Fetch the repository succeeded.
easy4net是一个轻量级orm框架，灵活在于可以自己编写复杂的SQL语句查询，简单在于几分钟内便能上手使用，并支持mysql, mssql, oracle, access, sqlite数据库. easy4net技术QQ 群：162695864
分页查询：
int pageIndex = 1;
int pageSize = 3;
string strSql = "SELECT e.*, c.company_name FROM employee e INNER JOIN company c ON e.company_id = c.id WHERE e.name = @name";
ParamMap param = ParamMap.newMap();
param.setPageParamters(page, limit);
//分页时使用的排序字段，必填，请带上SQL表名的别名，如employee的为: e
param.setOrderFields("e.id", true);
param.setParameter("name", "LiYang");
//MySQLString是app.config或web.config中配置的连接数据库字符串，
//应部分用户需要可以切换多个数据库要求
Session session = SessionFactory.GetSession("MySQLString");
List<Employee> emList = session.Find<Employee>(strSql, param);
分页查询：
public PageResult<Store> findByPage(int page, int limit)
{
Session session = SessionFactory.GetSession("MySQLString");
String sql = "select * from store";
ParamMap param = ParamMap.newMap();
param.setPageParamters(page, limit);
param.setOrderFields("id", true);
PageResult<Store> pageResult = session.FindPage<Store>(sql, param);
return pageResult;
}
public class PageResult<T>
{
/// <summary>
/// 分页查询中总记录数
/// </summary>
public int Total {get; set;}
/// <summary>
/// 分页查询中结果集合
/// </summary>
public List<T> DataList {get; set;}
}
查询单条记录：
string strSql = "SELECT e.*, c.company_name FROM employee e INNER JOIN company c ON e.company_id = c.id WHERE e.name = @name";
ParamMap param = ParamMap.newMap();
param.setParameter("name", "LiYang");
Employee em = session.Get<Employee>(strSql, param);
普通查询：
string strSql = "SELECT e.*, c.company_name FROM employee e INNER JOIN company c ON e.company_id = c.id";
List<Employee> emList = session.Find<Employee>(strSql);
新增：
//创建公司
Company company = new Company();
company.CompanyName = txtName.Text.Trim();
company.Industry = txtIndustry.Text.Trim();
company.Address = txtAddress.Text.Trim();
Session session = SessionFactory.GetSession("MySQLString");
session.Insert<Company>(company);
if (company.Id > 0) {
MessageBox.Show("创建公司成功！");
}
//新增员工
Company company = m_CompanyList[cbCompany.SelectedIndex];
Employee employee = new Employee();
employee.Name = txtName.Text.Trim();
mployee.Age = Convert.ToInt32(txtAge.Text.Trim());
employee.Address = txtAddress.Text.Trim();
employee.Created = DateTime.Now;
employee.CompanyId = company.Id;
Session session = SessionFactory.GetSession("MySQLString");
session.Insert<Employee>(employee);
if (employee.Id > 0)
{
MessageBox.Show("新增员工成功！");
}
批量新增：
List<Company> companyList = ...;
Session session = SessionFactory.GetSession("MySQLString");
session.Insert(companyList);
修改：
Company entity = new Company();
entity.Id = 1;
entity.Name = "百度";
Session session = SessionFactory.GetSession("MySQLString");
session.Update(entity);
批量修改：
Session session = SessionFactory.GetSession("MySQLString");
List<Company> companyList = ...;
Session session = SessionFactory.GetSession("MySQLString");
session.Update(companyList);
删除：
Company company = m_companyList[i];
//remove a object
Session session = SessionFactory.GetSession("MySQLString");
session.Delete(company);
//remove by id
session.Delete(company.Id);
批量删除：
//remove by object
List<Company> companyList = ...;
Session session = SessionFactory.GetSession("MySQLString");
session.Delete(companyList);
//remove by id
object[] ids = new object[]{1,2,3,4,5};
session.Delete(ids);
数据库与C#对象映射关系配置：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Easy4net.Entity
{
[Table(Name = "company")]
public class Company
{
[Id(Name = "id", Strategy = GenerationType.INDENTITY)]
public int? Id{ get; set; }
[Column(Name = "company_name")]
public String CompanyName{ get; set; }
[Column(Name = "industry")]
public String Industry { get; set; }
[Column(Name = "address")]
public String Address { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text;
namespace Easy4net.Entity
{
[Table(Name = "employee")]
public class Employee
{
[Id(Name = "id", Strategy = GenerationType.INDENTITY)]
public int? Id{ get; set; }
[Column(Name = "name")]
public String Name{ get; set; }
[Column(Name = "age")]
public int? Age{ get; set; }
[Column(Name = "address")]
public String Address{ get; set; }
[Column(Name = "created")]
public DateTime? Created{ get; set; }
[Column(Name = "company_id")]
public int? CompanyId{ get; set; }
[Column(Name = "company_name", IsInsert = false, IsUpdate = false)]
public String CompanyName { get; set; }
}
}
数据库连接配置 web.config中：
<?xml version="1.0"?>
<configuration>
<connectionStrings>
<add name="MySQLString"
connectionString="Data Source=localhost;Initial Catalog=test_db;Persist Security Info=True;User ID=root;Password=123456;Min Pool Size=1;Max Pool Size=3;"
providerName="MySql.Data.MySqlClient" />
<add name="SqlServerString"
connectionString="Data Source=(local);Initial Catalog=Study;User ID=sa;Password=sa;"
providerName="System.Data.SqlClient" />
<add name="OracleString"
connectionString="Data Source=192.168.0.2;Initial Catalog=test;Persist Security Info=True;User ID=user1;Password=pass1"
providerName="System.Data.OracleClient" />
<add name="SQLiteString" connectionString="Data Source=|DataDirectory|\testdb.sqlite;Pooling=true;"
providerName="System.Data.SQLite" />
</connectionStrings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>
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