dapper

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工具类

需要安装nuget包：dapper、dapper.contrib

public class DapperHelper
    {

        //数据库连接字符串
        private string connectionString;

        public DapperHelper(string connectionString)
        {
            this.connectionString = connectionString;
        }


        //private  readonly string connectionString = "Server=127.0.0.1;Database=shuigong;Uid=root;Pwd=123456;";

        public DbConnection GetDbConnection()
        {
            DbConnection connection =new OracleConnection(connectionString);
            connection.Open();
            return connection;
        }


        /// 

        /// 查询列表
        /// 
        /// 查询的sql
        /// 替换参数
        /// 
        public List Query(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.Query(sql, param).ToList();
            }
        }

        /// 

        /// 查询列表
        /// 
        /// 查询的sql
        /// 替换参数
        /// 
        public IEnumerable Query(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.Query(sql, param);
            }
        }

        /// 

        /// 查询第一个数据
        /// 
        /// 
        /// 
        /// 
        public T QueryFirst(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QueryFirst(sql, param);
            }
        }

        /// 

        /// 查询第一个数据
        /// 
        /// 
        /// 
        /// 
        public dynamic QueryFirst(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QueryFirst(sql, param);
            }
        }

        /// 

        /// 查询第一个数据没有返回默认值
        /// 
        /// 
        /// 
        /// 
        public T QueryFirstOrDefault(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QueryFirstOrDefault(sql, param);
            }
        }

        /// 

        /// 查询第一个数据没有返回默认值
        /// 
        /// 
        /// 
        /// 
        public dynamic QueryFirstOrDefault(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QueryFirstOrDefault(sql, param);
            }
        }

        /// 

        /// 查询单条数据
        /// 
        /// 
        /// 
        /// 
        public T QuerySingle(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QuerySingle(sql, param);
            }
        }

        /// 

        /// 查询单条数据
        /// 
        /// 
        /// 
        /// 
        public dynamic QuerySingle(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QuerySingle(sql, param);
            }
        }

        /// 

        /// 查询单条数据没有返回默认值
        /// 
        /// 
        /// 
        /// 
        public T QuerySingleOrDefault(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QuerySingleOrDefault(sql, param);
            }
        }

        /// 

        /// 查询单条数据没有返回默认值
        /// 
        /// 
        /// 
        /// 
        public dynamic QuerySingleOrDefault(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.QuerySingleOrDefault(sql, param);
            }
        }

        /// 

        /// 增删改
        /// 
        /// 
        /// 
        /// 
        public int Execute(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.Execute(sql, param);
            }
        }

        /// 

        /// 根据实体类插入表（实体类需要加标记处理）
        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        public async Task InsertAsync(T model, IDbTransaction transaction = null, int? commandTimeout = null) where T : class, new()
        {
            using (DbConnection conn = GetDbConnection())
            {
                return await conn.InsertAsync(model, transaction, commandTimeout);
            }
        }

        /// 

        /// 根据实体类更新表（实体类需要加标记处理）
        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        public async Task UpdateAsync(T model, IDbTransaction transaction = null, int? commandTimeout = null) where T : class, new()
        {
            using (DbConnection conn = GetDbConnection())
            {
                bool b = await conn.UpdateAsync(model, transaction, commandTimeout);
                return b;
            }
        }


        /// 

        /// 根据实体类删除表（实体类需要加标记处理）
        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        public async Task DeleteAsync(T model, IDbTransaction transaction = null, int? commandTimeout = null) where T : class, new()
        {
            using (DbConnection conn = GetDbConnection())
            {
                bool b = await conn.DeleteAsync(model, transaction, commandTimeout);
                return b;
            }
        }

        /// 

        /// Reader获取数据
        /// 
        /// 
        /// 
        /// 
        public IDataReader ExecuteReader(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.ExecuteReader(sql, param);
            }
        }

        /// 

        /// Scalar获取数据
        /// 
        /// 
        /// 
        /// 
        public object ExecuteScalar(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.ExecuteScalar(sql, param);
            }
        }

        /// 

        /// Scalar获取数据
        /// 
        /// 
        /// 
        /// 
        public T ExecuteScalarFor(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.ExecuteScalar(sql, param);
            }
        }

        /// 

        /// Scalar获取数据
        /// 
        /// 
        /// 
        /// 
        public dynamic ExecuteScalarFor(string sql, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                return con.ExecuteScalar(sql, param);
            }
        }

        /// 

        /// 带参数的存储过程
        /// 
        /// 
        /// 
        /// 
        public List ExecutePro(string proc, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                List list = con.Query(proc,
                    param,
                    null,
                    true,
                    null,
                    CommandType.StoredProcedure).ToList();
                return list;
            }
        }
        /// 

        /// 带参数的存储过程
        /// 
        /// 
        /// 
        /// 
        public List ExecutePro(string proc, object param)
        {
            using (IDbConnection con = GetDbConnection())
            {
                List list = con.Query(proc,
                    param,
                    null,
                    true,
                    null,
                    CommandType.StoredProcedure).ToList();
                return list;
            }
        }

        /// 

        /// 事务1 - 全SQL
        /// 
        /// 多条SQL
        /// param
        /// 
        public int ExecuteTransaction(string[] sqlarr)
        {
            using (IDbConnection con = GetDbConnection())
            {
                using (IDbTransaction transaction = con.BeginTransaction())
                {
                    try
                    {
                        int result = 0;
                        foreach (string sql in sqlarr)
                        {
                            result += con.Execute(sql, null, transaction);
                        }

                        transaction.Commit();
                        return result;
                    }
                    catch (Exception)
                    {
                        transaction.Rollback();
                        return 0;
                    }
                }
            }
        }

        /// 

        /// 事务2 - 声明参数
        ///demo:
        ///dic.Add("Insert into Users values (@UserName, @Email, @Address)",
        ///        new { UserName = "jack", Email = "380234234@qq.com", Address = "上海" });
        /// 
        /// 多条SQL
        /// param
        /// 
        public int ExecuteTransaction(Dictionary dic)
        {
            using (IDbConnection con = GetDbConnection())
            {
                using (IDbTransaction transaction = con.BeginTransaction())
                {
                    try
                    {
                        int result = 0;
                        foreach (KeyValuePair sql in dic)
                        {
                            result += con.Execute(sql.Key, sql.Value, transaction);
                        }

                        transaction.Commit();
                        return result;
                    }
                    catch (Exception)
                    {
                        transaction.Rollback();
                        return 0;
                    }
                }
            }
        }
    }

使用oracle时候的动态参数需要在替换的变量前使用英文冒号

动态参数

 DapperHelper dapperHelper = new DapperHelper(ConnectTypeEnum.Oracle,
                "Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(SERVER = test)(SERVICE_NAME = test)));User ID=test;Password=test;");
var data = dapperHelper.Query("select * from Test where ID=:ID", new { ID= "string" });            

DynamicParameters parameters = new DynamicParameters();
            parameters.Add("@ID", "string", System.Data.DbType.String);
DapperHelper dapperHelper = new DapperHelper(ConnectTypeEnum.Oracle,
                "Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(SERVER = test)(SERVICE_NAME = test)));User ID=test;Password=test;");
var data = dapperHelper.Query("select * from Test where ID=:ID", parameters  });            

//字典转动态参数列表
Dictionary dictionary = new Dictionary();
            dictionary.Add("@ID", "string");
            var dbArgs = new DynamicParameters(dictionary);
DapperHelper dapperHelper = new DapperHelper(ConnectTypeEnum.Oracle,
                "Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(SERVER = test)(SERVICE_NAME = test)));User ID=test;Password=test;");
var data = dapperHelper.Query("select * from Test where ID=:ID", dbArgs });