SQL Server数据到SQLite数据库

Question

我有一个SQL Server表，包含大约20000多行数据，同样我必须插入到运行时创建的sqlite数据库中。请建议哪种方法是导入数据的最佳方法？

我有两组代码：

DataTable table = new DataTable();

using (var con = new SqlConnection(classlayer.SQLconnectionstring))
using (var cmd = new SqlCommand(spname, con))
using (var da = new SqlDataAdapter(cmd))
{
    da.AcceptChangesDuringFill = false;
    cmd.CommandType = CommandType.StoredProcedure;
    da.Fill(table);
}

string qry = "Select * from " + tablename;
var sqliteAdapter = new SQLiteDataAdapter(qry, sqlitecon);
var cmdBuilder = new SQLiteCommandBuilder(sqliteAdapter);
sqliteAdapter.Update(table);

或者这个

string MyConString = "SERVER=SERVER;DATABASE=mydb;User ID=sa;Password=password;";
string query = "";

SqlConnection connection = new SqlConnection(MyConString);
SqlCommand command = new SqlCommand("select Code,Name,route from Localities", connection);

SqlDataReader Reader;

SQLiteConnection conn = new SQLiteConnection("Data Source=W:\\Localities.db;Version=3;");

connection.Open();
conn.Open();

Reader = command.ExecuteReader();
int i = 0;

while (Reader.Read())
{
    query = "Insert into Localities(Code,Name,route) values('" + Reader.GetValue(0).ToString() + "','" + Reader.GetValue(1).ToString() + "','" + Reader.GetValue(2).ToString()  + "')";
    SQLiteCommand cmd = new SQLiteCommand(query, conn);
    i = i + cmd.ExecuteNonQuery();
}