42岁大龄程序员的迷茫
我真傻,真的。我单知道雪天是野兽在深山里没有食吃,会到村里来;我不知道春天也会有……
我真傻,真的。我单知道程序员要活到老学到老,年龄大了要失业;我不知道码农（新型农民工）也会有……
上周回老家有点无聊就去小破站看了点视频，是讲Dapr的实践（朝夕教育某讲师的公开课录屏），看完非常之震撼：原来微服务离我那么近！
虽然有失业的风险，但是我还是觉得技术人嘛，养家糊口应该没问题的，压力是有点大，但是“办法总比困难多”。所以其实我也不迷茫......
好长时间没有更新博客了，因为我觉得“Show me the Code!”比较重要，最近用.net 5+Dapper搭建了一个WebAPI的开发框架，今天分享给大伙。
几年前有一篇类似的文章大伙可以回顾一下：一次asp.net core3.1打造webapi开发框架的实践
开始show you the code
实践技术看点
- 1、Swagger管理API说明文档
- 2、JwtBearer token验证
- 3、Swagger UI增加Authentication
- 4、Dapper实现的Repository
- 5、在.net 5下使用Log4net
- 6、与钉钉开放平台交互
项目中使用到的包清单：
<ItemGroup>
<PackageReference Include="Hangfire.AspNetCore" Version="1.7.24" />
<PackageReference Include="Hangfire.HttpJob.Agent" Version="1.4.2" />
<PackageReference Include="Hangfire.HttpJob.Agent.MssqlConsole" Version="1.4.2" />
<PackageReference Include="Hangfire.MemoryStorage" Version="1.7.0" />
<PackageReference Include="Hangfire.SqlServer" Version="1.7.24" />
<PackageReference Include="log4net" Version="2.0.12" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="5.0.9" />
<PackageReference Include="Microsoft.AspNetCore.Authorization" Version="5.0.9" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
<PackageReference Include="Swashbuckle.AspNetCore.Swagger" Version="6.1.5" />
<PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="6.1.5" />
<PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="6.1.5" />
</ItemGroup>
关键代码展示：
1）StartUP
这个只贴图吧，教程大伙都看吐了，司空见惯：
用的是标准的套路熟悉的代码。
#region JWT
services.Configure<TokenManagement>(Configuration.GetSection("tokenManagement"));
var token = Configuration.GetSection("tokenManagement").Get<TokenManagement>();
services.AddAuthentication(x =>
{
x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(x =>
{
x.RequireHttpsMetadata = false;
x.SaveToken = true;
x.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(token.Secret)),
ValidIssuer = token.Issuer,
ValidAudience = token.Audience,
ValidateIssuer = false,
ValidateAudience = false
};
});
#endregion
#region Swagger
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1",
new OpenApiInfo
{
Title = "TSP车载MES接口文档",
Version = "v1",
Contact = new OpenApiContact
{
Email = "tsjg@ts-precision.com",
Name = "MES团队",
Url = new Uri("http://www.ts-precision.com/")
}
});
// 为 Swagger 设置xml文档注释路径
var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
c.IncludeXmlComments(xmlPath);
c.AddSecurityDefinition("Bearer",
new OpenApiSecurityScheme
{
Description = "请输入OAuth接口返回的Token，前置Bearer。示例：Bearer {Roken}",
Name = "Authorization",
In = ParameterLocation.Header,
Type = SecuritySchemeType.ApiKey
});
c.AddSecurityRequirement(new OpenApiSecurityRequirement
{
{
new OpenApiSecurityScheme
{
Reference = new OpenApiReference()
{
Id = "Bearer",
Type = ReferenceType.SecurityScheme
}
}, Array.Empty<string>()
}
});
});
#endregion
#region Hangfire
string HangfireConn = Configuration.GetConnectionString("HangfireDB");
//SqlServer持久性
services.AddHangfire(x => x.UseStorage(new SqlServerStorage(
HangfireConn,
new SqlServerStorageOptions
{
QueuePollInterval = TimeSpan.FromSeconds(15),//- 作业队列轮询间隔。默认值为15秒。
JobExpirationCheckInterval = TimeSpan.FromHours(1),//- 作业到期检查间隔（管理过期记录）。默认值为1小时。
CountersAggregateInterval = TimeSpan.FromMinutes(5),//- 聚合计数器的间隔。默认为5分钟。
PrepareSchemaIfNecessary = true,//- 如果设置为true，则创建数据库表。默认是true。
DashboardJobListLimit = 50000,//- 仪表板作业列表限制。默认值为50000。
TransactionTimeout = TimeSpan.FromMinutes(1),//- 交易超时。默认为1分钟。
}))
);
services.AddHangfireHttpJobAgent();
//Hangfire非持久性
//services.AddHangfire(x => x.UseStorage(new MemoryStorage()));
#endregion
2）Dapper相关：
DynamicQuery实现半自动sql编写：
public static class DynamicQuery
{
public static string GetUpdateQuery(string tableName, dynamic item)
{
PropertyInfo[] props = item.GetType().GetProperties();
string[] columns = props.Select(p => p.Name).ToArray();
List<string> parameters = columns.Select(name => name + "=@" + name).ToList();
return string.Format("UPDATE {0} SET {1} WHERE ID=@ID", tableName, string.Join(",", parameters));
} public static string GetInsertQuery(string tableName, dynamic item)
{
PropertyInfo[] props = item.GetType().GetProperties();
string[] columns = props.Select(p => p.Name).Where(s => s != "ID").ToArray();
return string.Format("INSERT INTO {0} ({1}) OUTPUT inserted.ID VALUES (@{2})",
tableName,string.Join(",", columns),string.Join(",@", columns));
} public static QueryResult GetDynamicQuery<T>(string tableName, Expression<Func<T, bool>> expression)
{
List<QueryParameter> queryProperties = new List<QueryParameter>();
try
{
BinaryExpression body = (BinaryExpression)expression.Body;
WalkTree(body, ExpressionType.Default, ref queryProperties);
}
catch (Exception)
{
WalkTree(expression.Body, ExpressionType.Default, ref queryProperties);
}
IDictionary<string, object> expando = new ExpandoObject();
StringBuilder builder = new StringBuilder();
builder.Append("SELECT * FROM ");
builder.Append($"{tableName} WITH(NOLOCK)");
builder.Append(" WHERE ");
for (int i = 0; i < queryProperties.Count; i++)
{
QueryParameter item = queryProperties[i];
if (!string.IsNullOrEmpty(item.LinkingOperator) && i > 0)
{
builder.Append(string.Format("{0} {1} {2} @{1} ", item.LinkingOperator, item.PropertyName,
item.QueryOperator));
}
else
{
builder.Append(string.Format("{0} {1} @{0} ", item.PropertyName, item.QueryOperator));
}
expando[item.PropertyName] = item.PropertyValue;
}
return new QueryResult(builder.ToString().TrimEnd(), expando);
} private static void WalkTree(Expression body, ExpressionType linkingType,
ref List<QueryParameter> queryProperties)
{
if (body is BinaryExpression)
{
var body2 = body as BinaryExpression;
if (body2.NodeType != ExpressionType.AndAlso && body2.NodeType != ExpressionType.OrElse)
{
string propertyName = GetPropertyName(body2);
object propertyValue = GetPropertyValue(body2.Right);
string opr = GetOperator(body.NodeType);
string link = GetOperator(linkingType);
queryProperties.Add(new QueryParameter(link, propertyName, propertyValue, opr));
}
else
{
WalkTree(body2.Left, body.NodeType, ref queryProperties);
WalkTree(body2.Right, body.NodeType, ref queryProperties);
}
}
if (body is MethodCallExpression)
{
var body2 = body as MethodCallExpression;
string propertyName = body2.Object.ToString().Split(".").LastOrDefault();
object propertyValue = body2.Arguments.FirstOrDefault();
string link = GetOperator(linkingType);
if (body2.Method.Name.Equals("Contains"))
{
string val = propertyValue.ToString().Replace(((char)34).ToString(), "");
if (!val.Contains("%"))
queryProperties.Add(new QueryParameter(link, propertyName, $"%{val}%", "LIKE"));
else
queryProperties.Add(new QueryParameter(link, propertyName, $"{val}", "LIKE"));
}
if (body2.Method.Name.Equals("Equals"))
{
string val = propertyValue.ToString().Replace(((char)34).ToString(), "");
queryProperties.Add(new QueryParameter(link, propertyName, val, "="));
}
}
} private static object GetPropertyValue(Expression source)
{
ConstantExpression constantExpression = source as ConstantExpression;
if (constantExpression != null)
{
return constantExpression.Value;
}
Expression<Func<object>> evalExpr = Expression.Lambda<Func<object>>(Expression.Convert(source, typeof(object)));
Func<object> evalFunc = evalExpr.Compile();
object value = evalFunc();
return value;
} private static string GetPropertyName(BinaryExpression body)
{
string propertyName = body.Left.ToString().Split(new char[] { '.' })[1];
if (body.Left.NodeType == ExpressionType.Convert)
{
// hack to remove the trailing ) when convering.
propertyName = propertyName.Replace(")", string.Empty);
}
return propertyName;
} private static string GetOperator(ExpressionType type)
{
switch (type)
{
case ExpressionType.Equal:
return "="; case ExpressionType.NotEqual:
return "!="; case ExpressionType.LessThan:
return "<"; case ExpressionType.GreaterThan:
return ">"; case ExpressionType.AndAlso:
case ExpressionType.And:
return "AND"; case ExpressionType.Or:
case ExpressionType.OrElse:
return "OR"; case ExpressionType.Default:
return string.Empty; case ExpressionType.GreaterThanOrEqual:
return ">="; case ExpressionType.LessThanOrEqual: return "<="; default:
throw new NotImplementedException();
}
}
}
基于Dapper的DbContext :DapperDbContextBase
public abstract class DapperDbContextBase : IDbContext
{
#region Constructors /// <summary>
/// 构造函数
/// </summary>
/// <param name="connectString">连接字符串</param>
protected DapperDbContextBase(string connectString)
{
ConnectString = connectString;
} #endregion Constructors #region Properties /// <summary>
///获取 是否开启事务提交
/// </summary>
public IDbTransaction CurrentTransaction { get; private set; } #endregion Properties #region Fields /// <summary>
/// 当前数据库连接
/// </summary>
public IDbConnection CurrentConnection =>
TransactionEnabled ? CurrentTransaction.Connection : CreateConnection(); /// <summary>
/// 获取 是否开启事务提交
/// </summary>
public bool TransactionEnabled => CurrentTransaction != null; /// <summary>
/// 连接字符串
/// </summary>
protected readonly string ConnectString; #endregion Fields #region Methods /// <summary>
/// 显式开启数据上下文事务
/// </summary>
/// <param name="isolationLevel">指定连接的事务锁定行为</param>
public void BeginTransaction(IsolationLevel isolationLevel = IsolationLevel.Unspecified)
{
if (!TransactionEnabled) CurrentTransaction = CreateConnection().BeginTransaction(isolationLevel);
} /// <summary>
/// 提交当前上下文的事务更改
/// </summary>
/// <exception cref="DataAccessException">提交数据更新时发生异常：" + msg</exception>
public void Commit()
{
if (TransactionEnabled)
try
{
CurrentTransaction.Commit();
}
catch (Exception ex)
{
if (ex.InnerException?.InnerException is SqlException sqlEx)
{
var msg = DataBaseHelper.GetSqlExceptionMessage(sqlEx.Number);
throw new DataAccessException("提交数据更新时发生异常：" + msg, sqlEx);
} throw;
}
} /// <summary>
/// 创建记录
/// </summary>
/// <param name="entity">需要操作的实体类</param>
/// <returns>操作是否成功</returns>
public bool Create<T>(T entity)
where T : ModelBase
{
return CurrentConnection.Insert(new List<T> { entity }, CurrentTransaction) > 0;
} /// <summary>
///异步创建记录
/// </summary>
/// <param name="entity">需要操作的实体类</param>
/// <returns>操作是否成功</returns>
public async Task<bool> CreateAsync<T>(T entity)
where T : ModelBase
{
var result = await CurrentConnection.InsertAsync(
new List<T>
{
entity
}, CurrentTransaction);
bool b = result > 0;
return b;
} /// <summary>
///创建数据库连接IDbConnection
/// </summary>
/// <returns></returns>
public abstract IDbConnection CreateConnection(); /// <summary>
/// 删除记录
/// </summary>
/// <returns>操作是否成功</returns>
/// <param name="entity">需要操作的实体类.</param>
public bool Delete<T>(T entity)
where T : ModelBase
{
return CurrentConnection.Delete(entity);
}
/// <summary>
/// 异步删除记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public async Task<bool> DeleteAsync<T>(T entity)
where T : ModelBase
{
var result = await CurrentConnection.DeleteAsync(entity);
return result;
}
/// <summary>
///条件判断是否存在
/// </summary>
/// <returns>是否存在</returns>
/// <param name="predicate">判断条件委托</param>
public bool Exist<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var result = CurrentConnection.ExecuteScalar(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
return result != null;
}
/// <summary>
/// 异步判断符合条件的实体是否存在
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public async Task<bool> ExistAsync<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var result = await CurrentConnection.ExecuteScalarAsync(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
return result != null;
} /// <summary>
/// 根据id获取记录
/// </summary>
/// <returns>记录</returns>
/// <param name="id">id.</param>
public T GetByKeyId<T>(object id)
where T : ModelBase
{
return CurrentConnection.Get<T>(id, CurrentTransaction);
}
/// <summary>
/// 异步根据id获取记录
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="id"></param>
/// <returns></returns>
public async Task<T> GetByKeyIdAsync<T>(object id)
where T : ModelBase
{
var result = await CurrentConnection.GetAsync<T>(id, CurrentTransaction);
return result;
} /// <summary>
///条件获取记录集合
/// </summary>
/// <returns>集合</returns>
/// <param name="predicate">筛选条件.</param>
public List<T> GetList<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
return CurrentConnection.Query<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction).ToList();
} /// <summary>
/// 条件获取记录集合(异步)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public async Task<List<T>> GetListAsync<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var result = await CurrentConnection.QueryAsync<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
return result.ToList();
} /// <summary>
///条件获取记录第一条或者默认
/// </summary>
/// <returns>记录</returns>
/// <param name="predicate">筛选条件.</param>
public T GetFirstOrDefault<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
return CurrentConnection.QueryFirstOrDefault<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
} /// <summary>
/// 条件获取记录第一条或者默认(异步)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public async Task<T> GetFirstOrDefaultAsync<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var entity = await CurrentConnection.QueryFirstOrDefaultAsync<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
return entity;
} /// <summary>
/// 条件查询
/// </summary>
/// <returns>IQueryable</returns>
/// <param name="predicate">筛选条件.</param>
public IQueryable<T> Query<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var result = CurrentConnection.Query<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction).ToList();
return result.AsQueryable();
} /// <summary>
/// 条件查询(异步)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public async Task<IQueryable<T>> QueryAsync<T>(Expression<Func<T, bool>> predicate = null)
where T : ModelBase
{
var tableName = GetTableName<T>();
var queryResult = DynamicQuery.GetDynamicQuery(tableName, predicate);
var result = await CurrentConnection.QueryAsync<T>(queryResult.Sql, (object)queryResult.Param, CurrentTransaction);
return result.AsQueryable();
} /// <summary>
///显式回滚事务，仅在显式开启事务后有用
/// </summary>
public void Rollback()
{
if (TransactionEnabled) CurrentTransaction.Rollback();
} /// <summary>
///执行Sql 脚本查询
/// </summary>
/// <param name="sql">Sql语句</param>
/// <param name="parameters">参数</param>
/// <returns>集合</returns>
public IEnumerable<T> SqlQuery<T>(string sql, IDbDataParameter[] parameters)
{
var dataParameters = CreateParameter(parameters);
return CurrentConnection.Query<T>(sql, dataParameters, CurrentTransaction);
} /// <summary>
///执行Sql 脚本查询(异步)
/// </summary>
/// <param name="sql">Sql语句</param>
/// <param name="parameters">参数</param>
/// <returns>集合</returns>
public async Task<IEnumerable<T>> SqlQueryAsync<T>(string sql, IDbDataParameter[] parameters)
{
var dataParameters = CreateParameter(parameters);
var list = await CurrentConnection.QueryAsync<T>(sql, dataParameters, CurrentTransaction);
return list;
} /// <summary>
/// 执行Sql 脚本查询带分页(linq分页)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sql"></param>
/// <param name="parameters"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <returns></returns>
public PagedList<T> SqlQueryAndPagedList<T>(string sql, IDbDataParameter[] parameters, int pageIndex, int pageSize)
{
var dataParameters = CreateParameter(parameters);
var result = CurrentConnection.Query<T>(sql, dataParameters, CurrentTransaction);
return PageHelper.ToPagedList(result.AsQueryable(), pageIndex, pageSize);
} /// <summary>
/// 带分页（服务器端分页）的自定义查询
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sql"></param>
/// <param name="orderField"></param>
/// <param name="pageSize"></param>
/// <param name="pageIndex"></param>
/// <param name="total"></param>
/// <returns></returns>
public IEnumerable<T> SqlQueryPage<T>(string sql, string orderField, int pageSize, int pageIndex, out int total) where T : class, new()
{
int num = (pageIndex - 1) * pageSize;
int num1 = (pageIndex) * pageSize;
orderField = "order by " + orderField;
StringBuilder sb = new StringBuilder();
sb.Append("Select * From (Select ROW_NUMBER() Over (" + orderField + ")");
sb.Append(" As rowNum, * From (" + sql + ") As T ) As N Where rowNum > " + num + " And rowNum <= " + num1 + "");
total = Convert.ToInt32(SqlQuery<int>("Select Count(1) From (" + sql + ") As t", null).FirstOrDefault());
string last_sql = sb.ToString();
var dataQuery = CurrentConnection.Query<T>(last_sql).ToList();
return dataQuery;
} /// <summary>
/// FindObjectBase对象通用查询带分页
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="t"></param>
/// <param name="orderField"></param>
/// <param name="pageSize"></param>
/// <param name="pageIndex"></param>
/// <param name="total"></param>
/// <returns></returns>
public IEnumerable<T> SqlQueryPage<T>(T t, string orderField, int pageSize, int pageIndex, out int total) where T : FindObjectBase, new()
{
string tableName = GetQueryTableName<T>();
StringBuilder sb = new StringBuilder();
sb.Append("SELECT * FROM ");
sb.Append($"{tableName} WITH(NOLOCK) ");
sb.Append(" WHERE 1=1 AND ");
var props = typeof(T).GetProperties().Where(p => !p.Name.StartsWith("Chk_"));
foreach (var prop in props)
{
object obj = prop.GetValue(t, null);
if (obj != null)
{
if (prop.Name.ToUpper().StartsWith("LIKE_"))
{
sb.Append($" {prop.Name.Replace("LIKE_", "")} LIKE {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("GT_"))
{
sb.Append($" {prop.Name.Replace("GT_", "")} > {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("ST_"))
{
sb.Append($" {prop.Name.Replace("ST_", "")} < {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("ST_Eq_"))
{
sb.Append($" {prop.Name.Replace("ST_Eq_", "")} <= {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("GT_Eq_"))
{
sb.Append($" {prop.Name.Replace("GT_Eq_", "")} >= {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("BETWEEN_"))
{
string[] array = obj.ToString().Split("|");
sb.Append($" {prop.Name.Replace("GT_Eq_", "")} BETWEEN {array.FirstOrDefault()} AND {array.LastOrDefault()} AND");
}
else
sb.Append($" {prop.Name}={obj} AND ");
}
}
string sql = sb.ToString().ToUpper().TrimEnd("AND ".ToCharArray());
int num = (pageIndex - 1) * pageSize;
int num1 = (pageIndex) * pageSize;
orderField = "order by " + orderField;
StringBuilder builder = new();
builder.Append("Select * From (Select ROW_NUMBER() Over (" + orderField + ")");
builder.Append(" As rowNum, * From (" + sql + ") As T ) As N Where rowNum > " + num + " And rowNum <= " + num1 + "");
total = Convert.ToInt32(SqlQuery<int>("Select Count(1) From (" + sql + ") As t", null).FirstOrDefault());
string last_sql = builder.ToString();
var dataQuery = CurrentConnection.Query<T>(last_sql).ToList();
return dataQuery;
}
/// <summary>
/// FindObjectBase对象通用查询
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="t"></param>
/// <returns></returns>
public IEnumerable<T> SqlQuery<T>(T t) where T : FindObjectBase, new()
{
string tableName = GetQueryTableName<T>();
StringBuilder builder = new();
builder.Append("SELECT * FROM ");
builder.Append($"{tableName} WITH(NOLOCK) ");
builder.Append(" WHERE 1=1 AND ");
var props = typeof(T).GetProperties();
foreach (var prop in props)
{
object obj = prop.GetValue(t, null);
if (obj != null)
{
builder.Append($" {prop.Name}={obj} AND ");
}
}
string sql = builder.ToString().ToUpper().TrimEnd("AND".ToCharArray());
var dataQuery = CurrentConnection.Query<T>(sql).ToList();
return dataQuery;
} /// <summary>
/// 自定义查询返回DataTable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sql"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public DataTable SqlQueryReturnDataTable<T>(string sql, IDbDataParameter[] parameters)
{
var dataParameters = CreateParameter(parameters);
var list = CurrentConnection.Query<T>(sql, dataParameters, CurrentTransaction).ToList();
return ConvertExtension.ToDataTable(list);
} /// <summary>
/// 带分页（服务器端分页）的自定义查询
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sql"></param>
/// <param name="orderField"></param>
/// <param name="pageSize"></param>
/// <param name="pageIndex"></param>
/// <param name="total"></param>
/// <returns></returns>
public DataTable SqlQueryReturnDataTable<T>(string sql, string orderField, int pageSize, int pageIndex, out int total) where T : class, new()
{
int num = (pageIndex - 1) * pageSize;
int num1 = (pageIndex) * pageSize;
orderField = "order by " + orderField;
StringBuilder sb = new StringBuilder();
sb.Append("Select * From (Select ROW_NUMBER() Over (" + orderField + ")");
sb.Append(" As rowNum, * From (" + sql + ") As T ) As N Where rowNum > " + num + " And rowNum <= " + num1 + "");
total = Convert.ToInt32(SqlQuery<int>("Select Count(1) From (" + sql + ") As t", null).FirstOrDefault());
string last_sql = sb.ToString();
var list = CurrentConnection.Query<T>(last_sql).ToList();
return ConvertExtension.ToDataTable(list);
} /// <summary>
///更新实体类记录
/// </summary>
/// <returns>操作是否成功.</returns>
/// <param name="entity">实体类记录.</param>
public bool Update<T>(T entity)
where T : ModelBase
{
return CurrentConnection.Update(entity, CurrentTransaction);
} /// <summary>
/// 更新实体类记录(异步)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public async Task<bool> UpdateAsync<T>(T entity)
where T : ModelBase
{
return await CurrentConnection.UpdateAsync(entity, CurrentTransaction);
} /// <summary>
/// 构建Sql Parameter
/// </summary>
/// <param name="parameters"></param>
/// <returns></returns>
private DapperParameter CreateParameter(IDbDataParameter[] parameters)
{
if (!(parameters?.Any() ?? false)) return null; var dataParameters = new DapperParameter();
foreach (var parameter in parameters) dataParameters.Add(parameter);
return dataParameters;
} /// <summary>
/// 获取实体的TableName
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
private string GetTableName<T>()
where T : ModelBase
{
var tableCfgInfo = AttributeHelper.Get<T,TableAttribute>();
return tableCfgInfo != null ? tableCfgInfo.Name.Trim() : typeof(T).Name;
} /// <summary>
/// 获取实体的TableName
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
private string GetQueryTableName<T>()
where T : FindObjectBase
{
var tableCfgInfo = AttributeHelper.Get<T,TableAttribute>();
return tableCfgInfo != null ? tableCfgInfo.Name.Trim() : typeof(T).Name;
} /// <summary>
///执行与释放或重置非托管资源关联的应用程序定义的任务。
/// </summary>
public void Dispose()
{
if (CurrentTransaction != null)
{
CurrentTransaction.Dispose();
CurrentTransaction = null;
} CurrentConnection?.Dispose();
} public List<T> GetList<T>(T t) where T : FindObjectBase
{
string tableName = GetQueryTableName<T>();
StringBuilder sb = new StringBuilder();
sb.Append("SELECT * FROM ");
sb.Append($"{tableName} WITH(NOLOCK) ");
sb.Append(" WHERE 1=1 AND ");
var props = typeof(T).GetProperties().Where(p=>!p.Name.StartsWith("Chk_"));
foreach (var prop in props)
{
object obj = prop.GetValue(t, null);
if (obj != null)
{
if (prop.Name.ToUpper().StartsWith("LIKE_"))
{
sb.Append($" {prop.Name.Replace("LIKE_","")} LIKE {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("GT_"))
{
sb.Append($" {prop.Name.Replace("GT_", "")} > {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("ST_"))
{
sb.Append($" {prop.Name.Replace("ST_", "")} < {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("ST_Eq_"))
{
sb.Append($" {prop.Name.Replace("ST_Eq_", "")} <= {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("GT_Eq_"))
{
sb.Append($" {prop.Name.Replace("GT_Eq_", "")} >= {obj} AND ");
}
if (prop.Name.ToUpper().StartsWith("BETWEEN_"))
{
string[] array = obj.ToString().Split("|");
sb.Append($" {prop.Name.Replace("GT_Eq_", "")} BETWEEN {array.FirstOrDefault()} AND {array.LastOrDefault()} AND");
}
else
sb.Append($" {prop.Name}={obj} AND ");
}
}
string sql = sb.ToString().ToUpper().TrimEnd("AND ".ToCharArray());
return SqlQuery<T>(sql, null).ToList();
} public DataTable SqlQueryReturnDataTable(string sql, IDbDataParameter[] parameters)
{
var list = CurrentConnection.Query(sql, parameters);
return ConvertExtension.ToDataTable(list);
} #endregion Methods
}
请原谅我没有把这大段的代码收缩，如果你只是想跑起来看看，请忽略这些代码。后边有下载链接。
/// <summary>
/// 泛型仓储
/// </summary>
/// <typeparam name="T"></typeparam>
public class DapperRepository<T> : IRepository
where T : ModelBase
{
protected readonly DapperDbContextBase _dapperDbContext = null;
protected readonly string _tableName = null;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="dbContext"></param>
public DapperRepository(IDbContext dbContext)
{
_dapperDbContext = (DapperDbContextBase)dbContext;
TableAttribute tableCfgInfo = AttributeHelper.Get<T, TableAttribute>();
_tableName = tableCfgInfo != null ? tableCfgInfo.Name.Trim() : typeof(T).Name;
}
/// <summary>
/// 插入实体
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public bool Create<T1>(T1 entity) where T1 : ModelBase
{
return _dapperDbContext.Create(entity);
}
/// <summary>
/// 插入多个实体
/// </summary>
/// <param name="entities"></param>
/// <returns></returns>
public bool Create(IEnumerable<T> entities)
{
bool result = false;
using (IDbConnection connection = _dapperDbContext.CreateConnection())
{
using (IDbTransaction transaction = connection.BeginTransaction())
{
try
{
foreach (T item in entities)
{
connection.Insert(item, transaction);
}
transaction.Commit();
}
catch (Exception)
{
transaction.Rollback();
}
}
}
return result;
}
/// <summary>
/// 删除实体
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public bool Delete<T1>(T1 entity) where T1 : ModelBase
{
return _dapperDbContext.Delete(entity);
}
/// <summary>
/// 删除多个实体
/// </summary>
/// <param name="entities"></param>
/// <returns></returns>
public bool Delete(IEnumerable<T> entities)
{
bool result = false;
using (IDbConnection connection = _dapperDbContext.CreateConnection())
{
using (IDbTransaction transaction = connection.BeginTransaction())
{
try
{
foreach (T item in entities)
{
connection.Delete(item, transaction);
}
transaction.Commit();
result = true;
}
catch (Exception)
{
result = false;
transaction.Rollback();
}
}
}
return result;
}
/// <summary>
/// 检测实体是否存在
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public bool Exist<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return _dapperDbContext.Exist(predicate);
}
/// <summary>
/// 用主键ID获取实体
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="id"></param>
/// <returns></returns>
public T1 GetByKeyId<T1>(object id) where T1 : ModelBase
{
return _dapperDbContext.GetByKeyId<T1>(id);
}
/// <summary>
/// 根据实体ID获取实体 id可能不是主键
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public T Get(object id)
{
using (IDbConnection connection = _dapperDbContext.CreateConnection())
{
return connection.Get<T>(id);
}
}
/// <summary>
/// 按条件获取实体
/// </summary>
/// <param name="predicate"></param>
/// <returns></returns>
public List<T> Get(Expression<Func<T, bool>> predicate = null)
{
QueryResult queryResult = DynamicQuery.GetDynamicQuery(_tableName, predicate);
using (IDbConnection connection = _dapperDbContext.CreateConnection())
{
return connection.Query<T>(queryResult.Sql, (T)queryResult.Param).ToList();
}
}
/// <summary>
/// 获取符合条件的默认实体
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public T1 GetFirstOrDefault<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return _dapperDbContext.GetFirstOrDefault(predicate);
}
/// <summary>
/// 获取符合条件的集合
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public List<T1> GetList<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return _dapperDbContext.GetList(predicate);
}
/// <summary>
/// 执行自定义查询
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public IQueryable<T1> Query<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return _dapperDbContext.Query(predicate);
}
/// <summary>
/// 修改实体
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public bool Update<T1>(T1 entity) where T1 : ModelBase
{
return _dapperDbContext.Update(entity);
} public async Task<bool> DeleteAsync<T1>(T1 entity) where T1 : ModelBase
{
return await _dapperDbContext.DeleteAsync(entity);
} public async Task<bool> ExistAsync<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return await _dapperDbContext.ExistAsync(predicate);
} public async Task<T1> GetByKeyIdAsync<T1>(object id) where T1 : ModelBase
{
return await _dapperDbContext.GetByKeyIdAsync<T1>(id);
} public async Task<List<T1>> GetListAsync<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return await _dapperDbContext.GetListAsync(predicate);
} public async Task<T1> GetFirstOrDefaultAsync<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return await _dapperDbContext.GetFirstOrDefaultAsync(predicate);
} public async Task<bool> CreateAsync<T1>(T1 entity) where T1 : ModelBase
{
return await _dapperDbContext.CreateAsync(entity);
} public async Task<IQueryable<T1>> QueryAsync<T1>(Expression<Func<T1, bool>> predicate = default) where T1 : ModelBase
{
return await _dapperDbContext.QueryAsync(predicate);
} public async Task<bool> UpdateAsync<T1>(T1 entity) where T1 : ModelBase
{
return await _dapperDbContext.UpdateAsync(entity);
} public List<T1> GetList<T1>(T1 t) where T1 : FindObjectBase
{
return _dapperDbContext.GetList(t);
}
}
为什么要用Dapper呢？因为我们工厂的MES生产数据库单表有十几亿记录。如果你说这不是大数据，我就无语了。据我自己测试系统里的Radis缓存没有生效的情况下，数据库也能硬抗！
我不相信别人吹上天的某某ORM组件，我只相信自己见过的！
成品截图留念：
收获与感想
- 1、妥妥的吃了次螃蟹，收获了经验
- 2、正在“为自己挖一口井”的路上
- 3、动手写一回持久层，收获良多，终于搞清除ORM的原理
- 4、源码我是没自信放到github的，后面会加上下载链接
- 5、伙计们分享起来吧，这个生态建设任重而道远啊。