using Oracle.DataAccess.Client;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
namespace WX.CRM.DAL.Util
{
    public class OracleDataAccessHandler
    {
        public static int BatchInsert(string tableName, DataTable dt)
        {
            OracleConnection connOracle = new OracleConnection(OracleHelper.AYCRMConn);
            connOracle.Open();
            var trans = connOracle.BeginTransaction();
            //Oracle.DataAccess.Client.OracleConnection connOracle = new Oracle.DataAccess.Client.OracleConnection(connectionString);
            try
            {
                string strfields = "";
                string strvalues = "";
                string filed = "";
                string strvalue = "";
                int count = 0;

                using (OracleDataAdapter da = new OracleDataAdapter())
                {
                    // OracleCommandBuilder ob = new OracleCommandBuilder(da);
                    foreach (DataColumn clomn in dt.Columns)
                    {
                        string strfiled = clomn.ColumnName;
                        strfields += strfiled + ",";
                        strvalues += ":" + strfiled + ",";
                    }
                    if (strfields != "")
                    {
                        strfields = strfields.Replace('(', '_').Replace(')', ' ').TrimEnd(',');
                        strvalues = strvalues.Replace('(', '_').Replace(')', ' ').TrimEnd(',');
                    }
                    da.InsertCommand = new OracleCommand();
                    da.InsertCommand.Transaction = trans;
                    da.InsertCommand.Connection = connOracle;
                    da.InsertCommand.CommandText = "INSERT INTO " + tableName + "(" + strfields + ") VALUES (" + strvalues + ")";
                    foreach (DataColumn clomn in dt.Columns)
                    {
                        filed = clomn.ColumnName;
                        strvalue = ":" + filed;
                        OracleParameter oparam = new OracleParameter();
                        oparam.ParameterName = strvalue;
                        oparam.SourceVersion = DataRowVersion.Current;
                        oparam.SourceColumn = filed;
                        da.InsertCommand.Parameters.Add(oparam);
                    }
                    count = da.Update(dt);
                    trans.Commit();
                }
                return count;
            }
            catch
            {
                trans.Rollback();
                throw;
            }
            finally
            {
                trans.Dispose();
                connOracle.Close();
            }
        }
        /**  
        * 批量插入数据  
        * @tableName 表名称  
        * @columnRowData 键-值存储的批量数据：键是列名称，值是对应的数据集合  
        * @conStr 连接字符串  
        */
        public static int BatchInsert2(string tableName, DataTable dt)
        {
            try
            {
                int len = 1000;
                if (string.IsNullOrEmpty(tableName))
                {
                    throw new ArgumentException("必须指定批量插入的表名称", "tableName");
                }

                int iResult = 0;
                StringBuilder sbCmdText = new StringBuilder();
                string strfields = "";
                string strvalues = "";

                foreach (DataColumn clomn in dt.Columns)
                {
                    string strfiled = clomn.ColumnName;
                    strfields += strfiled + ",";
                    strvalues += ":" + strfiled + ",";
                }
                if (strfields != "")
                {
                    strfields = strfields.Substring(0, strfields.LastIndexOf(","));
                    strvalues = strvalues.Substring(0, strvalues.LastIndexOf(","));
                }
                sbCmdText.Append("insert into " + tableName + "(" + strfields + ") values (" + strvalues + ")");
                using (OracleConnection conn = new OracleConnection(OracleHelper.AYCRMConn))
                {
                    using (OracleCommand cmd = conn.CreateCommand())
                    {
                        //绑定批处理的行数  
                        cmd.ArrayBindCount = len;
                        cmd.BindByName = true;
                        cmd.CommandType = CommandType.Text;
                        cmd.CommandText = sbCmdText.ToString();
                        cmd.CommandTimeout = 600;//10分钟

                        //创建参数
                        OracleParameter oraParam;
                        List<IDbDataParameter> cacher = new List<IDbDataParameter>();
                        OracleDbType dbType = OracleDbType.Object;
                        foreach (DataColumn column in dt.Columns)
                        {
                            dbType = GetOracleDbType(column.DataType.FullName);
                            oraParam = new OracleParameter(":" + column.ColumnName, dbType);
                            oraParam.Direction = ParameterDirection.Input;
                            oraParam.OracleDbTypeEx = dbType;
                            oraParam.Value = dt.AsEnumerable().Select(r => r[column.ColumnName]).ToArray();
                            cmd.Parameters.Add(oraParam);
                        }
                        //打开连接
                        conn.Open();

                        /*执行批处理*/
                        var trans = conn.BeginTransaction();
                        try
                        {
                            cmd.Transaction = trans;
                            iResult = cmd.ExecuteNonQuery();
                            trans.Commit();
                        }
                        catch (Exception ex)
                        {
                            trans.Rollback();
                            throw ex;
                        }
                        finally
                        {
                            if (conn != null) conn.Close();
                        }

                    }
                }
                return iResult;
            }
            catch { throw; }
            {
            }
        }
        /**  
         * 根据数据类型获取OracleDbType  
         */
        private static OracleDbType GetOracleDbType(object value)
        {
            OracleDbType dataType = OracleDbType.Object;
            if (value is string[])
            {
                dataType = OracleDbType.Varchar2;
            }
            else if (value is DateTime[])
            {
                dataType = OracleDbType.TimeStamp;
            }
            else if (value is int[] || value is short[])
            {
                dataType = OracleDbType.Int32;
            }
            else if (value is long[])
            {
                dataType = OracleDbType.Int64;
            }
            else if (value is decimal[] || value is double[] || value is float[])
            {
                dataType = OracleDbType.Decimal;
            }
            else if (value is Guid[])
            {
                dataType = OracleDbType.Varchar2;
            }
            else if (value is bool[] || value is Boolean[])
            {
                dataType = OracleDbType.Byte;
            }
            else if (value is byte[])
            {
                dataType = OracleDbType.Blob;
            }
            else if (value is char[])
            {
                dataType = OracleDbType.Char;
            }
            return dataType;
        }
        private static OracleDbType GetOracleDbType(string dbType)
        {
            OracleDbType dataType = OracleDbType.Object;
            if (dbType == "System.DateTime")
            {
                dataType = OracleDbType.Date;
            }
            else if (dbType == "System.Decimal")
            {
                dataType = OracleDbType.Decimal;
            }
            else
            {
                dataType = OracleDbType.NVarchar2;
            }
            return dataType;
        }
    }
}