这篇文章主要介绍“如何利用MySqlBulkLoader实现批量插入数据”，在日常操作中，相信很多人在如何利用MySqlBulkLoader实现批量插入数据问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何利用MySqlBulkLoader实现批量插入数据”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
MySqlBulkLoader主要的实现方式：将需要插入的数据转成DataTable，DataTable转成一个CSV文件，将CSV文件使用批量导入的形式导入到数据库里面去。
注意：
1）.数据库连接地址需要添加配置AllowLoadLocalInfile=true,允许本地文件导入；
Data Source = 数据库地址; Port = 端口; Initial Catalog = 数据库名; User Id = 用户名; Password = 密码;AllowLoadLocalInfile=true;
2）.插入的时候会返回插入行数，但是检查所有的数据都正确，也没有报异常，却返回了插入数量为0，可以检查表是否有唯一索引，插入的数据是否违反了唯一索引。
/// <summary>
/// 将List转化为DataTable
/// </summary>
/// <returns></returns>
public DataTable ListToDataTable<T>(List<T> data)
{
#region 创建一个DataTable，以实体名称作为DataTable名称
var tableName = typeof(T).Name;
tableName = tableName.ToSnakeCase(); /*实体名称与表名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
DataTable dt = new DataTable
{
TableName = tableName
};
#endregion
#region 拿取列名，以实体的属性名作为列名
var properties = typeof(T).GetProperties();
foreach (var item in properties)
{
var curFileName = item.Name;
curFileName = curFileName.ToSnakeCase();/*列名与字段名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
dt.Columns.Add(curFileName);
}
#endregion
#region 列赋值
foreach (var item in data)
{
DataRow dr = dt.NewRow();
var columns = dt.Columns;
var curPropertyList = item.GetType().GetProperties();
foreach (var p in curPropertyList)
{
var name = p.Name;
name = name.ToSnakeCase();/*列名与字段名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
var curValue = p.GetValue(item);
int i = columns.IndexOf(name);
dr[i] = curValue;
}
dt.Rows.Add(dr);
}
#endregion
return dt;
}/// <summary>
/// csv扩展
/// </summary>
public static class CSVEx
{
/// <summary>
///将DataTable转换为标准的CSV文件
/// </summary>
/// <param name="table">数据表</param>
/// <param name="tmpPath">文件地址</param>
/// <returns>返回标准的CSV</returns>
public static void ToCsv(this DataTable table, string tmpPath)
{
//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++)
{
Type _datatype = typeof(DateTime);
colum = table.Columns[i];
if (i != 0) sb.Append("\t");
//if (colum.DataType == typeof(string) && row[colum].ToString().Contains(","))
//{
// sb.Append("\"" + row[colum].ToString().Replace("\"", "\"\"") + "\"");
//}
if (colum.DataType == _datatype)
{
sb.Append(((DateTime)row[colum]).ToString("yyyy/MM/dd HH:mm:ss"));
}
else sb.Append(row[colum].ToString());
}
sb.Append("\r\n");
}
StreamWriter sw = new StreamWriter(tmpPath, false, UTF8Encoding.UTF8);
sw.Write(sb.ToString());
sw.Close();
}
}/// <summary>
/// 批量导入mysql帮助类
/// </summary>
public static class MySqlHelper
{
/// <summary>
/// MySqlBulkLoader批量导入
/// </summary>
/// <param name="_mySqlConnection">数据库连接地址</param>
/// <param name="table"></param>
/// <param name="csvName"></param>
/// <returns></returns>
public static int BulkLoad(MySqlConnection _mySqlConnection, DataTable table, string csvName)
{
var columns = table.Columns.Cast<DataColumn>().Select(colum => colum.ColumnName).ToList();
MySqlBulkLoader bulk = new MySqlBulkLoader(_mySqlConnection)
{
FieldTerminator = "\t",
FieldQuotationCharacter = '"',
EscapeCharacter = '"',
LineTerminator = "\r\n",
FileName = csvName,
NumberOfLinesToSkip = 0,
TableName = table.TableName,
};
bulk.Columns.AddRange(columns);
return bulk.Load();
}
}/// <summary>
/// 使用MySqlBulkLoader批量插入数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
public int BulkLoaderData<T>(List<T> data)
{
if (data.Count <= 0) return 0;
var connectString = "数据库连接地址";
using (MySqlConnection connection = new MySqlConnection(connectString))
{
MySqlTransaction sqlTransaction = null;
try
{
if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
sqlTransaction = connection.BeginTransaction();
var dt = ListToDataTable<T>(data); //将List转成dataTable
string tmpPath = Path.GetTempFileName();
dt.ToCsv(tmpPath); //将DataTable转成CSV文件
var insertCount = MySqlHelper.BulkLoad(connection, dt, tmpPath); //使用MySqlBulkLoader插入数据
sqlTransaction.Commit();
try
{
if (File.Exists(tmpPath)) File.Delete(tmpPath);
}
catch (Exception)
{
//删除文件失败
}
return insertCount; //返回执行成功的条数
}
catch (Exception e)
{
if (sqlTransaction != null)
{
sqlTransaction.Rollback();
}
//执行异常
throw e;
}
}
}namespace WebApplication1.BrantchInsert
{
/// <summary>
/// 批量插入
/// </summary>
public class BulkLoader
{
/// <summary>
/// 测试批量插入入口
/// </summary>
/// <returns></returns>
public int BrantchDataTest()
{
#region 模拟数据
var data = new List<CrmCouponTestDto>() {
new CrmCouponTestDto {
Id=1,
CouponCode="test001",
CouponId = 1,
MemberId=100,
IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
UsageShopId=0,
UsageBillNo="",
EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
Status=0
},
new CrmCouponTestDto {
Id=2,
CouponCode="test002",
CouponId = 1,
MemberId=101,
IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
UsageTime=Convert.ToDateTime("2022-06-27 14:30:00"),
UsageShopId=2,
UsageBillNo="CS202206271430001",
EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
Status=1
},
new CrmCouponTestDto {
Id=3,
CouponCode="test003",
CouponId = 1,
MemberId=102,
IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
UsageShopId=0,
UsageBillNo="",
EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
Status=0
},
new CrmCouponTestDto {
Id=4,
CouponCode="test004",
CouponId = 1,
MemberId=103,
IssueTime=Convert.ToDateTime("2022-06-27 14:00:00"),
UsageTime=Convert.ToDateTime("3000-12-31 00:00:00"),
UsageShopId=0,
UsageBillNo="",
EffectiveStart=Convert.ToDateTime("2022-06-27 14:00:00"),
EffectiveEnd=Convert.ToDateTime("2023-06-27 14:00:00"),
Status=0
}
};
#endregion
var result = BulkLoaderData<CrmCouponTestDto>(data);
return result;
}
/// <summary>
/// 使用MySqlBulkLoader批量插入数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data"></param>
/// <returns></returns>
/// <exception cref="Exception"></exception>
public int BulkLoaderData<T>(List<T> data)
{
if (data.Count <= 0) return 0;
var connectString = "数据库连接地址";
using (MySqlConnection connection = new MySqlConnection(connectString))
{
MySqlTransaction sqlTransaction = null;
try
{
if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
sqlTransaction = connection.BeginTransaction();
var dt = ListToDataTable<T>(data); //将List转成dataTable
string tmpPath = Path.GetTempFileName();
dt.ToCsv(tmpPath); //将DataTable转成CSV文件
var insertCount = MySqlHelper.BulkLoad(connection, dt, tmpPath); //使用MySqlBulkLoader插入数据
sqlTransaction.Commit();
try
{
if (File.Exists(tmpPath)) File.Delete(tmpPath);
}
catch (Exception)
{
//删除文件失败
}
return insertCount; //返回执行成功的条数
}
catch (Exception e)
{
if (sqlTransaction != null)
{
sqlTransaction.Rollback();
}
//执行异常
throw e;
}
}
}
/// <summary>
/// 将List转化为DataTable核心方法
/// </summary>
/// <returns></returns>
public DataTable ListToDataTable<T>(List<T> data)
{
#region 创建一个DataTable，以实体名称作为DataTable名称
var tableName = typeof(T).Name;
tableName = tableName.ToSnakeCase(); /*实体名称与表名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
DataTable dt = new DataTable
{
TableName = tableName
};
#endregion
#region 拿取列名，以实体的属性名作为列名
var properties = typeof(T).GetProperties();
foreach (var item in properties)
{
var curFileName = item.Name;
curFileName = curFileName.ToSnakeCase();/*列名与字段名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
dt.Columns.Add(curFileName);
}
#endregion
#region 列赋值
foreach (var item in data)
{
DataRow dr = dt.NewRow();
var columns = dt.Columns;
var curPropertyList = item.GetType().GetProperties();
foreach (var p in curPropertyList)
{
var name = p.Name;
name = name.ToSnakeCase();/*列名与字段名进行转化，主要根据各项目的规定进行转化,不一定就是我这些写的这种转换方式*/
var curValue = p.GetValue(item);
int i = columns.IndexOf(name);
dr[i] = curValue;
}
dt.Rows.Add(dr);
}
#endregion
return dt;
}
}
/// <summary>
/// 批量导入mysql帮助类
/// </summary>
public static class MySqlHelper
{
/// <summary>
/// MySqlBulkLoader批量导入
/// </summary>
/// <param name="_mySqlConnection">数据库连接地址</param>
/// <param name="table"></param>
/// <param name="csvName"></param>
/// <returns></returns>
public static int BulkLoad(MySqlConnection _mySqlConnection, DataTable table, string csvName)
{
var columns = table.Columns.Cast<DataColumn>().Select(colum => colum.ColumnName).ToList();
MySqlBulkLoader bulk = new MySqlBulkLoader(_mySqlConnection)
{
FieldTerminator = "\t",
FieldQuotationCharacter = '"',
EscapeCharacter = '"',
LineTerminator = "\r\n",
FileName = csvName,
NumberOfLinesToSkip = 0,
TableName = table.TableName,
};
bulk.Columns.AddRange(columns);
return bulk.Load();
}
}
/// <summary>
/// csv扩展
/// </summary>
public static class CSVEx
{
/// <summary>
///将DataTable转换为标准的CSV文件
/// </summary>
/// <param name="table">数据表</param>
/// <param name="tmpPath">文件地址</param>
/// <returns>返回标准的CSV</returns>
public static void ToCsv(this DataTable table, string tmpPath)
{
//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++)
{
Type _datatype = typeof(DateTime);
colum = table.Columns[i];
if (i != 0) sb.Append("\t");
//if (colum.DataType == typeof(string) && row[colum].ToString().Contains(","))
//{
// sb.Append("\"" + row[colum].ToString().Replace("\"", "\"\"") + "\"");
//}
if (colum.DataType == _datatype)
{
sb.Append(((DateTime)row[colum]).ToString("yyyy/MM/dd HH:mm:ss"));
}
else sb.Append(row[colum].ToString());
}
sb.Append("\r\n");
}
StreamWriter sw = new StreamWriter(tmpPath, false, UTF8Encoding.UTF8);
sw.Write(sb.ToString());
sw.Close();
}
}
/// <summary>
/// 字符串转化
/// </summary>
public static class StringExtensions
{
/// <summary>
/// 转换为 main_keys_id 这种形式的字符串方式
/// </summary>
public static string ToSnakeCase(this string input)
{
if (string.IsNullOrEmpty(input)) { return input; }
var startUnderscores = Regex.Match(input, @"^_+");
return startUnderscores + Regex.Replace(input, @"([a-z0-9])([A-Z])", "$1_$2").ToLower();
}
}
/// <summary>
/// 实体
/// </summary>
public class CrmCouponTestDto
{
/// <summary>
/// ID
/// </summary>
public long Id { get; set; }
/// <summary>
/// 卡券号
/// </summary>
public string CouponCode { get; set; }
/// <summary>
/// 卡券ID
/// </summary>
public int CouponId { get; set; }
/// <summary>
/// 会员ID
/// </summary>
public int MemberId { get; set; }
/// <summary>
/// 发放时间
/// </summary>
public DateTime IssueTime { get; set; }
/// <summary>
/// 使用时间
/// </summary>
public DateTime UsageTime { get; set; }
/// <summary>
/// 使用店铺ID
/// </summary>
public int UsageShopId { get; set; }
/// <summary>
/// 使用单号
/// </summary>
public string UsageBillNo { get; set; }
/// <summary>
/// 有效开始时间
/// </summary>
public DateTime EffectiveStart { get; set; }
/// <summary>
/// 有效结束时间
/// </summary>
public DateTime EffectiveEnd { get; set; }
/// <summary>
/// 状态
/// CouponStatus 卡券状态:
/// -1：未领用
/// 0：未使用
/// 1：已使用
/// 2：已过期
///3：已作废
///4：转赠中
/// </summary>
public Int16 Status { get; set; }
}
}到此，关于“如何利用MySqlBulkLoader实现批量插入数据”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
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