The "sqlsugar" component implements data access
SqlSugar is a small and full-featured ORM that does not need to rely on third-party extensions like Dapper. The syntax is easy to use and simple, with beautiful lambda syntax, and also supports Dapper SQL and ADO.NET (stored procedures, etc.). All functions, its performance reaches the native level, far surpassing Dapper and EF CORE, and supports .NET CORE, multiple databases
1. 连接数据库
1)添加一个数据表的类定义其属性
class Customer
{
public string customerNo
{
get;
set;
}
public string customerName
{
get;
set;
}
public string zip
{
get;
set;
}
public string address
{
get;
set;
}
public string telephone
{
get;
set;
}
}2) Add another class to connect to the database
public class SugarDao
{
public static string ConnectionString
{
get
{
string reval = "Data Source=.;Integrated Security=SSPI;Initial Catalog=OrderDB";
return reval;
}
}
public static SqlSugarClient GetInstance()
{
var db = new SqlSugarClient(ConnectionString);
return db;
}
}
3) Main function part
var db = SugarDao.GetInstance(); 2. 查询
1) Query a single
var single = db.Queryable<Customer>().Single(c => c.customerNo == "C20050002");
Console.WriteLine("{0} {1} {2} {3} {4}", single.customerNo, single.customerName, single.address, single.telephone, single.zip);2) Query a single item according to the primary key
var singleByPk = db.Queryable<Customer().InSingle("C20050001");
Console.WriteLine("{0} {1} {2} {3} {4}", singleByPk.customerNo, singleByPk.customerName, singleByPk.address, singleByPk.telephone, singleByPk.zip);3) Query all customerNo
var singleFieldList = db.Queryable<Customer>().Select<string>(it => it.customerNo).ToList();
foreach (var item in singleFieldList)
{
Console.WriteLine(item);
}4) Query multiple items
List<Customer> cusList = db.Queryable<Customer>().ToList();
foreach (Customer i in cusList)
{
Console.WriteLine("{0} {1} {2} {3} {4}", i.customerNo, i.customerName, i.address, i.telephone, i.zip);
}
5) Fuzzy query
Console.WriteLine("查询客户名称中包含'市'的");
var c1 = db.Queryable<Customer>().Where(c => c.customerName.Contains("市")).ToList();
foreach (Customer i in c1)
{
Console.WriteLine("{0} {1} {2} {3} {4}", i.customerNo, i.customerName, i.address, i.telephone, i.zip);
}
Console.WriteLine("查询客户名称是'南'字开头的");
var c2 = db.Queryable<Customer>().Where(c => c.customerName.StartsWith("南")).ToList();
foreach (Customer i in c2)
{
Console.WriteLine("{0} {1} {2} {3} {4}", i.customerNo, i.customerName, i.address, i.telephone, i.zip);
}
Console.WriteLine("查询客户名称是'城'字结尾的");
var c3 = db.Queryable<Customer>().Where(c => c.customerName.EndsWith("城")).ToList();
foreach (Customer i in c3)
{
Console.WriteLine("{0} {1} {2} {3} {4}", i.customerNo, i.customerName, i.address, i.telephone, i.zip);
} 3. 插入
1) The column of attribute zip will not insert values
db.DisableInsertColumns = new string[] { "zip" };2) Add a column that prohibits inserting
db.AddDisableInsertColumns("telephone", "address");//如果插入的列本身为not null，那么数据将无法插入到数据库Customer cus = new Customer()
{
customerNo = "C20080002",
customerName = "南昌市电脑研制中心",
telephone = "215455452",
address = "南昌市",
zip = "000222"
};
Customer cus1 = new Customer()
{
customerNo = "C20080003",
customerName = "南昌市电脑研制中心",
telephone = "215455333",
address = "南昌市",
zip = "222555"
};3) Insert a single
var id = db.Insert(cus); 4) Insert multiple
List<Customer> clist = new List<Customer>();
clist.Add(cus);
clist.Add(cus1);5) Bulk insert
var id1 = db.InsertRange(clist);6) Batch insertion is suitable for mass data insertion
var id2 = db.SqlBulkCopy(clist);7) Clear the forbidden insert column
db.DisableInsertColumns = null; 4. 更新
1) Only update the attribute zip with the condition customerNo == "C20050001"
db.Update<Customer>(new { zip = "111000" }, it => it.customerNo == "C20050001");2) Update two columns of attribute zip and attribute telephone
db.Update<Customer, string>(new { zip = "112311", telephone = "012-45781411" }, "C20050001", "C20050002");//根据主键,可以有多个参数，结果修改后的多个人的zip，telephone都相同3) use dictionary update
var dic = new Dictionary<string, string>();
dic.Add("zip", "112333");
dic.Add("telephone", "012-45781433");
db.Update<Customer, string>(dic, "C20050001");4) The whole entity is updated
Method 1:
db.Update(new Customer { customerNo = "C20050001", customerName = "蓝翔16", zip = "112311", address = "北京市", telephone = "012-45781411" });Method Two
db.Update<Customer>(new Customer { customerName = "蓝翔14", zip = "112333", address = "上海市", telephone = "012-45781422" }, it => it.customerNo == "C20050001");Notice:
db.Update<Customer>(new Customer() { customerNo = "C20050001", customerName = "蓝翔16" });//这里只更新某几列是可以实现的，未添加值的列将为null，所以若属性设置为了not null会更新失败5) Set the column not to update
db.DisableUpdateColumns = new string[] { "telephone" };//设置telephone不更新 Customer cus = new Customer()
{
customerNo = "C20050001",
customerName = "南昌市电脑研制中心",
address = "南昌市",
zip = "000222"
};
Customer cus1 = new Customer()
{
customerNo = "C20050002",
customerName = "南昌市电脑研制中心",
address = "上海市",
zip = "222000"
};6) Update a single
var id = db.Update(cus); 7) Update multiple items
List<Customer> clist = new List<Customer>();
clist.Add(cus);
clist.Add(cus1);8) Batch update
Method 1:
var id1 = db.UpdateRange(clist);Method Two:
var id2 = db.SqlBulkReplace(clist);// 适合海量数据更新9) Clear the forbidden update column
db.DisableUpdateColumns = null;5. 删除
1) According to the primary key
db.Delete<Customer, string>("C20080002");2) Primary key batch deletion
db.Delete<Customer, string>(new string[] {"C20080002", "C20080003" });3) Batch deletion of non-primary keys
db.Delete<Customer, string>(it => it.address, new string[] { "000222", "222000" });4) Delete according to the string
db.Delete<Customer>(it => it.customerNo == "C20080002");5) According to the expression
db.Delete<Customer>("customerNo=@customerNo", new { customerNo = "C20080002" });
6) According to the entity
db.Delete(new Customer() { customerNo = "C20080003" });