c# .netcore oracle连接工具类

一时失言乱红尘 2023-06-05 12:31 28阅读 0赞

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

2.将该类加入项目中

![1067173-20190925162237100-1087973499.png][]

工具类：

using System;
    using System.Collections;
    using System.Collections.Specialized;
    using System.Data;
    using Oracle.ManagedDataAccess.Client;
    
    namespace IRCS.DBUtility
    {
        /// <summary>
        /// Copyright (C) Maticsoft
        /// 数据访问基础类(基于Oracle)
        /// 可以用户可以修改满足自己项目的需要。
        /// </summary>
        public abstract class DbHelperOra
        {
            //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.        
            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  执行简单SQL语句
    
            /// <summary>
            /// 执行SQL语句，返回影响的记录数
            /// </summary>
            /// <param name="SQLString">SQL语句</param>
            /// <returns>影响的记录数</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>
            /// 执行多条SQL语句，实现数据库事务。
            /// </summary>
            /// <param name="SQLStringList">多条SQL语句</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>
            /// 执行带一个存储过程参数的的SQL语句。
            /// </summary>
            /// <param name="SQLString">SQL语句</param>
            /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
            /// <returns>影响的记录数</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>
            /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
            /// </summary>
            /// <param name="strSQL">SQL语句</param>
            /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
            /// <returns>影响的记录数</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>
            /// 执行一条计算查询结果语句，返回查询结果（object）。
            /// </summary>
            /// <param name="SQLString">计算查询结果语句</param>
            /// <returns>查询结果（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>
            /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
            /// </summary>
            /// <param name="strSQL">查询语句</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>
            /// 执行查询语句，返回DataSet
            /// </summary>
            /// <param name="SQLString">查询语句</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 执行带参数的SQL语句
    
            /// <summary>
            /// 执行SQL语句，返回影响的记录数
            /// </summary>
            /// <param name="SQLString">SQL语句</param>
            /// <returns>影响的记录数</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>
            /// 执行多条SQL语句，实现数据库事务。
            /// </summary>
            /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的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 
                        {
                            //循环
                            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>
            /// 执行一条计算查询结果语句，返回查询结果（object）。
            /// </summary>
            /// <param name="SQLString">计算查询结果语句</param>
            /// <returns>查询结果（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>
            /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
            /// </summary>
            /// <param name="strSQL">查询语句</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>
            /// 执行查询语句，返回DataSet
            /// </summary>
            /// <param name="SQLString">查询语句</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 存储过程操作
    
            /// <summary>
            /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
            /// </summary>
            /// <param name="storedProcName">存储过程名</param>
            /// <param name="parameters">存储过程参数</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>
            /// 执行存储过程
            /// </summary>
            /// <param name="storedProcName">存储过程名</param>
            /// <param name="parameters">存储过程参数</param>
            /// <param name="tableName">DataSet结果中的表名</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>
            /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值)
            /// </summary>
            /// <param name="connection">数据库连接</param>
            /// <param name="storedProcName">存储过程名</param>
            /// <param name="parameters">存储过程参数</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>
            /// 执行存储过程，返回影响的行数        
            /// </summary>
            /// <param name="storedProcName">存储过程名</param>
            /// <param name="parameters">存储过程参数</param>
            /// <param name="rowsAffected">影响的行数</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>
            /// 创建 OracleCommand 对象实例(用来返回一个整数值)    
            /// </summary>
            /// <param name="storedProcName">存储过程名</param>
            /// <param name="parameters">存储过程参数</param>
            /// <returns>OracleCommand 对象实例</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    
    
        }
    }

获取app.config配置文件中的数据库连接的拓展类：

using IRCS.Common;
    using Microsoft.Extensions.Configuration;
    using System;
    namespace IRCS.DBUtility
    {
        
        public class PubConstant
        {        
            /// <summary>
            /// 获取连接字符串
            /// </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：

![1067173-20190925163532980-946750188.png][]

转载于:https://www.cnblogs.com/likui-bookHouse/p/11585713.html

[1067173-20190925162237100-1087973499.png]: /images/20230601/99610843b78140968c4518fbb41067fa.png
[1067173-20190925163532980-946750188.png]: /images/20230601/9f8ae75c7b2548ac99321e7a31304c01.png