using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using Microsoft.Practices.EnterpriseLibrary.Data;

namespace WebSqlHelper
{
    public class DbHelper
    {
        protected Database db;
        protected Database CreateDatabase(string name)
        {
            return db = DatabaseFactory.CreateDatabase(name);
        }
        protected Database CreateDatabase()
        {
            return db = DatabaseFactory.CreateDatabase();
        }
        public DbHelper(string name)
        {
            //db = DatabaseFactory.CreateDatabase(name); 
        }
        public DbHelper()
        {
            //db = DatabaseFactory.CreateDatabase();
        }
        public virtual DataSet LoadDataSet(string[] table, string str, params DbParameter[] param)
        {
            DbCommand cmd = db.GetSqlStringCommand(str);
            cmd.Parameters.AddRange(param);
            DataSet ds = new DataSet();
            db.LoadDataSet(cmd, ds, table);
            return ds;
        }
        #region Parameter
        public virtual DbParameter GetParameter()
        {
            return db.DbProviderFactory.CreateParameter();
        }
        /// <summary>
        /// Configures a given <see cref="DbParameter"/>.
        /// </summary>
        /// <param name="param">The <see cref="DbParameter"/> to configure.</param>
        /// <param name="name"><para>The name of the parameter.</para></param>
        /// <param name="dbType"><para>One of the <see cref="DbType"/> values.</para></param>
        /// <param name="size"><para>The maximum size of the data within the column.</para></param>
        /// <param name="direction"><para>One of the <see cref="ParameterDirection"/> values.</para></param>
        /// <param name="nullable"><para>Avalue indicating whether the parameter accepts <see langword="null"/> (<b>Nothing</b> in Visual Basic) values.</para></param>
        /// <param name="precision"><para>The maximum number of digits used to represent the <paramref name="value"/>.</para></param>
        /// <param name="scale"><para>The number of decimal places to which <paramref name="value"/> is resolved.</para></param>
        /// <param name="sourceColumn"><para>The name of the source column mapped to the DataSet and used for loading or returning the <paramref name="value"/>.</para></param>
        /// <param name="sourceVersion"><para>One of the <see cref="DataRowVersion"/> values.</para></param>
        /// <param name="value"><para>The value of the parameter.</para></param>  
        protected virtual void ConfigureParameter(DbParameter param, string name, DbType dbType, int size, ParameterDirection direction, bool nullable, byte precision, byte scale, string sourceColumn, DataRowVersion sourceVersion, object value)
        {
            param.ParameterName = name;
            param.DbType = dbType;
            param.Size = size;
            param.Value = (value == null) ? DBNull.Value : value;
            param.Direction = direction;
            param.IsNullable = nullable;
            param.SourceColumn = sourceColumn;
            param.SourceVersion = sourceVersion;
        }

        public virtual DbParameter GetParameter(string name, object value)
        {
            DbParameter param = GetParameter();
            ConfigureParameter(param, name, DbType.String, 0, ParameterDirection.Input, true, 0, 0, String.Empty, DataRowVersion.Default, value);
            return param;
        }
        public virtual DbParameter GetParameter(string name, object value, DbType dbtype)
        {
            DbParameter param = GetParameter();
            ConfigureParameter(param, name, dbtype, 0, ParameterDirection.Input, true, 0, 0, String.Empty, DataRowVersion.Default, value);
            return param;
        }
        #endregion

        public virtual DbCommand GetSqlStringCommand(string query, params DbParameter[] param)
        {
            DbCommand cmd = db.GetSqlStringCommand(query);
            cmd.Parameters.Clear();
            if (param != null && param.Length > 0)
            {
                foreach (DbParameter pr in param)
                    cmd.Parameters.Add(GetParameter(pr.ParameterName, pr.Value, pr.DbType));
            }

            return cmd;
        }
        #region 返回数据
        #region 通过Sql语句返回数据
        public virtual DataSet GetSqlStrDataSet(string query, params DbParameter[] param)
        {
            return GetSqlStrDataSet(null, query, param);
        }
        public virtual DataSet GetSqlStrDataSet(DbTransaction tran, string query, params DbParameter[] param)
        {
            try
            {
                if (tran != null)
                    return db.ExecuteDataSet(GetSqlStringCommand(query, param), tran);
                else
                    return db.ExecuteDataSet(GetSqlStringCommand(query, param));
            }
            catch (Exception ee)
            {
                throw new Exception(ee.Message + query);
            }
        }
        public virtual DataTable GetSqlStrTable(string query, params DbParameter[] param)
        {
            return GetSqlStrTable(null, query, param);
        }
        public virtual DataTable GetSqlStrTable(DbTransaction tran, string query, params DbParameter[] param)
        {
            DataSet ds = GetSqlStrDataSet(tran, query, param);
            if (ds != null && ds.Tables.Count > 0)
                return ds.Tables[0];
            return null;
        }
        public virtual DataRow GetSqlStrRow(string query, params DbParameter[] param)
        {
            return GetSqlStrRow(null, query, param);

        }
        public virtual DataRow GetSqlStrRow(DbTransaction tran, string query, params DbParameter[] param)
        {
            DataSet ds = GetSqlStrDataSet(tran, query, param);
            if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
                return ds.Tables[0].Rows[0];
            return null;
        }
        public virtual object GetSqlStrScalar(string query, params DbParameter[] param)
        {
            return GetSqlStrScalar(null, query, param);
        }
        public virtual object GetSqlStrScalar(DbTransaction tran, string query, params DbParameter[] param)
        {
            if (tran != null)
                return db.ExecuteScalar(GetSqlStringCommand(query, param), tran);
            else
                return db.ExecuteScalar(GetSqlStringCommand(query, param));
        }
        #endregion
        #region 通过存储过程语句返回数据
        public virtual DataSet GetSpDataSet(string proc, params object[] param)
        {
            return GetSpDataSet(null, proc, param);
        }

        public virtual DataSet GetSpDataSet(DbTransaction tran, string proc, params object[] param)
        {
            //object[] paras = (param!=null?new object[param.Length ]:new object[1]);
            //for(int i=0;i<param.Length;i++)
            //{
            //    paras[i] = param[i];
            //    if (paras[i] != null && paras[i].ToString() == "")
            //        paras[i] = null;
            //}
            //if(param!=null)
            //    paras[param.Length] = "";
            //else
            //paras[0] = "";
            if (tran != null)
                return db.ExecuteDataSet(tran, proc, param);
            else
                return db.ExecuteDataSet(proc, param);
        }
        public virtual DataTable GetSpTable(string query, params object[] param)
        {
            return GetSpTable(null, query, param);
        }
        public virtual DataTable GetSpTable(DbTransaction tran, string query, params object[] param)
        {
            DataSet ds = GetSpDataSet(tran, query, param);
            if (ds != null && ds.Tables.Count > 0)
                return ds.Tables[0];
            return null;
        }
        public virtual DataRow GetSpRow(string query, params object[] param)
        {
            return GetSpRow(null, query, param);

        }
        public virtual DataRow GetSpRow(DbTransaction tran, string query, params object[] param)
        {
            DataSet ds = GetSpDataSet(tran, query, param);
            if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
                return ds.Tables[0].Rows[0];
            return null;
        }
        public virtual object GetSpScalar(string query, params object[] param)
        {
            return GetSpScalar(null, query, param);
        }
        public virtual object GetSpScalar(DbTransaction tran, string query, params object[] param)
        {
            if (tran != null)
                return db.ExecuteScalar(query, param, tran);
            else
                return db.ExecuteScalar(query, param);
        }
        #endregion
        #endregion
        #region 直接执行

        public virtual int SetSqlStrNonQuery(string query, params DbParameter[] param)
        {
            return SetSqlStrNonQuery(null, query, param);
        }

        public virtual int SetSqlStrNonQuery(string query, LogHelper Opertor, params DbParameter[] param)
        {

            return SetSqlStrNonQuery(null, query, Opertor, param);
        }

        public virtual int SetSqlStrNonQuery(DbTransaction tran, string query, LogHelper Opertor, params DbParameter[] param)
        {
            //记录日志的执行方法
            //@Opertor 操作信息
            int result = 0;
            DbCommand dbcomm = GetSqlStringCommand(query, param);
            try
            {
                if (tran != null)
                    result = db.ExecuteNonQuery(dbcomm, tran);
                else
                    result = db.ExecuteNonQuery(dbcomm);
                //无执行错误,记录日志
                Opertor.ExecLoger(dbcomm);
                return result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        public virtual int SetSqlStrNonQuery(DbTransaction tran, string query, params DbParameter[] param)
        {
            DbCommand comm = GetSqlStringCommand(query, param);
            if (tran != null)
                return db.ExecuteNonQuery(GetSqlStringCommand(query, param), tran);
            else
                return db.ExecuteNonQuery(GetSqlStringCommand(query, param));
        }
        public virtual int SetSpNonQuery(string proc, params object[] param)
        {
            return db.ExecuteNonQuery(proc, param);
        }
        public virtual int SetSpNonQuery(DbTransaction tran, string proc, params DbParameter[] param)
        {
            if (tran != null)
                return db.ExecuteNonQuery(proc, param, tran);
            else
                return db.ExecuteNonQuery(proc, param);

        }
        #endregion
        #region Connection,Transaction
        public virtual DbConnection CreateConnection()
        {
            return db.CreateConnection();
        }
        public class TransWraper
        {
            public string Sql;
            public List<DbParameter> Param;
            public TransWraper(string sql, params DbParameter[] param)
            {
                Sql = sql;
                if (param != null && param.Length > 0)
                {
                    Param = new List<DbParameter>();
                    Param.AddRange(param);
                }
            }
        }
        public virtual void ExecuteTran(List<TransWraper> query)
        {
            using (DbConnection conn = CreateConnection())
            {
                conn.Open();
                DbTransaction tran = conn.BeginTransaction();
                try
                {
                    foreach (TransWraper tw in query)
                    {
                        if (tw != null)
                            SetSqlStrNonQuery(tran, tw.Sql, tw.Param.ToArray());
                        else
                            SetSqlStrNonQuery(tran, tw.Sql);
                    }
                    //SetSqlStrTranNonQuery(query, param);
                    tran.Commit();
                }
                catch
                {
                    tran.Rollback();
                }
            }
        }


        #endregion
        #region 分页函数
        public virtual DataTable ExecutePager(string tbname, string fields, string where, string orderby, int pagesize, int pageindex, ref int recordcount)
        { return null; }
        public virtual DataTable ExecutePager(string tbname, string fields, string where, string orderby, int pagesize, int pageindex, System.Data.Common.DbParameter[] param, ref int recordcount)
        { return null; }

        #endregion
        #region 自增
        public virtual int GetNext(string table, string field)
        {
            return GetNext(null, table, field);
        }
        public virtual int GetNext(DbTransaction tran, string table, string field)
        {
            object c = GetSqlStrScalar("select max(nvl2(translate(" + field + ",'\\1234567890','\\'),0," + field + ")) from " + table);
            if (c == null || c is DBNull)
                return 1;
            return int.Parse(c.ToString()) + 1;
        }
        public Guid GetNext()
        {
            return Guid.NewGuid();
        }
        public virtual string GetNext(DbTransaction tran, string table, string field, string format)
        {
            switch (format)
            {
                case "D":
                case "d"://080128
                    object c = GetSqlStrScalar("select max(case when ISNUMERIC(" + field + ")=1 then " + field + " else 0 end) from " + table + " where " + field + " like '" + DateTime.Now.ToString("yyMMdd") + "%'");
                    if (c == null || c is DBNull)
                        return DateTime.Now.ToString("yyMMdd") + "001";
                    else
                    {
                        string s1 = c.ToString().Substring(0, 6);
                        string s2 = c.ToString().Substring(6);
                        return s1 + (Int64.Parse(s2) + 1).ToString().PadLeft(3, '0');
                    }
                    break;
            }
            return GetNext(tran, table, field).ToString();
        }
        #endregion

        public virtual bool IsExist(string table, string field, string value)
        {
            return Convert.ToInt16(GetSqlStrScalar("select count(*) from " + table + " where " + field + "=@" + field, GetParameter(field, value))) > 0;
        }

        #region yjy 执行默认的sql文本
        //public virtual int SetSqlStrNonQuery(string query)
        //{
        //    return SetSqlStrNonQuery(null, query);
        //}
        //public virtual int SetSqlStrNonQuery(DbTransaction tran, string query)
        //{
        //    if (tran != null)
        //        return db.ExecuteNonQuery(GetSqlStringCommand(query,null),tran);
        //    else
        //        return db.ExecuteNonQuery( GetSqlStringCommand(query,null));
        //}
        #endregion
    }
}