winform中通用的数据库操作类

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Data;
using System.Data.SqlClient;

namespace 酒店管理系统
{
    public class DBManage
    {
        private static string connectionString ;

        //获取连接字符串，参数为服务器、数据库、用户名、密码
        public static void connectToServer(string server,string database,string user,string pwd)
        {

            string con = "server="+server+";database="+database+";uid="+user+";pwd="+pwd;
            DBManage.connectionString=con;
        }

        //执行SQL语句，返回影响的记录数
        public static int ExecuteSql(string SQLString)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(SQLString, connection);
               
            try
            {
                connection.Open();
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SqlClient.SqlException E)
            {
                connection.Close();
                throw new Exception(E.Message);
            }
            
        }

        //执行多条SQL语句，实现数据库事务。
        public static void ExecuteSqlTran(ArrayList SQLStringList)
        {
            SqlConnection conn = new SqlConnection(connectionString);            
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            SqlTransaction 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 (System.Data.SqlClient.SqlException E)
            {
                tx.Rollback();
                throw new Exception(E.Message);
            }            
        }

        //执行一条计算查询结果语句，返回查询结果（object）。
        public static object GetSingle(string SQLString)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(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 (System.Data.SqlClient.SqlException e)
            {
                connection.Close();
                throw new Exception(e.Message);
            }
        }
      

        //执行查询语句，返回SqlDataReader.
        public static SqlDataReader ExecuteReader(string strSQL)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(strSQL, connection);

            try
            {
                connection.Open();
                SqlDataReader myReader = cmd.ExecuteReader();
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw new Exception(e.Message);
            }

         }

         //执行查询语句，返回DataSet.
        public static DataSet Query(string SQLString)
        {
            SqlConnection connection = new SqlConnection(connectionString);
           
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                command.Fill(ds, "ds");
            }
            catch (System.Data.SqlClient.SqlException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds;
            
        }


        //参数为字段名和表名，返回最大值
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max (" + FieldName + ") from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        //构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)，参数为数据库连接、存储过程名、存储过程参数。
        public static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (SqlParameter parameter in parameters)
            {
                command.Parameters.Add(parameter);
            }
            return command;
        }

        //创建 SqlCommand 对象实例(用来返回一个整数值),参数为数据库连接、存储过程名、存储过程参数。
        public static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.Parameters.Add(new SqlParameter("ReturnValue",
                SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));
            return command;
        }


        //执行存储过程，返回SqlDataReader
        public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataReader returnReader;
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader();
            return returnReader;
        }

        //执行存储过程，返回结果集
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            SqlConnection connection = new SqlConnection(connectionString);           
            DataSet dataSet = new DataSet();
            connection.Open();
            SqlDataAdapter sqlDA = new SqlDataAdapter();
            sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
            sqlDA.Fill(dataSet, tableName);
            connection.Close();
            return dataSet;
            
        }

        //执行存储过程，返回影响的行数.
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            int result;
            connection.Open();
            SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
            rowsAffected = command.ExecuteNonQuery();
            result = (int)command.Parameters["ReturnValue"].Value;
            //Connection.Close();
            return result;
            
        }
        //public int count(string sqls)
        //{
        //    System.Data.SqlClient.SqlConnection sqlf = this.createConnection();
        //    System.Data.SqlClient.SqlCommand cmdf = new SqlCommand(sqls, sqlf);
        //    sqlf.Open();

        //    int num = Convert.ToInt32(cmdf.ExecuteScalar());
        //    if (num > 0)
        //    {
        //        sqlf.Close();
        //        return num;
        //    }
        //    else
        //    {
        //        sqlf.Close();
        //        return 0;

        //    }

        //} //返回执行结果的总数

    }
}

转载于:https://www.cnblogs.com/luozhanbin/archive/2008/07/12/1241564.html