标签：语句 Core 实体 param 集合 sql 泛型 Net null
前言：Dapper是.NET的简单对象映射器，在速度方面拥有ORM之王的称号，与使用原始ADO.NET读取数据一样快。ORM是对象关系映射器，它负责数据库和编程语言之间的映射。
仓储主要是用来解耦业务逻辑层与数据访问层,降低耦合,使得程序在后期有很强的扩展性。
首先新建四个类库
IRepository:
Repository:
引用IRepository
IServices:
Services:
引用IServices、IRepository
导入两个包：Dapper,Npgsql(我用的是pgsql数据库)
万事俱备,上代码了。
IBaseRepository
public interface IBaseRepository<TEntity> where TEntity : class, new()
{
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定实体泛型</returns>
Task<TEntity> QueryFirst(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 返回 dataset
/// </summary>
/// <param name="sql"></param>
/// <param name="param"></param>
/// <param name="transaction"></param>
/// <param name="commandTimeout"></param>
/// <param name="commandType"></param>
/// <returns></returns>
Task<DataSet> Query(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定泛型集合</returns>
Task<IEnumerable<TEntity>> QueryList(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 简单分页，返回分页后的泛型集合
/// </summary>
/// <typeparam name="T">分页后的泛型集合</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="totalCount">返回 总记录数</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回分页后的泛型集合</returns>
Task<Tuple<IEnumerable<TEntity>, int>> QueryPagination(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 2条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <param name="sql">2条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>>> QueryMultiple<TFirst, TSecond>(string sql, object param = null);
/// <summary>
/// 3条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>>> QueryMultiple<TFirst, TSecond, TThird>(string sql, object param = null);
/// <summary>
/// 4条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>>> QueryMultiple<TFirst, TSecond, TThird, TFour>(string sql, object param = null);
/// <summary>
/// 5条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <typeparam name="TFive">实体集合五</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="tfiveList">返回第五条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>, List<TFive>>> QueryMultiple<TFirst, TSecond, TThird, TFour, TFive>(string sql, object param = null);
/// <summary>
/// 查询单个实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>泛型实体类型</returns>
Task<TEntity> QueryOne(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行sql语句，返回受影响的行数
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回受影响的行数</returns>
Task<int> Execute(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行sql语句，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="sql">查询Sql语句</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回返回第一行第一列</returns>
Task<TEntity> ExecuteScalar(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行存储过程，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="command">存储过程名称</param>
/// <param name="paras">参数键值对</param>
/// <returns>返回第一行第一列</returns>
Task<TEntity> Execute(string command, Dictionary<string, object> paras);
}
BaseRepository
public class BaseRepository<TEntity> : IBaseRepository<TEntity> where TEntity : class, new()
{
private readonly IConfiguration _configuration;
public BaseRepository(IConfiguration configuration) => this._configuration = configuration;
/// <summary>
/// 创建数据库连接，并打开连接
/// 连接字符串写在 json 配置文件里面
/// </summary>
/// <returns>IDbConnection</returns>
public IDbConnection GetOpenConn()
{
IDbConnection con = null;
string connectionString = _configuration["Connection:dbContent"];
con = new NpgsqlConnection(connectionString);
try
{
con.Open();
}
catch (Exception ex)
{
throw new Exception("数据库连接错误:" + ex.Message);
}
return con;
}
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定实体泛型</returns>
public async Task<TEntity> QueryFirst(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = this.GetOpenConn())
{
return con.QueryFirst<TEntity>(sql, param, transaction, commandTimeout, commandType);
}
}
/// <summary>
/// 返回 dataset
/// </summary>
/// <param name="sql"></param>
/// <param name="param"></param>
/// <param name="transaction"></param>
/// <param name="commandTimeout"></param>
/// <param name="commandType"></param>
/// <returns></returns>
public async Task<DataSet> Query(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = GetOpenConn())
{
IDataReader reader = con.ExecuteReader(sql, param, transaction, commandTimeout, commandType);
DataSet ds = new XDataSet();
ds.Load(reader, LoadOption.OverwriteChanges, null, new DataTable[] { });
return ds;
}
}
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定泛型集合</returns>
public async Task<IEnumerable<TEntity>> QueryList(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = GetOpenConn())
{
return con.Query<TEntity>(sql, param, transaction, buffered, commandTimeout, commandType);
}
}
/// <summary>
/// 简单分页，返回分页后的泛型集合
/// </summary>
/// <typeparam name="T">分页后的泛型集合</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="totalCount">返回 总记录数</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回分页后的泛型集合</returns>
public async Task<Tuple<IEnumerable<TEntity>, int>> QueryPagination(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = GetOpenConn())
{
var multi = con.QueryMultiple(sql, param, transaction, commandTimeout, commandType);
int totalCount = int.Parse(multi.Read<long>().Single().ToString());
return Tuple.Create<IEnumerable<TEntity>, int>(multi.Read<TEntity>(), totalCount);
}
}
/// <summary>
/// 2条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <param name="sql">2条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>>> QueryMultiple<TFirst, TSecond>(string sql, object param = null)
{
using (IDbConnection con = GetOpenConn())
{
var multi = con.QueryMultiple(sql, param);
var tfList = new List<TFirst>();
var tsList = new List<TSecond>();
if (!multi.IsConsumed)
{
tfList = multi.Read<TFirst>().ToList();
tsList = multi.Read<TSecond>().ToList();
}
return Tuple.Create<List<TFirst>, List<TSecond>>(tfList, tsList);
}
}
/// <summary>
/// 3条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>>> QueryMultiple<TFirst, TSecond, TThird>(string sql, object param = null)
{
using (IDbConnection con = GetOpenConn())
{
var multi = con.QueryMultiple(sql, param);
var tfList = new List<TFirst>();
var tsList = new List<TSecond>();
var ttList = new List<TThird>();
if (!multi.IsConsumed)
{
tfList = multi.Read<TFirst>().ToList();
tsList = multi.Read<TSecond>().ToList();
ttList = multi.Read<TThird>().ToList();
}
return Tuple.Create<List<TFirst>, List<TSecond>, List<TThird>>(tfList, tsList, ttList);
}
}
/// <summary>
/// 4条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>>> QueryMultiple<TFirst, TSecond, TThird, TFour>(string sql, object param = null)
{
using (IDbConnection con = GetOpenConn())
{
var multi = con.QueryMultiple(sql, param);
var tfList = new List<TFirst>();
var tsList = new List<TSecond>();
var ttList = new List<TThird>();
var tfourList = new List<TFour>();
if (!multi.IsConsumed)
{
tfList = multi.Read<TFirst>().ToList();
tsList = multi.Read<TSecond>().ToList();
ttList = multi.Read<TThird>().ToList();
tfourList = multi.Read<TFour>().ToList();
}
return Tuple.Create<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>>(tfList, tsList, ttList, tfourList);
}
}
/// <summary>
/// 5条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <typeparam name="TFive">实体集合五</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="tfiveList">返回第五条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>, List<TFive>>> QueryMultiple<TFirst, TSecond, TThird, TFour, TFive>(string sql, object param = null)
{
using (IDbConnection con = GetOpenConn())
{
var multi = con.QueryMultiple(sql, param);
var tfList = new List<TFirst>();
var tsList = new List<TSecond>();
var ttList = new List<TThird>();
var tfourList = new List<TFour>();
var tfiveList = new List<TFive>();
if (!multi.IsConsumed)
{
tfList = multi.Read<TFirst>().ToList();
tsList = multi.Read<TSecond>().ToList();
ttList = multi.Read<TThird>().ToList();
tfourList = multi.Read<TFour>().ToList();
tfiveList = multi.Read<TFive>().ToList();
}
return Tuple.Create<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>, List<TFive>>(tfList, tsList, ttList, tfourList, tfiveList);
}
}
/// <summary>
/// 查询单个实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>泛型实体类型</returns>
public async Task<TEntity> QueryOne(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
var dataResult = await QueryList(sql, param, transaction, buffered, commandTimeout, commandType);
return dataResult != null && dataResult.Count() > 0 ? dataResult.ToList()[0] : new TEntity();
}
/// <summary>
/// 执行sql语句，返回受影响的行数
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回受影响的行数</returns>
public async Task<int> Execute(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = GetOpenConn())
{
return con.Execute(sql, param, transaction, commandTimeout, commandType);
}
}
/// <summary>
/// 执行sql语句，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="sql">查询Sql语句</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回返回第一行第一列</returns>
public async Task<TEntity> ExecuteScalar(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
using (IDbConnection con = GetOpenConn())
{
return con.ExecuteScalar<TEntity>(sql, param, transaction, commandTimeout, commandType);
}
}
/// <summary>
/// 执行存储过程，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="command">存储过程名称</param>
/// <param name="paras">参数键值对</param>
/// <returns>返回第一行第一列</returns>
public async Task<TEntity> Execute(string command, Dictionary<string, object> paras)
{
using (IDbConnection con = GetOpenConn())
{
IDbCommand com = con.CreateCommand();
com.CommandText = command;
com.CommandType = CommandType.StoredProcedure;
if (paras != null)
{
foreach (var item in paras.Keys)
{
IDbDataParameter para = com.CreateParameter();
para.Value = paras[item];
para.ParameterName = item;
com.Parameters.Add(para);
}
}
return (TEntity)com.ExecuteScalar();
}
}
/// <summary>
/// 数据适配器，扩展Fill方法
/// .NET的DataSet.Load方法，底层调用DataAdapter.Fill(DataTable[], IDataReader, int, int)
/// Dapper想要返回DataSet，需要重写Load方法，不必传入DataTable[]，因为数组长度不确定
/// </summary>
public class XLoadAdapter : DataAdapter
{
/// <summary>
/// 数据适配器
/// </summary>
public XLoadAdapter()
{
}
/// <summary>
/// 读取dataReader
/// </summary>
/// <param name="ds"></param>
/// <param name="dataReader"></param>
/// <param name="startRecord"></param>
/// <param name="maxRecords"></param>
/// <returns></returns>
public int FillFromReader(DataSet ds, IDataReader dataReader, int startRecord, int maxRecords)
{
return this.Fill(ds, "Table", dataReader, startRecord, maxRecords);
}
}
/// <summary>
/// 扩展Load方法
/// </summary>
public class XDataSet : DataSet
{
/// <summary>
/// Dapper想要返回DataSet，需要重写Load方法
/// </summary>
/// <param name="reader">IDataReader</param>
/// <param name="loadOption">LoadOption</param>
/// <param name="handler">FillErrorEventHandler</param>
/// <param name="tables">DataTable</param>
public override void Load(IDataReader reader, LoadOption loadOption, FillErrorEventHandler handler, params DataTable[] tables)
{
XLoadAdapter adapter = new XLoadAdapter
{
FillLoadOption = loadOption,
MissingSchemaAction = MissingSchemaAction.AddWithKey
};
if (handler != null)
{
adapter.FillError += handler;
}
adapter.FillFromReader(this, reader, 0, 0);
if (!reader.IsClosed && !reader.NextResult())
{
reader.Close();
}
}
}
}
IBaseServices
public interface IBaseServices<TEntity> where TEntity : class
{
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定实体泛型</returns>
Task<TEntity> QueryFirst(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 返回 dataset
/// </summary>
/// <param name="sql"></param>
/// <param name="param"></param>
/// <param name="transaction"></param>
/// <param name="commandTimeout"></param>
/// <param name="commandType"></param>
/// <returns></returns>
Task<DataSet> Query(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定泛型集合</returns>
Task<IEnumerable<TEntity>> QueryList(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 简单分页，返回分页后的泛型集合
/// </summary>
/// <typeparam name="T">分页后的泛型集合</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="totalCount">返回 总记录数</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回分页后的泛型集合</returns>
Task<Tuple<IEnumerable<TEntity>, int>> QueryPagination(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 2条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <param name="sql">2条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>>> QueryMultiple<TFirst, TSecond>(string sql, object param = null);
/// <summary>
/// 3条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>>> QueryMultiple<TFirst, TSecond, TThird>(string sql, object param = null);
/// <summary>
/// 4条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>>> QueryMultiple<TFirst, TSecond, TThird, TFour>(string sql, object param = null);
/// <summary>
/// 5条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <typeparam name="TFive">实体集合五</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="tfiveList">返回第五条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>, List<TFive>>> QueryMultiple<TFirst, TSecond, TThird, TFour, TFive>(string sql, object param = null);
/// <summary>
/// 查询单个实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>泛型实体类型</returns>
Task<TEntity> QueryOne(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行sql语句，返回受影响的行数
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回受影响的行数</returns>
Task<int> Execute(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行sql语句，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="sql">查询Sql语句</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回返回第一行第一列</returns>
Task<TEntity> ExecuteScalar(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null);
/// <summary>
/// 执行存储过程，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="command">存储过程名称</param>
/// <param name="paras">参数键值对</param>
/// <returns>返回第一行第一列</returns>
Task<TEntity> Execute(string command, Dictionary<string, object> paras);
}
BaseServices
public class BaseServices<TEntity> : IBaseServices<TEntity> where TEntity : class, new()
{
public IBaseRepository<TEntity> BaseDal;
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定实体泛型</returns>
public async Task<TEntity> QueryFirst(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
return await BaseDal.QueryFirst(sql, param, transaction, commandTimeout, commandType);
}
public Task<DataSet> Query(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
return BaseDal.Query(sql, param, transaction, commandTimeout, commandType);
}
/// <summary>
/// 查询数据集合
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回指定泛型集合</returns>
public async Task<IEnumerable<TEntity>> QueryList(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
return await BaseDal.QueryList(sql, param, transaction, buffered, commandTimeout, commandType);
}
/// <summary>
/// 简单分页，返回分页后的泛型集合
/// </summary>
/// <typeparam name="T">分页后的泛型集合</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="totalCount">返回 总记录数</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回分页后的泛型集合</returns>
public async Task<Tuple<IEnumerable<TEntity>, int>> QueryPagination(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
return await BaseDal.QueryPagination(sql, param, transaction, buffered, commandTimeout, commandType);
}
/// <summary>
/// 2条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <param name="sql">2条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>>> QueryMultiple<TFirst, TSecond>(string sql, object param = null)
{
return await BaseDal.QueryMultiple<TFirst, TSecond>(sql, param);
}
/// <summary>
/// 3条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>>> QueryMultiple<TFirst, TSecond, TThird>(string sql, object param = null)
{
return await BaseDal.QueryMultiple<TFirst, TSecond, TThird>(sql, param);
}
/// <summary>
/// 4条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>>> QueryMultiple<TFirst, TSecond, TThird, TFour>(string sql, object param = null)
{
return await BaseDal.QueryMultiple<TFirst, TSecond, TThird, TFour>(sql, param);
}
/// <summary>
/// 5条Sql语句查询
/// </summary>
/// <typeparam name="TFirst">实体集合一</typeparam>
/// <typeparam name="TSecond">实体集合二</typeparam>
/// <typeparam name="TThird">实体集合三</typeparam>
/// <typeparam name="TFour">实体集合四</typeparam>
/// <typeparam name="TFive">实体集合五</typeparam>
/// <param name="sql">5条查询语句</param>
/// <param name="tfList">返回第一条语句的实体集合</param>
/// <param name="tsList">返回第二条语句的实体集合</param>
/// <param name="ttList">返回第三条语句的实体集合</param>
/// <param name="tfourList">返回第四条语句的实体集合</param>
/// <param name="tfiveList">返回第五条语句的实体集合</param>
/// <param name="param">参数值（可选）</param>
public async Task<Tuple<List<TFirst>, List<TSecond>, List<TThird>, List<TFour>, List<TFive>>> QueryMultiple<TFirst, TSecond, TThird, TFour, TFive>(string sql, object param = null)
{
return await BaseDal.QueryMultiple<TFirst, TSecond, TThird, TFour, TFive>(sql, param);
}
/// <summary>
/// 查询单个实体类型
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="buffered">是否将查询结果缓存到内存中（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>泛型实体类型</returns>
public async Task<TEntity> QueryOne(string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
{
return await BaseDal.QueryOne(sql, param, transaction, buffered, commandTimeout, commandType);
}
/// <summary>
/// 执行sql语句，返回受影响的行数
/// </summary>
/// <param name="sql">查询Sql语句或存储过程名称</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回受影响的行数</returns>
public async Task<int> Execute(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
return await BaseDal.Execute(sql, param, transaction, commandTimeout, commandType);
}
/// <summary>
/// 执行sql语句，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="sql">查询Sql语句</param>
/// <param name="param">参数值（可选）</param>
/// <param name="transaction">事务名称（可选）</param>
/// <param name="commandTimeout">超时时间（可选）</param>
/// <param name="commandType">指定如果解释sql字符串：语句/存储过程（可选）</param>
/// <returns>返回返回第一行第一列</returns>
public async Task<TEntity> ExecuteScalar(string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null)
{
return await ExecuteScalar(sql, param, transaction, commandTimeout, commandType);
}
/// <summary>
/// 执行存储过程，返回第一行第一列
/// </summary>
/// <typeparam name="T">指定类型</typeparam>
/// <param name="command">存储过程名称</param>
/// <param name="paras">参数键值对</param>
/// <returns>返回第一行第一列</returns>
public async Task<TEntity> Execute(string command, Dictionary<string, object> paras)
{
return await BaseDal.Execute(command, paras);
}
}
下面写一个简单的查询,用户登录判断用户名与密码
public interface IUserInfoRepository: IBaseRepository<UserInfo>
{
}
public class UserInfoRepository : BaseRepository<UserInfo>, IUserInfoRepository
{
public UserInfoRepository(IConfiguration configuration) : base(configuration)
{
}
}
public interface IUserInfoServices:IBaseServices<UserInfo>
{
Task<IEnumerable<UserInfo>> QueryUserInfo(string userName, string password);
}
public class UserInfoServices : BaseServices<UserInfo>, IUserInfoServices
{
IUserInfoRepository _dal;
public UserInfoServices(IUserInfoRepository dal)
{
this._dal = dal;
base.BaseDal = dal;
}
public async Task<IEnumerable<UserInfo>> QueryUserInfo(string userName, string password)
{
var Result = await _dal.QueryList($"SELECT * FROM user_info where user_name='{userName}' and password='{password}' limit 1 OFFSET 0");
return Result;
}
}
在控制器中以依赖注入的形式使用(前提是你要借助IOC容器注入好你要使用的对象)，如果对此有困惑,可看下面这篇博客：
https://www.cnblogs.com/zhangnever/p/12324133.html
至此就没有了,各位同学可以再行封装。
如有不足的地方,还望见谅！
转 https://www.cnblogs.com/zhangnever/p/11926045.html
标签：语句,Core,实体,param,集合,sql,泛型,Net,null 来源： https://www.cnblogs.com/wl-blog/p/16414637.html
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