我正在编写 C＃windows应用程序，我似乎无法弄清楚如何将数据从CSV文件插入数据库。
我有一个名为＆＃34; data.csv ＆＃34;的csv文件记录如下
Header 201501
id code amount
1 ab11 5000
2 ab11 6000
3 ab11 8000
3 wx34 2500
3 df21 1000
4 ab11 7000
4 zx54 3500
我必须将此数据提供给 sql表，如下所示
ab11 代表要支付的费用 并且任何其他代码代表学生支付的金额
第一张表tblStudents
id code amount
1 ab11 5000
2 ab11 6000
3 ab11 8000
4 ab11 7000
5 ab11 9000
第二个表格tblPaid
id code Paid Month
3 wx34 2500 201401
3 df21 1000 201401
4 zx54 3500 201401
基本上我要做的就是从 data.csv 文本文件中捕获这些数据，然后将其排序到一个表格，看起来像 tblStudents 和 tblPaid < /强>
对于 tblStudents 我必须把所有代码＆＃34; ab11＆＃34;并写入表格。
对于 tblPaid 我只需要编写没有＆＃34; ab11 ＆＃34;的代码的数据。并放入一个字段，用于读取 data.csv 文本文件中标题旁边的日期。
我正在考虑使用 BULK INSERT ，但标题不应该在表格中。
因此，我只能创建表并阅读 data.csv 文本文件，如下所示
//Open File Dialog to open csv file
//Only get csv files
openFileDialog1.Filter = ".csv file|*.csv*";
openFileDialog1.FilterIndex = 1;
DialogResult result = openFileDialog1.ShowDialog();
if (result == DialogResult.Yes)
{
String file = openFileDialog1.FileName;
//Read csv text file to get the month in the first line
using (var reader = new StreamReader(file))
{
string firstLine = reader.ReadLine();
string[] splitedLine = firstLine.Split(';');
string month = splitedLine[1];
}
try
{
//String with connection information of the database PSAHoldings
string connect = "Data Source=BRIAN-PC\\SQLEXPRESS; Initial Catalog=PSAHoldings; user id =sa; Password=kagiso";
//String Query to create t_original table if it does not exist already
string table = "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='t_original' AND xtype='U')" +
"CREATE TABLE t_original (" +
"empId varChar(10) NULL," +
"paycode varChar(10) NULL," +
"amount int NULL," +
")";
//String Query to create tblStudents table if it does not exist already
string tblStudents = "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='t_employee' AND xtype='U')" +
"CREATE TABLE t_employee (" +
"empId varChar(10) NOT NULL PRIMARY KEY," +
"paycode varChar(10) NULL," +
"amount int NULL," +
")";
//String Query to create tblPaid table if it does not exist already
string Paid = "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='t_deduction' AND xtype='U')" +
"CREATE TABLE t_deduction (" +
"empId varChar(10) NOT NULL PRIMARY KEY," +
"amount int NULL," +
"balance int NULL," +
")";
//String Query to create t_institutions table if it does not exist already
string t_institutions = "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='t_institutions' AND xtype='U')" +
"CREATE TABLE t_institutions (" +
"empId varChar(10) NOT NULL PRIMARY KEY," +
"paycode varChar(10) NOT NULL," +
"amount int NULL," +
")";
//Connecting to the server/database
SqlConnection con = new SqlConnection(connect);
con.Open();
//Create the tables
SqlCommand createTable = new SqlCommand(table, con);
SqlCommand createEmployee = new SqlCommand(t_employee, con);
SqlCommand createDeductions = new SqlCommand(t_deduction, con);
SqlCommand createInstitution = new SqlCommand(t_institutions, con);
createTable.ExecuteNonQuery();
createEmployee.ExecuteNonQuery();
createDeductions.ExecuteNonQuery();
createInstitution.ExecuteNonQuery();
//String Query to insert the text file into the t_original table
String BulkInsert = "BULK INSERT t_original FROM_" +
file + "_WITH (--FIRSTROW = 3," +
"FIELDTERMINATOR = ''," +
"MAXERRORS = 0," +
"ROWTERMINATOR = '\\n')";
//"UPDATE t_original"+
//"SET month =" + month +
//"WHERE month is null";
//insert the text file into the t_original table
SqlCommand bulkCmd = new SqlCommand(BulkInsert, con);
bulkCmd.ExecuteNonQuery();
}
//Catch exeption
catch (SqlException ex)
{
MessageBox.Show(ex.ToString(), "Exception Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
我已经写了BULK_INSERT，但无法在我的表格中找到任何内容
任何帮助都将受到赞赏，因为我是开发中的初学者
答案 0 :(得分：1)
首先，您只需要在数据库中创建一次表。因此，将创建它们的整个代码块移出循环。 其次，对于从csv中读取的每一行，您需要确定它是属于学生表还是付费表。这些方面的东西：
string[] DataArray = line.split(',');
if(DataArray.Length==3) // this is an actual data line
{
if(DataArray[1] == "ab11")
{
// student row
}
else
{
// Paid row
}
}
答案 1 :(得分：0)
我正在查看我的旧问题，只是看到我从未给你反馈。
我使用 public override bool FileToDatabase(string filePath)
{
SqlConnection sqlConnection = new SqlConnection(“Connerction string”);
try
{
StreamReader readFile = new StreamReader(filePath);
string[] sArr = ("LineNumber|" + readVoteFile.ReadLine()).Split('|');
int columnCount = 0;
foreach (string s in sArr)
{
columnCount++;
}
string line = null;
long counter = 0;
bool hasMoreRows = true;
DataTable FileDataTable = null;
while (hasMoreRows)
{
line = readFile.ReadLine();
if (line == null)
{
hasMoreRows = false;
}
else
{
if (hasMoreRows && FileDataTable == null)
{
FileDataTable = new DataTable();
for (int i = 0; i < columnCount; i++)
{
FileDataTable.Columns.Add(new DataColumn());
}
}
DataRow row = FileDataTable.NewRow();
row.ItemArray = (counter + "|" + line).Split('|');
FileDataTable.Rows.Add(row);
}
if (counter != 0 && counter % base.FileProcessBatchSize == 0 && hasMoreRows || !hasMoreRows && FileDataTable != null && FileDataTable.Rows.Count > 0)
{
sqlConnection.Open();
SqlBulkCopy bc = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.TableLock, null);
bc.BatchSize = base.DBInsertBatchSize;
bc.BulkCopyTimeout = 1200;
bc.DestinationTableName = base.BulkCopyTable;
bc.WriteToServer(FileDataTable);
bc.Close();
sqlConnection.Close();
FileDataTable = null;
}
counter++;
}
readFile.Close();
readFile.Dispose();
return true;
}
catch(Exception ex)
{
try { sqlConnection.Close(); }
catch { }
throw (ex);
}
}
在我的申请中这样做的部分写成如下：
http://感谢您的建议。