public void TestJoin()
{
var connection = new Npgsql.NpgsqlConnection("Server=127.0.0.1;Port=5432;User Id=postgres;Password=1024;Database=test;");
using (IDbContext db = new DbProxyContext(connection, DbContextType.Postgresql))
{
db.Open();
var list0 = db.From <Student, Stuclass>()
.Join((a, b) => a.Id == b.Sid)
.OrderBy((a, b) => a.Id)
.OrderByDescending((a, b) => b.Id)
.Select((a, b) => new
{
a.Id,
a.Name,
Class = b.Name
}).ToList();
var(list1, total1) = db.From <Student, Stuclass>()
.Join((a, b) => a.Id == b.Sid)
.Page(1, 2)
.SelectMany((a, b) => new
{
a.Id,
a.Name,
Class = b.Name
});
var(list2, total2) = db.From <Student, Stuclass>()
.Join((a, b) => a.Id == b.Sid)
.GroupBy((a, b) => b.Name)
.Page(1, 2)
.SelectMany((a, b) => new
{
Class = b.Name,
Count = SqlFun.COUNT(1L),
//StuNames = SqlFun.GROUP_CONCAT(a.Name)
});
var list3 = db.From <Student, Stuclass, Stuid>()
.Join((Student a, Stuclass b) => a.Id == b.Sid)
.Join((Student a, Stuid b) => a.Id == b.Sid)
.Select((a, b, c) => new
{
a.Id,
b.Name,
c.IdNum
}).ToList();
}
}
public void TestGroup()
{
var connection = new MySql.Data.MySqlClient.MySqlConnection("server=localhost;user id=root;password=1024;database=test;");
using (IDbContext db = new DbProxyContext(connection, DbContextType.Mysql))
{
db.Open();
var list = db.From <Student>()
.GroupBy(a => a.Name)
.Having(a => SqlFun.COUNT(1L) > 1)
.OrderByDescending(a => SqlFun.COUNT(1))
.Select(s => new
{
s.Name,
Names = SqlFun.GROUP_CONCAT(s.Name),
Count = SqlFun.COUNT(1L),
Balance = SqlFun.SUM(s.Balance)
}).ToList();
}
}
public void TestGroup()
{
var connection = new Npgsql.NpgsqlConnection("Server=127.0.0.1;Port=5432;User Id=postgres;Password=1024;Database=test;");
using (IDbContext db = new DbProxyContext(connection, DbContextType.Postgresql))
{
db.Open();
var list = db.From <Student>()
.GroupBy(a => a.Name)
.Having(a => SqlFun.COUNT(1L) > 1)
.OrderByDescending(a => SqlFun.COUNT(1))
.Select(s => new
{
s.Name,
//Names = SqlFun.GROUP_CONCAT(s.Name),
Count = SqlFun.COUNT(1L),
Balance = SqlFun.SUM(s.Balance)
}).ToList();
}
}
public void TestGroup()
{
var connection = new System.Data.SqlClient.SqlConnection(@"Data Source=DESKTOP-9IS2HA6\SQLEXPRESS;Initial Catalog=test;Persist Security Info=True;User ID=sa;Password=1024");
using (IDbContext db = new DbProxyContext(connection, DbContextType.SqlServer))
{
db.Open();
var list = db.From <Student>()
.GroupBy(a => a.Name)
.Having(a => SqlFun.COUNT(1L) > 1)
.OrderByDescending(a => SqlFun.COUNT(1))
.Select(s => new
{
s.Name,
//Names = SqlFun.GROUP_CONCAT(s.Name),
Count = SqlFun.COUNT(1L),
Balance = SqlFun.SUM(s.Balance)
}).ToList();
}
}
public void TestGroup()
{
var sb = new System.Data.SQLite.SQLiteConnectionStringBuilder();
sb.DataSource = "D:\\sqlite.db3";
var connection = new System.Data.SQLite.SQLiteConnection(sb.ConnectionString);
using (IDbContext db = new DbProxyContext(connection, DbContextType.Sqlite))
{
db.Open();
var list = db.From <Student>()
.GroupBy(a => a.Name)
.Having(a => SqlFun.COUNT(1L) > 1)
.OrderByDescending(a => SqlFun.COUNT(1))
.Select(s => new
{
s.Name,
Names = SqlFun.GROUP_CONCAT(s.Name),
Count = SqlFun.COUNT(1L),
Balance = SqlFun.SUM(s.Balance)
}).ToList();
}
}
public void TestPage()
{
var connection = new Npgsql.NpgsqlConnection("Server=127.0.0.1;Port=5432;User Id=postgres;Password=1024;Database=test;");
using (IDbContext db = new DbProxyContext(connection, DbContextType.Postgresql))
{
db.Open();
//第一种方式
var list1 = db.From <Student>().Page(1, 2, out long total1).Select().ToList();
var list2 = db.From <Student>().Page(2, 2, out long total2).Select().ToList();
//第二种方式
var id = 24;
var(list3, total3) = db.From <Student>().Where(a => a.Id > id).Page(1, 2).SelectMany();
var(list4, total4) = db.From <Student>().Where(a => a.Id > id).Page(2, 2).SelectMany();
//分组分页
var(glist1, gtotal1) = db.From <Student>().GroupBy(a => a.Name).Page(1, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
var(glist2, gtotal2) = db.From <Student>().GroupBy(a => a.Name).Page(2, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
}
}
public void TestPage()
{
var connection = new MySql.Data.MySqlClient.MySqlConnection("server=localhost;user id=root;password=1024;database=test;");
using (IDbContext db = new DbProxyContext(connection, DbContextType.Mysql))
{
db.Open();
//第一种方式
var list1 = db.From <Student>().Page(1, 2, out long total1).Select().ToList();
var list2 = db.From <Student>().Page(2, 2, out long total2).Select().ToList();
//第二种方式
var id = 24;
var(list3, total3) = db.From <Student>().Where(a => a.Id > id).Page(1, 2).SelectMany();
var(list4, total4) = db.From <Student>().Where(a => a.Id > id).Page(2, 2).SelectMany();
//分组分页
var(glist1, gtotal1) = db.From <Student>().GroupBy(a => a.Name).Page(1, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
var(glist2, gtotal2) = db.From <Student>().GroupBy(a => a.Name).Page(2, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
}
}
public void TestPage()
{
var connection = new System.Data.SqlClient.SqlConnection(@"Data Source=DESKTOP-9IS2HA6\SQLEXPRESS;Initial Catalog=test;Persist Security Info=True;User ID=sa;Password=1024");
using (IDbContext db = new DbProxyContext(connection, DbContextType.SqlServer))
{
db.Open();
//第一种方式
var list1 = db.From <Student>().Page(1, 2, out long total1).Select().ToList();
var list2 = db.From <Student>().Page(2, 2, out long total2).Select().ToList();
//第二种方式，只分页不计数的可以通过skip实现
var id = 24;
var(list3, total3) = db.From <Student>().Where(a => a.Id > id).Page(1, 2).SelectMany();
var(list4, total4) = db.From <Student>().Where(a => a.Id > id).Page(2, 2).SelectMany();
//分组分页
var(glist1, gtotal1) = db.From <Student>().GroupBy(a => a.Name).Page(1, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
var(glist2, gtotal2) = db.From <Student>().GroupBy(a => a.Name).Page(2, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
}
}
public void TestPage()
{
var sb = new System.Data.SQLite.SQLiteConnectionStringBuilder();
sb.DataSource = "D:\\sqlite.db3";
var connection = new System.Data.SQLite.SQLiteConnection(sb.ConnectionString);
using (IDbContext db = new DbProxyContext(connection, DbContextType.Sqlite))
{
db.Open();
//第一种方式
var list1 = db.From <Student>().Page(1, 2, out long total1).Select().ToList();
var list2 = db.From <Student>().Page(2, 2, out long total2).Select().ToList();
//第二种方式
var id = 24;
var(list3, total3) = db.From <Student>().Where(a => a.Id > id).Page(1, 2).SelectMany();
var(list4, total4) = db.From <Student>().Where(a => a.Id > id).Page(2, 2).SelectMany();
//分组分页
var(glist1, gtotal1) = db.From <Student>().GroupBy(a => a.Name).Page(1, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
var(glist2, gtotal2) = db.From <Student>().GroupBy(a => a.Name).Page(2, 2).SelectMany(s => new { s.Name, Count = SqlFun.COUNT(1L) });
}
}
