MySqlBulkLoader 使用

本文主要是介绍MySqlBulkLoader 使用，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

 1 public bool TranBatchImportData(DataSet dataSet)
 2         {
 3             string fileServerPath = System.Web.Hosting.HostingEnvironment.MapPath("/");
 4             if (dataSet != null && dataSet.Tables.Count > 0)
 5             {
 6                 using (MySqlConnection conn = (MySqlConnection)GetSQLConnection())
 7                 {
 8                     if (conn.State != ConnectionState.Open)
 9                     {
10                         conn.Open();
11                     }
12                     foreach (DataTable dt in dataSet.Tables)
13                     {
14                         if (dt.Rows.Count == 0) continue;
15 
16                         string tmpPath = fileServerPath + "Uploads\\UpTemp";
17                         if (!Directory.Exists(tmpPath))
18                             Directory.CreateDirectory(tmpPath);
19                         tmpPath = Path.Combine(tmpPath, "Temp.csv");//csv文件临时目录
20                         if (File.Exists(tmpPath))
21                         {
22                             File.Delete(tmpPath);
23                         }
24                         string csv = DataTableToCsv(dt);
25                         File.WriteAllText(tmpPath, csv, new UTF8Encoding(false));
26 
27 
28                         int insertCount = 0;
29                         //MySqlTransaction tran = conn.BeginTransaction();
30                         MySqlBulkLoader bulk = new MySqlBulkLoader(conn)
31                         {
32                             FieldTerminator = ",",
33                             FieldQuotationCharacter = '"',
34                             EscapeCharacter = '"',
35                             LineTerminator = Environment.NewLine, //"\r\n",
36                             FileName = tmpPath,
37                             //Local = true,
38                             NumberOfLinesToSkip = 0,
39                             TableName = dt.TableName,
40                             CharacterSet = "utf8"
41                         };
42                         try
43                         {
44                             bulk.Columns.AddRange(dt.Columns.Cast<DataColumn>().Select(colum => colum.ColumnName).ToList());
45                             insertCount = bulk.Load();
46                         }
47                         catch (MySqlException ex)
48                         {
49                             throw ex;
50                         }
51                         finally
52                         {
53                             if (File.Exists(tmpPath))
54                             {
55                                 File.Delete(tmpPath);
56                             }
57                         }
58 
59                     }
60                     return true;
61                 }
62             }
63 
64             return false;
65         }

 1 private static string DataTableToCsv(DataTable table)
 2         {
 3             //以半角逗号（即,）作分隔符，列为空也要表达其存在。  
 4             //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。  
 5             //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。  
 6             StringBuilder sb = new StringBuilder();
 7             DataColumn colum;
 8             foreach (DataRow row in table.Rows)
 9             {
10                 for (int i = 0; i < table.Columns.Count; i++)
11                 {
12                     colum = table.Columns[i];
13                     if (i != 0) sb.Append(",");
14                     if (colum.DataType == typeof(string) && row[colum].ToString().Contains(","))
15                     {
16                         sb.Append(row[colum].Equals(DBNull.Value) ? "NULL" : ("\"" + row[colum].ToString().Replace("\"", "\"\"") + "\""));
17                     }
18                     else sb.Append(row[colum].Equals(DBNull.Value) ? "NULL" : row[colum].ToString());
19                 }
20                 sb.AppendLine();
21             }
22             return sb.ToString();
23         }

避坑

1、插入NULL到数据库时，使用“NULL”：sb.Append(row[colum].Equals(DBNull.Value) ? "NULL" : row[colum].ToString());

2、生成csv时，注意保存得格式，windows保存utf8时会保存成utf8-bom，保存时使用new UTF8Encoding(false)：File.WriteAllText(tmpPath, csv, new UTF8Encoding(false));

3、设置MySqlBulkLoader.CharacterSet = "utf8"和数据库连接一致value="server=*********;database=********;uid=root;pwd=*********;charset='utf8';SslMode=****"

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