應用VisualBasic中TextFieldParser解析器把CSV格式倒入數據庫。本站提示廣大學習愛好者：（應用VisualBasic中TextFieldParser解析器把CSV格式倒入數據庫）文章只能為提供參考，不一定能成為您想要的結果。以下是應用VisualBasic中TextFieldParser解析器把CSV格式倒入數據庫正文
寫了個Demo，應用Microsoft.VisualBasic這個順序集中的TextFieldParser解析器解析CSV格式的文件，然後將解析的數據拔出到相關表，這樣的益處是不必去用令人頭疼的ODBC去操作CSV格式文件，如之前是這樣去操作:
string strConnString = "Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=" + this.dirCSV.Trim() + ";Extensions=asc,csv,tab,txt;Persist Security Info=False";
string sql_select;
OdbcConnection conn;
conn = new OdbcConnection(strConnString.Trim());
conn.Open();
OdbcCommand commandRowCount = new OdbcCommand("SELECT COUNT(*) FROM [" + this.FileNevCSV.Trim() + "]", conn);
this.rowCount = System.Convert.ToInt32(commandRowCount.ExecuteScalar());
sql_select = "select * from [" + this.FileNevCSV.Trim() + "]";
OdbcCommand commandSourceData = new OdbcCommand(sql_select, conn);
OdbcDataReader dataReader = commandSourceData.ExecuteReader();
DataTable dt;
dt = dataReader.GetSchemaTable();
前往欄目頁：
namespace ImportCSV
{
class Program
{
//銜接字符串
private static readonly string connStr = @"Data Source=BEAR\EYESSQLSERVER;Initial Catalog=Test;Integrated Security=True";
//標明，最好做成是客配置，如Winform順序下拉框
private static string tableName = "Customer";
/// <summary>
/// 執行查詢，前往DataTable數據源
/// </summary>
/// <param name="connStr"></param>
/// <param name="cmdText"></param>
/// <param name="parameters"></param>
/// <returns></returns>
static DataTable ExecuteDataTable(string connStr,string cmdText,params SqlParameter[] parameters)
{
using (SqlConnection conn=new SqlConnection(connStr))
{
using (SqlCommand cmd=conn.CreateCommand())
{
cmd.CommandText = cmdText;
cmd.Parameters.AddRange(parameters);
using (SqlDataAdapter adapter=new SqlDataAdapter(cmd))
{
DataTable dataTable=new DataTable();
adapter.Fill(dataTable);
return dataTable;
}
}
}
}
/// <summary>
/// 失掉主鍵列
/// </summary>
/// <returns></returns>
static List<string> GetKeyWords()
{
//SQL Server 零碎試圖失掉主鍵列
string sql = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME=@TABLE_NAME";
DataTable dt=ExecuteDataTable(connStr, sql, new SqlParameter("TABLE_NAME", tableName));
List<string> listKeyWords=new List<string>();
foreach (DataRow row in dt.Rows)
{
string keyWord = Convert.ToString(row["COLUMN_NAME"]);
listKeyWords.Add(keyWord);
}
return listKeyWords;
}
/// <summary>
/// 失掉指定表一切的列
/// </summary>
/// <returns></returns>
static List<string> GetAllColumns()
{
//零碎視圖失掉一切列
string sql = "select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME=@TABLE_NAME";
DataTable dt = ExecuteDataTable(connStr, sql, new SqlParameter("TABLE_NAME", tableName));
List<string> listCols = new List<string>();
foreach (DataRow row in dt.Rows)
{
string columnName = Convert.ToString(row["COLUMN_NAME"]);
listCols.Add(columnName);
}
return listCols;
}
/// <summary>
/// 失掉初主鍵外一切列
/// </summary>
/// <returns></returns>
static List<string> GetAllColumnsWithoutKeyWords()
{
List<string> listAllColumns = GetAllColumns();
List<string> listKeyWords= GetKeyWords();
return listAllColumns.Except(listKeyWords).ToList();
}
/// <summary>
/// 失掉除Identity（標識）外一切列
/// </summary>
/// <returns></returns>
static List<string> GetAllColumnsWithoutIdentity()
{
//失掉Identity標志列
string sql = @"select COLUMN_NAME
from INFORMATION_SCHEMA.COLUMNS
where TABLE_SCHEMA = 'dbo'
and COLUMNPROPERTY(object_id(TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1
and TABLE_NAME=@TABLE_NAME";
DataTable dt = ExecuteDataTable(connStr, sql, new SqlParameter("TABLE_NAME", tableName));
List<string> listColumnsWithoutIdentity = new List<string>();
foreach (DataRow row in dt.Rows)
{
listColumnsWithoutIdentity.Add(Convert.ToString(row["COLUMN_NAME"]));
}
List<string> listAllColumns = GetAllColumns();
//從一切列中掃除
return listAllColumns.Except(listColumnsWithoutIdentity).ToList();
}
static void Main(string[] args)
{
using (SqlConnection connection = new SqlConnection(connStr))
{
using (SqlCommand cmd = connection.CreateCommand())
{
//失掉一切列除Identity標志列
string[] columnsWithoutIdentity = GetAllColumnsWithoutIdentity().ToArray();
//SQL參數
string[] columnsParameters = (from c in columnsWithoutIdentity select "@" + c).ToArray();
StringBuilder sb=new StringBuilder();
//拼接Insert SQL語句
sb.AppendLine("insert into " + tableName + "(" + string.Join(",", columnsWithoutIdentity) +
") output inserted.id values(" + string.Join(",",columnsParameters)+ ")");
cmd.CommandText = sb.ToString();
//從途徑失掉csv的文件，可以做成翻開框
using (var myCsvFile = new TextFieldParser(@"C:\Users\eyeswang\Desktop\xxxx.csv",Encoding.Default))
{
myCsvFile.TextFieldType = FieldType.Delimited;
myCsvFile.SetDelimiters(",");//設置解析器聯系符
connection.Open();
//循環，一行一行讀
while (!myCsvFile.EndOfData)
{
string[] fieldArray;
try
{
//讀取一行
fieldArray = myCsvFile.ReadFields();
for (int i = 0; i < fieldArray.Count(); i++)
{
//給參數賦值，假如是NULL，則DBNULL.Value拔出相關列
cmd.Parameters.Add("@" + columnsWithoutIdentity[i], fieldArray[i].ToUpper() == "NULL" ? (object)DBNull.Value : fieldArray[i]);
}
//執行終了後記得Parameters Clear
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
catch (Microsoft.VisualBasic.FileIO.MalformedLineException ex)
{
continue;
}
}
}
}
}
Console.WriteLine("OK");
Console.ReadKey();
}
}
}
作者：cnblogs 木宛城主
