资料
- DLL链接：https://pan.baidu.com/s/1JEvBu1kCqVc1vN49uuYEAw 提取码：frv5
MySQLHelper
- 一定要提前设置一下数据库类型（SetDBType()），否则某些dapper的扩展方法或sql语句会报语法错误
- dapper默认是sqlserver
- SetDBType()只需在所有数据库操作之前执行一次即可
using System;
using System.Data;
using Dapper;
using MySql.Data.MySqlClient;
using MS.Base;
namespace MS.DBUtil
{
public class MySQLHelper
{
private static readonly string connString = System.Configuration.ConfigurationManager.ConnectionStrings["connString"].ToString();
private static void SetDBType()
{
Dapper.SimpleCRUD.SetDialect(Dapper.SimpleCRUD.Dialect.MySQL);
}
static MySQLHelper()
{
SetDBType();
}
public static IDbConnection Conn
{
get
{
return new MySqlConnection(connString);
}
}
}
}
实体类
- Key、Column等特性需要添加Dapper.SimpleCRUD的静态引用
- 通过Table、Column来将实体类与数据库不对应的字段对应起来，Key标识主键
- 扩展属性通过NotMapped, IgnoreInsert, IgnoreSelect, IgnoreUpdate来标识忽略，const字段自动忽略
using Dapper;
namespace MS.Models
{
[Serializable]
[Table("ms_employee")]
public class EmployeeModel
{
[Key]
[Column("Id")]
public string Id { get; set; }
[Column("DepartmentId")]
public string DepartmentId { get; set; }
[IgnoreInsert,IgnoreSelect,IgnoreUpdate]
public string DepartmentName { get; set; }
[Column("EmployeeNo")]
public string EmployeeNo { get; set; }
[Column("EmployeeName")]
public string EmployeeName { get; set; }
[Column("EmployeeSex")]
public string EmployeeSex { get; set; }
private string _employeeBirth = string.Empty;
[Column("EmployeeBirth")]
public string EmployeeBirth
{
get
{
return this._employeeBirth;
}
set
{
this._employeeBirth = Convert.ToDateTime(value).ToString("yyyy-MM-dd");
}
}
[Column("IsJob")]
public bool IsJob { get; set; }
[Column("Remarks")]
public string Remarks { get; set; }
[NotMapped, IgnoreInsert, IgnoreSelect, IgnoreUpdate]
public DepartmentModel CorrespondingDepartment { get; set; }
}
}
using Dapper;
namespace MS.Models
{
[Serializable]
[Table("ms_department")]
public class DepartmentModel
{
[Key]
[Column("Id")]
public string Id { get; set; }
[Column("DepartmentNo")]
public string DepartmentNo { get; set; }
[Column("DepartmentName")]
public string DepartmentName { get; set; }
[Column("Remarks")]
public string Remarks { get; set; }
}
}
DAL
- 使用Get、GetList、Update等方法前，一定要正确设置数据库类型
增
public int AddEmployee(EmployeeModel employee)
{
StringBuilder sql = new StringBuilder("INSERT INTO ms_employee(Id,DepartmentId,EmployeeNo,EmployeeName,EmployeeSex,EmployeeBirth,IsJob,Remarks)");
sql.Append(" VALUES(@Id,@DepartmentId,@EmployeeNo,@EmployeeName,@EmployeeSex,@EmployeeBirth,@IsJob,@Remarks);");
int add_Result = 0;
try
{
using (this.Conn)
{
add_Result = this.Conn.Execute(sql.ToString(), employee);
}
}
catch (Exception ex)
{
log.Error(ex);
}
return add_Result;
}
删
///
/// 根据Id（主键），删除员工
///
///
///
public int DeleteEmployeeById(string id)
{
int delete_Result = 0;
EmployeeModel model = new EmployeeModel();
model.Id = id;
try
{
using (this.Conn)
{
delete_Result = this.Conn.Delete(model);
}
}
catch (Exception ex)
{
log.Error(ex);
}
return delete_Result;
}
public int DeleteEmployeeByNo(string employeeNo)
{
int delete_Result = 0;
string sql = "DELETE FROM ms_employee WHERE EmployeeNo=@EmployeeNo;";
try
{
using (this.Conn)
{
delete_Result = this.Conn.Execute(sql, new { EmployeeNo = employeeNo });
}
}
catch (Exception ex)
{
log.Error(ex);
}
return delete_Result;
}
改
public int ModfiyEmployeeInfo(EmployeeModel employee)
{
int modify_Result = 0;
try
{
using (this.Conn)
{
modify_Result = this.Conn.Update(employee);
}
}
catch (Exception ex)
{
log.Error(ex);
}
return modify_Result;
}
查
单表查询
///
/// 根据主键Id获取指定部门
///
///
///
public DepartmentModel GetSpecifyDepartmentById(string id)
{
DepartmentModel model = null;
try
{
using (this.Conn)
{
model = this.Conn.Get(id);
}
}
catch (Exception ex)
{
log.Error(ex);
}
return model;
}
///
/// 根据部门编号（唯一键），获取部门
///
///
///
public DepartmentModel GetSpecifyDepartmentByDepartmentNo(string no)
{
DepartmentModel model = null;
string sql = "SELECT * FROM ms_department WHERE DepartmentNo = @DepartmentNo;";
try
{
using (this.Conn)
{
model = this.Conn.Query(sql, new { DepartmentNo = no }).SingleOrDefault();
}
}
catch (Exception ex)
{
log.Error(ex);
}
return model;
}
///
/// 获取所有部门信息
///
///
public List GetDepartments()
{
List departments = new List();
try
{
using (this.Conn)
{
departments = this.Conn.GetList().ToList();
}
}
catch (Exception ex)
{
log.Error(ex);
}
return departments;
}
///
/// 查询给定的部门编号是否存在
///
///
/// true：已存在 false：未存在
public bool CheckDepartmentNoIsExist(string departmentNo)
{
bool result = true;
try
{
using (this.Conn)
{
string sql = "SELECT COUNT(*) FROM ms_department WHERE DepartmentNo = @DepartmentNo;";
result = this.Conn.ExecuteScalar(sql, new { DepartmentNo = departmentNo }) > 0;
}
}
catch (Exception ex)
{
log.Error(ex);
throw ex;
}
return result;
}
多表联查
///
/// 获取全部员工
///
///
public List GetEmployees()
{
StringBuilder sql = new StringBuilder("SELECT * FROM ms_employee e");
sql.Append(" INNER JOIN ms_department d");
sql.Append(" ON d.Id = e.DepartmentId;");
List models = new List();
try
{
using (this.Conn)
{
models = this.Conn.Query(sql.ToString(), (employee, dp) =>
{
employee.DepartmentName = dp.DepartmentName;
employee.CorrespondingDepartment = dp;
return employee;
}).ToList();
}
}
catch (Exception ex)
{
log.Error(ex);
}
return models;
}
///
/// 根据员工编号（唯一键），查询员工
///
///
///
public EmployeeModel GetSpecifyEmployeeByEmployeeNo(string employeeNo)
{
StringBuilder sql = new StringBuilder("SELECT");
sql.Append(" e.Id,e.DepartmentId,d.DepartmentName,e.EmployeeNo,e.EmployeeName,e.EmployeeSex,e.EmployeeBirth,e.IsJob,e.Remarks");
sql.Append(" ,d.Id, d.DepartmentNo, d.DepartmentName, d.Remarks");
sql.Append(" FROM ms_employee e");
sql.Append(" INNER JOIN ms_department d ON d.Id = e.DepartmentId");
sql.Append(" WHERE EmployeeNo = @EmployeeNo;");
EmployeeModel model = null;
try
{
using (this.Conn)
{
model = this.Conn.Query(sql.ToString(), (employee, dp) =>
{
employee.CorrespondingDepartment = dp;
return employee;
}, new { EmployeeNo = employeeNo }, splitOn: "Id").SingleOrDefault();
/* splitOn：从查询的字段列表最后向前，到splitOn指定的第一个列名，映射到最后一张表
* 接着到splitOn指定的第二个列名，映射到最后第二张表，以此类推
* splitOn:"列名1，列名2，..."
*/
}
}
catch (Exception ex)
{
log.Error(ex);
}
return model;
}
