如何将表中的所有行获取到android应用
[英]How to get all rows from a table to an android app
问题描述
my problem is i can't get all rows in a table to my android app my table is in a ms sql database and i want to get all the columns into a textview when i try to get them it only gets the first row in my table any help? 
我的问题是我无法将表中的所有行都发送到我的android应用程序中，我的表在ms sql数据库中，并且当我尝试获取所有列时，我想将所有列都输入到textview中，因此它只能获取我的第一行表有什么帮助吗？
here is my code: 这是我的代码：
public class words extends AppCompatActivity {
private Button a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,rr,s,t,u,v,w,x,y,z,z1,z2;
ConnectionClass connectionClass;
ProgressBar loading;
private TextView view;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_words);
getSupportActionBar().hide();
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
a = (Button) findViewById(R.id.أ);
b = (Button) findViewById(R.id.ب);
c = (Button) findViewById(R.id.ت);
d = (Button) findViewById(R.id.ث);
e = (Button) findViewById(R.id.button3);
f = (Button) findViewById(R.id.button13);
g = (Button) findViewById(R.id.button17);
h = (Button) findViewById(R.id.button6);
i = (Button) findViewById(R.id.button8);
j = (Button) findViewById(R.id.button18);
k = (Button) findViewById(R.id.button19);
l = (Button) findViewById(R.id.button21);
m = (Button) findViewById(R.id.button26);
n = (Button) findViewById(R.id.button22);
o = (Button) findViewById(R.id.button23);
p = (Button) findViewById(R.id.button24);
q = (Button) findViewById(R.id.button20);
rr = (Button) findViewById(R.id.button27);
s = (Button) findViewById(R.id.button29);
t = (Button) findViewById(R.id.button28);
u = (Button) findViewById(R.id.button31);
v = (Button) findViewById(R.id.button30);
w = (Button) findViewById(R.id.button32);
x = (Button) findViewById(R.id.button33);
y = (Button) findViewById(R.id.button34);
z = (Button) findViewById(R.id.button35);
z1 = (Button) findViewById(R.id.button36);
z2 = (Button) findViewById(R.id.button37);
loading = (ProgressBar) findViewById(R.id.progressBar);
connectionClass = new ConnectionClass();
view = (TextView) findViewById(R.id.word);
DoLogin doLogin = new DoLogin(); // this is the Asynctask
doLogin.execute("");
}
public class DoLogin extends AsyncTask<String,String,String>
{
String message = "";
Boolean isSuccess = false;
@Override
protected void onPreExecute() {
loading.setVisibility(View.VISIBLE);
}
@Override
protected void onPostExecute(String r) {
loading.setVisibility(View.GONE);
Toast.makeText(words.this, r, Toast.LENGTH_SHORT).show();
if(isSuccess) {
Toast.makeText(words.this, r, Toast.LENGTH_SHORT).show();
}
}
@Override
protected String doInBackground(String... params) {
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Connection con = connectionClass.CONN();
if (con == null) {
message = "Error in connection with SQL server please contact the administrator";
} else {
String query = "SELECT * FROM country INNER JOIN family ON country.CID = family.CID";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
if(rs.next())
{
try {
String theword = (rs.getString("FName"));
if (theword.contains("أ")){
a.setVisibility(View.VISIBLE);
}else if (theword.contains("ب")){
b.setVisibility(View.VISIBLE);
}else if (theword.contains("ت")){
c.setVisibility(View.VISIBLE);
}else if (theword.contains("ث")){
d.setVisibility(View.VISIBLE);
}else if (theword.contains("ج")){
e.setVisibility(View.VISIBLE);
} else if (theword.contains("ح")){
f.setVisibility(View.VISIBLE);
}else if (theword.contains("خ")){
g.setVisibility(View.VISIBLE);
}else if (theword.contains("د")){
h.setVisibility(View.VISIBLE);
}else if (theword.contains("ذ")){
i.setVisibility(View.VISIBLE);
}else if (theword.contains("ر")){
j.setVisibility(View.VISIBLE);
}else if (theword.contains("ز")){
k.setVisibility(View.VISIBLE);
}else if (theword.contains("س")){
l.setVisibility(View.VISIBLE);
}else if (theword.contains("ش")){
m.setVisibility(View.VISIBLE);
}else if (theword.contains("ص")){
n.setVisibility(View.VISIBLE);
}else if (theword.contains("ض")){
o.setVisibility(View.VISIBLE);
}else if (theword.contains("ط")){
p.setVisibility(View.VISIBLE);
}else if (theword.contains("ظ")){
q.setVisibility(View.VISIBLE);
}else if (theword.contains("ع")){
rr.setVisibility(View.VISIBLE);
}else if (theword.contains("غ")){
s.setVisibility(View.VISIBLE);
}else if (theword.contains("ف")){
t.setVisibility(View.VISIBLE);
}else if (theword.contains("ق")){
u.setVisibility(View.VISIBLE);
}else if (theword.contains("ك")){
v.setVisibility(View.VISIBLE);
}else if (theword.contains("ل")){
w.setVisibility(View.VISIBLE);
}else if (theword.contains("م")){
x.setVisibility(View.VISIBLE);
}else if (theword.contains("ن")){
y.setVisibility(View.VISIBLE);
}else if (theword.contains("ه")){
z.setVisibility(View.VISIBLE);
}else if (theword.contains("و")){
z1.setVisibility(View.VISIBLE);
}else if (theword.contains("ي")){
z2.setVisibility(View.VISIBLE);
}else {
message ="WERE IS THE FWORD COLUMN?!?!";
}
isSuccess=true;
}catch (Exception e){
message = "Exception e = "+e;
isSuccess = false;
}
}
}
}
catch (Exception ex)
{
isSuccess = false;
message = "Exceptions"+ex;
}
}
});
return message;
}
}
}
with this code it always give me in my text view only one row 使用此代码，它总是在我的文本视图中仅给我一行
any help?! 有帮助吗？
EDIT: 编辑：
THE QUERY RETURNS ALL ROWS SUCCESSFULLY BUT IT DOESN'T DO THE SAME THING IN THE APP 查询将成功返回所有行，但在应用程序中未执行相同的操作
SOLVED 解决了
I replaced if(rs.next()) with while(rs.next()) and it solved my problem! 我用while（rs.next（））替换了if（rs.next（）），它解决了我的问题！
2 个解决方案
解决方案1
0 2019-08-06 01:49:38
First ensure your query is returning more than 1 row, execute it using any tool for that, 首先，请确保您的查询返回的行多于1行，为此使用任何工具执行查询，
SELECT column_name
FROM country
INNER JOIN family
ON country.CID = family.CID
If not, the issue comes with your INNER JOIN and change it to LEFT JOIN to return even the null values if that the case. 如果不是这样，则问题与您的INNER JOIN ，并将其更改为LEFT JOIN以在这种情况下甚至返回空值。
Select the column_name directly to avoid retrieve all columns you are not using. 直接选择column_name以避免检索未使用的所有列。
解决方案2
0 2019-08-06 01:49:39
There can be two possibilities for your issue, 您的问题可能有两种可能性，
Your selection query
"SELECT * FROM country INNER JOIN family ON country.CID = family.CID"might be returning just a single row, verify that it returns all the required rows.您的选择查询"SELECT * FROM country INNER JOIN family ON country.CID = family.CID"可能仅返回一行，请确认它返回了所有必需的行。 To verify that the total number of rows are available, you can attach a break-point at this lineResultSet rs = stmt.executeQuery(query);要验证总行数可用，您可以在此行上附加一个断点ResultSet rs = stmt.executeQuery(query);and evaluate the left-hand side of the statement.并评估该语句的左侧。 Even if assumed, that your selection query is working fine and returning all the expected rows.
即使假设您的选择查询运行正常，并返回所有预期的行。 You need to iterate over the results( as suggested by @Psycho ) to fetch all rows from your query results. 您需要遍历结果（如@Psycho所建议），以从查询结果中获取所有行。
As the docs say: 正如文档所说：
A ResultSet object maintains a cursor pointing to its current row of data.
So what you can do is this, 所以你可以做的是
if(rs.first()) //move the cusor to first position
{
do{
try {
String theword = (rs.getString("FName"));
if (theword.contains("أ")){
a.setVisibility(View.VISIBLE);
}else if (theword.contains("ب")){
b.setVisibility(View.VISIBLE);
}else if (theword.contains("ت")){
c.setVisibility(View.VISIBLE);
}else if (theword.contains("ث")){
d.setVisibility(View.VISIBLE);
}else if (theword.contains("ج")){
e.setVisibility(View.VISIBLE);
} else if (theword.contains("ح")){
f.setVisibility(View.VISIBLE);
}else if (theword.contains("خ")){
g.setVisibility(View.VISIBLE);
}else if (theword.contains("د")){
h.setVisibility(View.VISIBLE);
}else if (theword.contains("ذ")){
i.setVisibility(View.VISIBLE);
}else if (theword.contains("ر")){
j.setVisibility(View.VISIBLE);
}else if (theword.contains("ز")){
k.setVisibility(View.VISIBLE);
}else if (theword.contains("س")){
l.setVisibility(View.VISIBLE);
}else if (theword.contains("ش")){
m.setVisibility(View.VISIBLE);
}else if (theword.contains("ص")){
n.setVisibility(View.VISIBLE);
}else if (theword.contains("ض")){
o.setVisibility(View.VISIBLE);
}else if (theword.contains("ط")){
p.setVisibility(View.VISIBLE);
}else if (theword.contains("ظ")){
q.setVisibility(View.VISIBLE);
}else if (theword.contains("ع")){
rr.setVisibility(View.VISIBLE);
}else if (theword.contains("غ")){
s.setVisibility(View.VISIBLE);
}else if (theword.contains("ف")){
t.setVisibility(View.VISIBLE);
}else if (theword.contains("ق")){
u.setVisibility(View.VISIBLE);
}else if (theword.contains("ك")){
v.setVisibility(View.VISIBLE);
}else if (theword.contains("ل")){
w.setVisibility(View.VISIBLE);
}else if (theword.contains("م")){
x.setVisibility(View.VISIBLE);
}else if (theword.contains("ن")){
y.setVisibility(View.VISIBLE);
}else if (theword.contains("ه")){
z.setVisibility(View.VISIBLE);
}else if (theword.contains("و")){
z1.setVisibility(View.VISIBLE);
}else if (theword.contains("ي")){
z2.setVisibility(View.VISIBLE);
}else {
message ="WERE IS THE FWORD COLUMN?!?!";
}
isSuccess=true;
}catch (Exception e){
message = "Exception e = "+e;
isSuccess = false;
}
} while(rs.next()); //iterate till the next row is available
}
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