大数据批量导入，解决办法，实践从定时从 sqlserver 批量同步数据到 mySql

c#代码，批量导入数据代码

public class MySql_Target : ZFCommon.DataAccesser.Base.DABase
    {

        public MySql_Target()
        {
            this.InitDataAccesser(ZFCommon.DataAccesser.DatabaseType.MySql, ReadConfig.TargetConnection);
        }
       ///大批量数据插入,返回成功插入行数  
        ///   
        /// 数据库连接字符串  
        /// 数据表  
        /// 返回成功插入行数  
        public  int BulkInsert( DataTable table)
        {
            if (string.IsNullOrEmpty(table.TableName)) throw new Exception("请给DataTable的TableName属性附上表名称");
            if (table.Rows.Count == 0) return 0;
            int insertCount = 0;
            string tmpPath = Path.GetTempFileName();
            string csv = DataTableToCsv(table);
            File.WriteAllText(tmpPath, csv);
            // MySqlTransaction tran = null;  

            using (MySqlConnection conn = new MySqlConnection(ReadConfig.TargetConnection))
            {

                try
                {

                    conn.Open();
                    //tran = conn.BeginTransaction();  
                    MySqlBulkLoader bulk = new MySqlBulkLoader(conn)
                    {
                        FieldTerminator = ",",
                        FieldQuotationCharacter = '"',
                        EscapeCharacter = '"',
                        LineTerminator = "\r\n",
                        FileName = tmpPath,
                        NumberOfLinesToSkip = 0,
                        TableName = table.TableName,
                    };
                    //bulk.Columns.AddRange(table.Columns.Cast().Select(colum => colum.ColumnName).ToArray());  
                    insertCount = bulk.Load();
                    // tran.Commit();  
                }
                catch (MySqlException ex)
                {
                    // if (tran != null) tran.Rollback();  
                    throw ex;
                }
            }
            File.Delete(tmpPath);
            return insertCount;
        }

        ///将DataTable转换为标准的CSV  
        ///   
        /// 数据表  
        /// 返回标准的CSV  
        private static string DataTableToCsv(DataTable table)
        {
            //以半角逗号（即,）作分隔符，列为空也要表达其存在。  
            //列内容如存在半角逗号（即,）则用半角引号（即""）将该字段值包含起来。  
            //列内容如存在半角引号（即"）则应替换成半角双引号（""）转义，并用半角引号（即""）将该字段值包含起来。  
            StringBuilder sb = new StringBuilder();
            DataColumn colum;
            foreach (DataRow row in table.Rows)
            {
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    colum = table.Columns[i];
                    if (i != 0) sb.Append(",");
                    if (colum.DataType == typeof(string) && row[colum].ToString().Contains(","))
                    {
                        sb.Append("\"" + row[colum].ToString().Replace("\"", "\"\"") + "\"");
                    }
                    else sb.Append(row[colum].ToString());
                }
                sb.AppendLine();
            }


            return sb.ToString();
        }  


    }

从sqlserver读取数据，并调用 上面导入代码

  //学生课表
        public int SyncStu_Course()
        {
            DataTable dataTable = this.GetDataTable("select * from V_Schedule_Stud");
            dataTable.TableName = "V_Schedule_Stud";
            MySql_Target tarDb = new MySql_Target();
            return tarDb.BulkInsert(dataTable);
        }

 

运行速度高效： 63万条数据 只需5分钟 导出并导入完成！

转载于:https://www.cnblogs.com/yzssoft/p/6961795.html