在java转C#WPF上位机，MVVM过程中，遇到数据库的问题，经过简单的学习FreeSql语法糖，进行一下简单的封装及使用。
- 我们在C#项目中实现FreeSql技术，首先在我们需要在使用语法糖所在的文件下点击依懒性>管理NuGet程序包，搜索FreeSql并进行下载：
- 在appsettings.json配置文件中输入数据库连接配置，如果没有可在文件夹下自行创建，这里的连接的数据库是MYSQL和SQLServer的，不同的数据库连接的内容不一样。
{
"ConnectionStrings": {
"mysql": "server=127.0.0.1;uid=root;pwd=admin;database=localtool;pooling=true;connectionlifetime=5;minpoolsize=1;maxpoolsize=500;"
"Server Sql" = "localhost; Database = Session1; uid = sa; pwd = qwer; Trusted_Connection = False;"
}
}
进行FreeSql的封装，注意文件名，我这边是复制的代码。
-
在我们下载FreeSql的文件夹下创建Database文件夹；
-
在Database文件夹下创建IFreeSqlDatabase.cs文件。
namespace XiaoDao.Database
{
public interface IFreeSqlDatabase
{
IFreeSql FreeSql {
get; }
}
}
- 在Database文件下在创建FreeSqlDatabase.cs文件
namespace XiaoDao.Database
{
public class FreeSqlDatabase : IFreeSqlDatabase
{
private IFreeSql freeSql;
public FreeSqlDatabase(string connectionString) {
freeSql = new FreeSqlBuilder().UseConnectionString(DataType.MySql, connectionString)
.UseMonitorCommand(cmd => Console.WriteLine($"sql:{cmd.CommandText}")).UseAutoSyncStructure(true).Build();
}
public IFreeSql FreeSql => freeSql;
}
}
- 在创建与Database文件夹统计的interfaces和services文件夹
- 在interfaces创建IBaseDataService.cs文件
namespace XiaoDao.Database.interfaces
{
public interface IBaseDataService<T>
{
IEnumerable<T> GetAll();
T Get(long id);
T Get(string code);
T Create(T entity);
T Update(long id, T entity);
T Update(string code, T entity);
bool Delete(long id);
bool Delete(string code);
bool Delete(T entity);
}
}
- 创建services文件夹下创建dataService.cs文件
namespace XiaoDao.Database.services
{
public class DataService<T> : IBaseDataService<T> where T : DomainObject
{
private readonly IFreeSqlDatabase database;
public DataService(IFreeSqlDatabase database){
this.database = database;
}
public virtual T Create(T entity)
{
if (entity.Id == 0) {
entity.Id = Snowflake.Instance().GetId();
}
entity.CreatedAt = DateTime.Now;
entity.UpdatedAt = DateTime.Now;
database.FreeSql.Insert(entity).ExecuteAffrows();
return entity;
}
public virtual bool Delete(long id)
{
database.FreeSql.Delete<T>(new[] {
id}).ExecuteAffrows();
return true;
}
public virtual bool Delete(string code)
{
database.FreeSql.Delete<T>(new[] {
code }).ExecuteAffrows();
return true;
}
public virtual bool Delete(T entity)
{
database.FreeSql.Delete<T>(new[] {
entity.Id }).ExecuteAffrows();
return true;
}
public virtual T Get(long id)
{
return database.FreeSql.Select<T>().Where(a => a.Id == id).ToOne();
}
public virtual T Get(string code)
{
return database.FreeSql.Select<T>().Where(a => a.Code == code).ToOne();
}
public virtual IEnumerable<T> GetAll()
{
return database.FreeSql.Select<T>().OrderByDescending(o => o.Id).ToList();
}
public virtual T Update(long id, T entity)
{
Debug.WriteLine(database.FreeSql.Update<T>().SetSource(entity).ToSql());
database.FreeSql.Update<T>().SetSource(entity).ExecuteAffrows();
return entity;
}
public virtual T Update(string code, T entity)
{
Debug.WriteLine(database.FreeSql.Update<T>().SetSource(entity).ToSql());
database.FreeSql.Update<T>().SetSource(entity).ExecuteAffrows();
return entity;
}
}
}
在interfaces和services文件夹我们实现了对一些接口的封装，当然我们可以根据实体类自行定义接口进行继承此封装的接口。
接下来我们介绍一下如何在C#的WPF项目中MVVM模式下进行FreeSql操作。
我们需要根据数据库内容，创建实体类（model）、接口（interfaces）、和接口实现方法（services）。下面那我的举例，需要根据自己的进行修改。
- model类（注意与数据库中的字段对上，代码有所删减）
namespace XiaoDao.Domain.Models
{
public class OperationData
{
[Column(IsPrimary = true)]
public long Id {
get; set; }
public string Code {
get; set; }
[JsonIgnore]
public DateTime? CreatedAt {
get; set; }
[JsonIgnore]
public DateTime? UpdatedAt {
get; set; }
[JsonIgnore]
public DateTime? DeletedAt {
get; set; }
[JsonIgnore]
public string CreatedBy {
get; set; }
[JsonIgnore]
public string UpdatedBy {
get; set; }
[JsonIgnore]
public string DeleteedBy {
get; set; }
private int complteBolts;
private int errorBolts;
private int currentOperationBoltId;
private int actionBolts;
private string complteBoltCode;
private string asyncStatus = "未同步";
private int _index;
public int getIndex()
{
return _index; }
public void setIndex(int index) {
_index = index; }
}
}
- 接口 这里继承了上面进行封装的类
namespace XiaoDao.Database.interfaces
{
public interface IOperationDataDataService : IBaseDataService<OperationData>
{
IEnumerable<OperationData> GetPagedOperations(int pageIndex, int pageSize, out int pageCout);
IEnumerable<OperationData> GetPageOpeartionsByType(int pageIndex, int pageSize, string operationByType, out int pageCount);
OperationData GetLastestRecord();
IEnumerable<OperationData> GetPageOperationsByProcess(int pageIndex, int pageSize, string processNo, out int pageCount);
IEnumerable<OperationData> GetPageOperationsByProject(int pageIndex, int pageSize, string projectNo, string processNo, int machineNo, out int pageCount);
long GetDataStatus();
long GetDataStatusTreat();
}
}
- 接口实现
namespace XiaoDao.Database.services
{
public class OperationDataDataService : DataService<OperationData>, IOperationDataDataService
{
private readonly IFreeSqlDatabase database;
public OperationDataDataService(IFreeSqlDatabase database):base(database)
{
this.database = database;
}
public long GetDataStatus()
{
return database.FreeSql.Select<OperationData>().Where(p => p.AsyncStatus == "同步中").Count();
}
public long GetDataStatusTreat()
{
return database.FreeSql.Select<OperationData>().Where(p => p.AsyncStatus == "待同步").Count();
}
public OperationData GetLastestRecord()
{
var item = database.FreeSql.Select<OperationData>().OrderByDescending(d => d.CreatedAt).ToOne();
return item == null ? new OperationData() : item;
}
public IEnumerable<OperationData> GetPagedOperations(int pageIndex, int pageSize, out int pageCout)
{
long total = 0;
var items = database.FreeSql.Select<OperationData>().OrderByDescending(d => d.StartDate).Count(out total).Page(pageIndex, pageSize).ToList();
pageCout = int.Parse(total.ToString()) / pageSize + 1;
return items;
}
public IEnumerable<OperationData> GetPageOpeartionsByType(int pageIndex, int pageSize, string operationByType, out int pageCount)
{
long total = 0;
var items = database.FreeSql.Select<OperationData>().Where(p => (p.OperationByType == operationByType) && (p.ComplteBolts > 0)).Count(out total).OrderByDescending(p => p.StartDate).Page(pageIndex, pageSize).ToList();
pageCount = int.Parse(total.ToString()) / pageSize + 1;
return items;
}
public IEnumerable<OperationData> GetPageOperationsByProcess(int pageIndex, int pageSize, string processNo, out int pageCount)
{
long total = 0;
var items = database.FreeSql.Select<OperationData>().Where(p => p.ProjectMachoneNo == 0 && p.ProductionProcessNo == processNo).OrderByDescending(p => p.UpdatedAt).Count(out total).Page(pageIndex, pageSize).ToList();
pageCount = int.Parse(total.ToString()) / pageSize + 1;
return items;
}
public IEnumerable<OperationData> GetPageOperationsByProject(int pageIndex, int pageSize, string projectNo, string processNo, int machineNo, out int pageCount)
{
long total = 0;
var query = database.FreeSql.Select<OperationData>().Where(p => p.ProductionProjectNo == projectNo);
if (!string.IsNullOrEmpty(processNo))
{
query.Where(p => p.ProductionProcessNo == processNo);
}
if(machineNo > 0)
{
query = query.Where(p => p.ProjectMachoneNo == machineNo);
}
var item = query.OrderByDescending(p => p.UpdatedAt).Page(pageIndex, pageSize).ToList();
pageCount = int.Parse(total.ToString()) / pageSize + 1;
return item;
}
}
}
现在我们的接口和sql已经完毕，下面就到我们的MVVM进行调用。
在我们的所需要使用FreeSql的ViewMode文件里写上
private readonly IOperationDataDataService _operationDataDataService;
- 在VIewModel的主方法里写上引用。
方法参数里写上 IOperationDataDataService operationDataDataService,
方法里进行引用 _operationDataDataService = operationDataDataService;
这时我们就可以使用FreeSql
注意我们接口里的参数。到此我们这篇文章结束。
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