小编UPG*_*EDD的帖子

我正在尝试打印我的应用程序通过FileWriter保存的.txt文件.

它保存的文件是/sdcard/StudentLatePass.txt

单击打印按钮时,将保存SD文件,然后需要打印.我一直在关注谷歌云打印教程.

package com.android.upgrayeddapps.latepass;



import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Button;
import android.widget.Toast;



public class StudentActivity extends Activity 
{
    EditText txtData;
    Button btnPrintTardy;

    public void onCreate(Bundle savedInstanceState) 
    {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.student);

        //Displays the Custom dialog for student login
        AlertDialog.Builder builder;
        AlertDialog alertDialog;

        Context mContext = this;
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE) ;
        View layout = inflater.inflate(R.layout.studentlogin, null); …

我试图用SQL结果填充组合框我想我的问题是处理数据表格式的数据.

    Dim sql As String
    Dim sqlquery As String
    Dim ConnectionString As String
    ConnectionString = "Data Source=(local);Initial Catalog=Control;Persist Security Info=True;User ID=user;Password=pass"
    sqlquery = "Select dbName from Databases"

    Using connection As SqlConnection = New SqlConnection(ConnectionString)
        connection.Open()
        Using conn As SqlCommand = New SqlCommand(sqlquery, conn)
            Dim rs As SqlDataReader = comm.ExecuteReader
            Dim dt As DataTable = New DataTable
            dt.Load(cmboxDatabaseName)
        End Using 'comm
    End Using 'conn

当我运行程序时,我只是盯着一个悲伤的空组合框.

我正在尝试用case语句编写查询.我在将case语句输出为多个变量时遇到问题.基本上我想取1列,然后将第一部分作为outputcolumn1"FIRST",将最后4个字符作为outputcolumn2"LAST"

我尝试做一些研究,但我没有找到任何解决我的味道...我知道我忽略了一些非常愚蠢的东西.

Select *
Case When a.col_1 is NULL 
-- Grab all but last 4 as "FIRST"
Then LEFT(b.col_1, len(b.col_1) -4
-- Grab Last 4 as "LAST"
AND RIGHT(b.col_1, 4)
Else LEFT(a.col_1, len(a.col_1) -4
AND RIGHT(a.col_1, 4)

end as FIRST,LAST

From Table_1 as a
inner join Table_2 as b on a.TableID = b.TableID