轻量级orm框架-easy4net

easy4net

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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数据库. easy4net技术QQ 群：162695864

分页查询：

• 1. 命名参数， ParamMap传参方式：
• 2. 支持多层嵌套查询自动分页功能。

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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: eparam.setOrderFields("e.id", true);param.setParameter("name", "LiYang");DBHelper dbHelper = DBHelper.getInstance();List<Employee> emList = dbHelper.Find<Employee>(strSql, param);

分页查询：

• 1. 命名参数， ParamMap传参方式：
• 2. 返回总条数和数据集合的对象PageResult

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public PageResult<Store> findByPage(int page, int limit){    DBHelper db = DBHelper.getInstance();    String sql = "select * from store";    ParamMap param = ParamMap.newMap();    param.setPageParamters(page, limit);    param.setOrderFields("id", true);    PageResult<Store> pageResult = db.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：

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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 = dbHelper.FindOne<Employee>(strSql, param);

普通查询：

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string strSql = "SELECT e.*, c.company_name FROM employee e INNER JOIN company c ON e.company_id = c.id";List<Employee> emList = dbHelper.Find<Employee>(strSql);

新增：

• 1. 新增后返回新增记录的主键id值
• 2. 主键id值已经自动填充到新增的对象entity中

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//创建公司Company company = new Company();company.CompanyName = txtName.Text.Trim();company.Industry = txtIndustry.Text.Trim();company.Address = txtAddress.Text.Trim();DBHelper dbHelper = DBHelper.getInstance();dbHelper.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;DBHelper dbHelper = DBHelper.getInstance();dbHelper.Insert<Employee>(employee);if (employee.Id > 0){    MessageBox.Show("新增员工成功！");}

批量新增：

• 1. 主键id值已经自动填充到新增的对象entity中
• 2. 批量新增方法比手动循环多个对象然后调用新增性能高。

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List<Company> companyList = ...;dbHelper.Insert(companyList);

修改：

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Company entity = new Company();entity.Id = 1;entity.Name = "百度";dbHelper.Update(entity);

批量修改：

• 1. 批量修改方法比手动循环多个对象然后调用修改性能高。

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DBHelper db = DBHelper.getInstance();List<Company> companyList = ...;dbHelper.Update(companyList);

删除：

• 1. 按对象方式删除数据
• 2. 按主键id方式删除数据

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Company company = m_companyList[i];//remove a objectdbHelper.Delete(company);//remove by iddbHelper.Delete(company.Id);

批量删除：

• 1. 按对象方式删除数据
• 2. 按主键id方式删除数据
• 3. 批量删除比手动循环调用删除性能要高

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//remove by objectList<Company> companyList = ...;dbHelper.Delete(companyList);//remove by idobject[] ids = new object[]{1,2,3,4,5};dbHelper.Delete(ids);

数据库与C#对象映射关系配置：

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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： *

• dbType中配置sqlserver, mysql, oracle来支持不同的数据库

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<?xml version="1.0"?><configuration>  <appSettings>    <!--<add key="DbType" value="sqlserver"/>    <add key="connectionString" value="Data Source=121.199.9.217;Initial Catalog=test;User ID=test;Password=test123;Trusted_Connection=no;Min Pool Size=10;Max Pool Size=100;"/>-->    <!--<add key="DbType" value="mysql"/>    <add key="connectionString" value="Data Source=121.199.34.41;port=8001;User ID=test;Password=123456;DataBase=test;Min Pool Size=10;Max Pool Size=100;"/>-->    <!--<add key="DbType" value="access"/>    <add key="connectionString" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\tj.mdb"/>-->    <!--<add key="DbType" value="sqlserver"/>    <add key="DbHost" value="8QHMQCAJBCOOHW2\SQLEXPRESS" />    <add key="DbName" value="test"/>    <add key="DbUser" value="sa"/>    <add key="DbPassword" value="111111"/>    <add key="DbMinPoolSize" value="10"/>    <add key="DbMaxPoolSize" value="100"/>-->    <add key="DbType" value="mysql"/>    <add key="DbHost" value="localhost" />    <add key="DbName" value="test_db"/>    <add key="DbUser" value="user_test"/>    <add key="DbPassword" value="111111"/>    <add key="DbPort" value="3306"/>    <add key="DbMinPoolSize" value="10"/>    <add key="DbMaxPoolSize" value="100"/>  </appSettings><startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>