c# .netcore oracle鏈接工具類

1.先右鍵-》添加NeGet包-》引入Oracle.ManagedDataAccess.dll

2.將該類加入項目中

 

 

工具類：

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using Oracle.ManagedDataAccess.Client;

namespace IRCS.DBUtility
{
    /// <summary>
    /// Copyright (C) Maticsoft
    /// 數據訪問基礎類(基於Oracle)
    /// 能夠用戶能夠修改知足本身項目的須要。
    /// </summary>
    public abstract class DbHelperOra
    {
        //數據庫鏈接字符串(web.config來配置)，能夠動態更改connectionString支持多數據庫.        
        public static string connectionString = PubConstant.ConnectionString;     
        public DbHelperOra()
        {            
        }

        #region 公用方法
        
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        public static long GetLongMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return long.Parse(obj.ToString());
            }
        }

        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        public static bool Exists(string strSql, params OracleParameter[] cmdParms)
        {
            object obj = GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

       
        #endregion

        
        #region  執行簡單SQL語句

        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteSql(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {                
                using (OracleCommand cmd = new OracleCommand(SQLString,connection))
                {
                    try
                    {        
                        connection.Open();
                        int rows=cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch(OracleException E)
                    {                    
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }                
            }
        }
        
        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">多條SQL語句</param>        
        public static void ExecuteSqlTran(ArrayList SQLStringList)
        {
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                OracleCommand cmd = new OracleCommand();
                cmd.Connection=conn;                
                OracleTransaction tx=conn.BeginTransaction();            
                cmd.Transaction=tx;                
                try
                {           
                    for(int n=0;n<SQLStringList.Count;n++)
                    {
                        string strsql=SQLStringList[n].ToString();
                        if (strsql.Trim().Length>1)
                        {
                            cmd.CommandText=strsql;
                            cmd.ExecuteNonQuery();
                        }
                    }                                        
                    tx.Commit();                    
                }
                catch(OracleException E)
                {        
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
            }
        }
        /// <summary>
        /// 執行帶一個存儲過程參數的的SQL語句。
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <param name="content">參數內容,好比一個字段是格式複雜的文章，有特殊符號，能夠經過這個方式添加</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteSql(string SQLString,string content)
        {                
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(SQLString,connection);
                OracleParameter myParameter = new OracleParameter("@content", OracleDbType.NVarchar2);
                myParameter.Value = content ;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows=cmd.ExecuteNonQuery();
                    return rows;
                }
                catch(OracleException E)
                {                
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }    
            }
        }        
        /// <summary>
        /// 向數據庫裏插入圖像格式的字段(和上面狀況相似的另外一種實例)
        /// </summary>
        /// <param name="strSQL">SQL語句</param>
        /// <param name="fs">圖像字節,數據庫的字段類型爲image的狀況</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)
        {        
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(strSQL,connection);
                OracleParameter myParameter = new OracleParameter("@fs", OracleDbType.LongRaw);
                myParameter.Value = fs ;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows=cmd.ExecuteNonQuery();
                    return rows;
                }
                catch(OracleException E)
                {                
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }                
            }
        }
        
        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object GetSingle(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using(OracleCommand cmd = new OracleCommand(SQLString,connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
                        {                    
                            return null;
                        }
                        else
                        {
                            return obj;
                        }                
                    }
                    catch(OracleException e)
                    {                        
                        connection.Close();
                        throw new Exception(e.Message);
                    }    
                }
            }
        }
        /// <summary>
        /// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>OracleDataReader</returns>
        public static OracleDataReader ExecuteReader(string strSQL)
        {
            OracleConnection connection = new OracleConnection(connectionString);            
            OracleCommand cmd = new OracleCommand(strSQL,connection);                
            try
            {
                connection.Open();
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch(OracleException e)
            {                                
                throw new Exception(e.Message);
            }            
            
        }        
        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);                
                    command.Fill(ds,"ds");
                }
                catch(OracleException ex)
                {                
                    throw new Exception(ex.Message);
                }            
                return ds;
            }            
        }


        #endregion

        #region 執行帶參數的SQL語句

        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteSql(string SQLString,params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {                
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {        
                        PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                        int rows=cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch(OracleException E)
                    {                
                        throw new Exception(E.Message);
                    }
                }                
            }
        }
        
            
        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的OracleParameter[]）</param>
        public static void ExecuteSqlTran(Hashtable SQLStringList)
        {            
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction()) 
                {
                    OracleCommand cmd = new OracleCommand();
                    try 
                    {
                        //循環
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {    
                            string     cmdText=myDE.Key.ToString();
                            OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;
                            PrepareCommand(cmd,conn,trans,cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();

                            trans.Commit();
                        }                    
                    }
                    catch 
                    {
                        trans.Rollback();
                        throw;
                    }
                }                
            }
        }
    
                
        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object GetSingle(string SQLString,params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
                        {                    
                            return null;
                        }
                        else
                        {
                            return obj;
                        }                
                    }
                    catch(OracleException e)
                    {                
                        throw new Exception(e.Message);
                    }                    
                }
            }
        }
        
        /// <summary>
        /// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>OracleDataReader</returns>
        public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)
        {        
            OracleConnection connection = new OracleConnection(connectionString);
            OracleCommand cmd = new OracleCommand();                
            try
            {
                PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch(OracleException e)
            {                                
                throw new Exception(e.Message);
            }                    
            
        }        
        
        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString,params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                using( OracleDataAdapter da = new OracleDataAdapter(cmd) )
                {
                    DataSet ds = new DataSet();    
                    try
                    {                                                
                        da.Fill(ds,"ds");
                        cmd.Parameters.Clear();
                    }
                    catch(OracleException ex)
                    {                
                        throw new Exception(ex.Message);
                    }            
                    return ds;
                }                
            }            
        }


        private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, string cmdText, OracleParameter[] cmdParms) 
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null) 
            {
                foreach (OracleParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

        #endregion

        #region 存儲過程操做

        /// <summary>
        /// 執行存儲過程 返回SqlDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleDataReader</returns>
        public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
        {
            OracleConnection connection = new OracleConnection(connectionString);
            OracleDataReader returnReader;
            connection.Open();
            OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);                
            return returnReader;            
        }
        
        
        /// <summary>
        /// 執行存儲過程
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <param name="tableName">DataSet結果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                OracleDataAdapter sqlDA = new OracleDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
                sqlDA.Fill( dataSet, tableName );
                connection.Close();
                return dataSet;
            }
        }

        
        /// <summary>
        /// 構建 OracleCommand 對象(用來返回一個結果集，而不是一個整數值)
        /// </summary>
        /// <param name="connection">數據庫鏈接</param>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleCommand</returns>
        private static OracleCommand BuildQueryCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
        {            
            OracleCommand command = new OracleCommand( storedProcName, connection );
            command.CommandType = CommandType.StoredProcedure;
            foreach (OracleParameter parameter in parameters)
            {
                command.Parameters.Add( parameter );
            }
            return command;            
        }
        
        /// <summary>
        /// 執行存儲過程，返回影響的行數        
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <param name="rowsAffected">影響的行數</param>
        /// <returns></returns>
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                int result;
                connection.Open();
                OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["ReturnValue"].Value;
                //Connection.Close();
                return result;
            }
        }
        
        /// <summary>
        /// 建立 OracleCommand 對象實例(用來返回一個整數值)    
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleCommand 對象實例</returns>
        private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
        {
            OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );
            command.Parameters.Add( new OracleParameter ( "ReturnValue",
                OracleDbType.Int32, 4, ParameterDirection.ReturnValue,
                false,0,0,string.Empty,DataRowVersion.Default,null ));
            return command;
        }
        #endregion    

    }
}

 

獲取app.config配置文件中的數據庫鏈接的拓展類：

using IRCS.Common;
using Microsoft.Extensions.Configuration;
using System;
namespace IRCS.DBUtility
{
    
    public class PubConstant
    {        
        /// <summary>
        /// 獲取鏈接字符串
        /// </summary>
        public static string ConnectionString
        {           
            get 
            {
                try
                {
                    string _connectionString = AppConfigurtaionServices.Configuration["Appsettings:ConnectionString"];
                    return _connectionString;
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
        }

        public static string ConnectionString_MySQL
        {
            get
            {
                try
                {
                    string _connectionString = AppConfigurtaionServices.Configuration["Appsettings:ConnectionString_MYSQL"];
                    return _connectionString;
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
        }

        public static string ConnectionString_NpgSQL
        {
            get
            {

                string _connectionString = AppConfigurtaionServices.Configuration["Appsettings:ConnectionString_NpgSQL"];
                return _connectionString;
            }
        }

    }
}

如：