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

/// <summary>
/// 数据库工具
/// </summary>
public class DatabaseUtil
{
    /// <summary>
    /// 数据库连接语句
    /// </summary>
    private static string strConn = "数据库链接语句";


    /// <summary>
    /// 执行sql查询语句
    /// </summary>
    /// <param name="strSql"></param>
    /// <param name="strError"></param>
    /// <returns></returns>
    public static DataSet ExecSqlSelect(string strSql, ref string strError)
    {
        try
        {
            DataSet resDs = new DataSet();
            SqlConnection con = new SqlConnection(strConn);
            con.Open();
            SqlDataAdapter sda = new SqlDataAdapter(strSql, con);
            sda.Fill(resDs);
            con.Close();
            sda.Dispose();
            return resDs;
        }
        catch (Exception ex)
        {
            strError = ex.Message + "\n" + ex.StackTrace;
        }
        return null;
    }

    /// <summary>
    /// 插入
    /// </summary>
    /// <param name="tableName"></param>
    /// <param name="argDic"></param>
    /// <param name="strError"></param>
    /// <returns></returns>
    public static int ExectSqlInsert(string tableName, Dictionary<string, string> argDic, ref string strError)
    {
        try
        {
            string strArgName = string.Empty;
            string strArgValue = string.Empty;
            Dictionary<string, string>.Enumerator it = argDic.GetEnumerator();
            while (it.MoveNext())
            {
                strArgName += it.Current.Key + ",";
                strArgValue += "\‘" + it.Current.Value + "\‘" + ",";
            }

            strArgName = strArgName.Substring(0, strArgName.Length - 1);
            strArgValue = strArgValue.Substring(0, strArgValue.Length - 1);

            string strSql = "insert into " + tableName + " (" + strArgName + ") values (" + strArgValue + ")";
            SqlConnection con = new SqlConnection(strConn);
            con.Open();
            //操作数据库的工具SqlCommand
            SqlCommand cmd = new SqlCommand(strSql, con);
            int i = cmd.ExecuteNonQuery();
            con.Close();
            cmd.Dispose();
            return i;
        }
        catch (Exception ex)
        {
            strError = ex.Message + "\n" + ex.StackTrace;
            return 0;
        }
    }





    /// <summary>
    /// 添加、删除、修改
    /// </summary>
    /// <param name="strSql"></param>
    /// <param name="strError"></param>
    /// <returns></returns>
    public static int ExectSqlData(string strSql, ref string strError)
    {
        try
        {
            SqlConnection con = new SqlConnection(strConn);
            con.Open();
            //操作数据库的工具SqlCommand
            SqlCommand cmd = new SqlCommand(strSql, con);
            int i = cmd.ExecuteNonQuery();
            con.Close();
            cmd.Dispose();
            return i;
        }
        catch (Exception ex)
        {
            strError = ex.Message + "\n" + ex.StackTrace;
            return 0;
        }
    }



    /// <summary>
    /// 获取dataSet
    /// </summary>
    /// <param name="procName">存储过程名字</param>
    /// <param name="parirsDic">返回</param>
    /// <returns>返回dataset</returns>
    public static DataSet ExecProc(string procName, Dictionary<string, object> parirsDic)
    {
        SqlConnection conn = null;
        try
        {
            conn = new SqlConnection(strConn);
            Console.WriteLine("数据库连接成功！");

            //参数集
            Dictionary<string, SqlParameter> argDic = new Dictionary<string, SqlParameter>();//执行存储过程的

            if (parirsDic != null && parirsDic.Count > 0)
            {
                Dictionary<string, object>.Enumerator it = parirsDic.GetEnumerator();
                while (it.MoveNext())
                {
                    SqlParameter tempPar = new SqlParameter(it.Current.Key, it.Current.Value);
                    argDic.Add(it.Current.Key, tempPar);
                }
            }

            SqlCommand cmd = new SqlCommand(procName, conn);

            Dictionary<string, SqlParameter>.Enumerator it2 = argDic.GetEnumerator();
            while (it2.MoveNext())
            {
                cmd.Parameters.Add(it2.Current.Value);
            }
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter dap = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            //SqlCommandBuilder sqlBulider = new SqlCommandBuilder(dap);
            dap.Fill(ds);
            dap.Dispose();
            return ds;
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            if (conn != null)
            {
                //关闭数据库连接
                conn.Close();
            }
        }
    }



    /// <summary>
    /// 执行存储过程
    /// </summary>
    /// <param name="procName">存储过程名字</param>
    /// <param name="parirsDic">输入参数</param>
    /// <param name="outPutDic">输出参数</param>
    /// <returns></returns>
    public static int ExecProc(string procName, Dictionary<string, object> parirsDic, ref Dictionary<string, object> outPutDic)
    {
        SqlConnection conn = null;
        try
        {
            conn = new SqlConnection(strConn);
            Console.WriteLine("数据库连接成功！");

            //参数集
            Dictionary<string, SqlParameter> argDic = new Dictionary<string, SqlParameter>();//执行存储过程的

            if (parirsDic != null && parirsDic.Count > 0)
            {
                Dictionary<string, object>.Enumerator it = parirsDic.GetEnumerator();
                while (it.MoveNext())
                {
                    SqlParameter tempPar = new SqlParameter(it.Current.Key, it.Current.Value);
                    argDic.Add(it.Current.Key, tempPar);
                }
            }

            //设置错误代码返回值
            int errorId = 1000;
            SqlParameter returnPara = new SqlParameter("@return", errorId);
            returnPara.Direction = ParameterDirection.ReturnValue;
            argDic.Add("@return", returnPara);

            if (outPutDic != null && outPutDic.Count > 0)
            {
                Dictionary<string, object>.Enumerator it = outPutDic.GetEnumerator();
                while (it.MoveNext())
                {
                    SqlParameter tempPar = new SqlParameter(it.Current.Key, it.Current.Value);
                    tempPar.Direction = ParameterDirection.Output;
                    argDic.Add(it.Current.Key, tempPar);
                }
            }

            SqlCommand cmd = new SqlCommand(procName, conn);

            Dictionary<string, SqlParameter>.Enumerator it2 = argDic.GetEnumerator();
            while (it2.MoveNext())
            {
                cmd.Parameters.Add(it2.Current.Value);
            }
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter dap = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            dap.Fill(dt);
            dap.Dispose();
            errorId = Convert.ToInt32(argDic["@return"].Value);
            return errorId;
        }
        catch (Exception ex)
        {
            Console.WriteLine("数据库连接失败！" + ex.Message);
            return 2000;//后端执行异常
        }
        finally
        {
            if (conn != null)
            {
                //关闭数据库连接
                conn.Close();
            }
        }
    }



    /// <summary>
    /// 获取数据
    /// </summary>
    /// <param name="procName">存储过程名字</param>
    /// <param name="parirsDic">参数列表</param>
    /// <returns></returns>
    public static DataTable GetData(string procName, Dictionary<string, object> parirsDic)
    {
        SqlConnection conn = null;
        try
        {
            conn = new SqlConnection(strConn);
            conn.Open();
            //打开数据库连接
            //conn.Open();
            Console.WriteLine("数据库连接成功！");

            List<SqlParameter> parasList = new List<SqlParameter>();

            if (parirsDic != null && parirsDic.Count > 0)
            {
                Dictionary<string, object>.Enumerator it = parirsDic.GetEnumerator();
                while (it.MoveNext())
                {
                    parasList.Add(new SqlParameter(it.Current.Key, it.Current.Value));
                }
            }


            SqlCommand cmd = new SqlCommand(procName, conn);
            for (int i = 0; i < parasList.Count; i++)
            {
                cmd.Parameters.Add(parasList[i]);
            }
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter dap = new SqlDataAdapter(cmd);
            DataTable ds = new DataTable();
            dap.Fill(ds);
            return ds;
        }
        catch (Exception ex)
        {
            Console.WriteLine("数据库连接失败！" + ex.Message);
            throw ex;
        }
        finally
        {
            if (conn != null)
            {
                //关闭数据库连接
                conn.Close();
            }
        }
    }
}