();
aa.password = "******" + aa.name;
enty.tb.Add(aa);
}
enty.SaveChanges();
}
MessageBox.Show("成功");
}
private void button5_Click(object sender, EventArgs e)
{
using (var db = new PermissionEntities())
{
//看看EF EL怎么解决
// 复用的查询
// base query
var q = db.tb.Where(t => t.name.Contains("1"));
// get total count
var q1 = q.FutureCount();
// get page
var q2 = q.OrderBy(t => t.name).Skip((int.Parse(textBox1.Text.Trim()) - 1) * 10).Take(10).Future();
// triggers execute as a batch
int total = q1.Value;
var tasks = q2.ToList();
label1.Text = total.ToString();
dataGridView1.DataSource = tasks;
}
}
private void button5_Click(object sender, EventArgs e)
{
Stopwatch watch = new Stopwatch();
watch.Reset();
watch.Start();
List <tb> tbs = new List <tb>();
for (int i = 0; i < 10000; i++)
{
tb entity = new tb();
entity.name = "10000" + i;
entity.password = "******" + entity.name;
tbs.Add(entity);
}
using (var db = new PermissionEntities())
{
db.BulkInsert(tbs);
}
watch.Stop();
MessageBox.Show("插入成功:耗时：" + watch.ElapsedMilliseconds);
}
