我正在使用SQLite数据库对应用程序运行一些测试。我在创建默认活动时调用open，然后testSuite（）方法在完成测试后将其关闭。但是，同一行不断给我一个错误，告诉我该对象已关闭，我正在尝试重新打开它。我不知道这种关闭可能发生在哪里，而且我是那些经常无法证明自己的代码的人之一。有谁介意我为什么会收到这个错误？
public class SQLTest extends Activity
{
public SQLAdapter adapter;
public int[] bb_count;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
bb_count = new int[21];
bb_count[0]++;
setContentView(R.layout.activity_sqltest);
adapter = new SQLAdapter(this);
adapter.createDatabase();
open();
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
bb_count[1]++;
getMenuInflater().inflate(R.menu.activity_sqltest, menu);
return true;
}
public SQLAdapter accessAdapter()
{
bb_count[2]++;
return adapter;
}
public void open()
{
bb_count[3]++;
adapter.open();
}
public void close()
{
bb_count[4]++;
adapter.close();
}
public long insert(String name, String field)
{
bb_count[5]++;
long id = adapter.insert(name, field);
return id;
}
public long insert(int id, String name, String field)
{
bb_count[5]++;
id = (int) adapter.insert(id, name, field);
return id;
}
public int delete(int id)
{
bb_count[7]++;
int rowsDeleted = adapter.delete(id);
return rowsDeleted;
}
public int update(int id, String name, String field)
{
bb_count[8]++;
int rowsUpdated = adapter.update(id, name, field);
return rowsUpdated;
}
public boolean get(Cursor cursor, int id)
{
bb_count[9]++;
try
{
bb_count[10]++;
cursor = adapter.get(id);
TextView tv = new TextView(this);
String table = "";
if (cursor.moveToFirst())
{
bb_count[11]++;
table += "\n" + cursor.getString(0) + " " + cursor.getString(1) + " " + cursor.getString(2);
}
else
{
bb_count[12]++;
table += "No hall found with ID: " + id;
return false;
}
tv.setText(table);
setContentView(tv);
} catch (Exception e) {
bb_count[13]++;
}
return true;
}
public boolean getAll(Cursor cursor)
{
bb_count[14]++;
try
{
bb_count[15]++;
TextView tv = new TextView(this);
String table = "";
try
{
bb_count[16]++;
cursor = adapter.getAll();
if (cursor.moveToFirst())
{
bb_count[17]++;
do
{
bb_count[18]++;
table += "\n" + cursor.getString(0) + " " + cursor.getString(1) + " " + cursor.getString(2);
} while (cursor.moveToNext());
}
} catch (Exception e) {
bb_count[19]++;
}
tv.setText(table);
setContentView(tv);
} catch (Exception e) {
bb_count[20]++;
return false;
}
return true;
}
public String blockCoverage()
{
String coverage = "";
for (int x = 0; x < bb_count.length; x++)
coverage += x + " " + bb_count[x] + "\n";
return coverage;
}
}
public class SQLSuiteVer2 extends ActivityInstrumentationTestCase2<SQLTest>
{
SQLTest activity;
public SQLSuiteVer2()
{
super(SQLTest.class);
}
protected void setUp() throws Exception
{
super.setUp();
setActivityInitialTouchMode(false);
activity = getActivity();
}
public void testPreConditions()
{
assertTrue(activity.accessAdapter() != null);
assertTrue(activity.accessAdapter().accessHelper().checkDatabase());
}
public void testSuite() throws IOException
{
int length = 100;
Cursor[] cursors = new Cursor[5];
for (int x = 0; x < 5; x++)
cursors[x] = activity.accessAdapter().getAll();
for (int x = 0; x < length; x++)
{
randomTest(cursors);
}
System.out.println( activity.blockCoverage()
+ activity.accessAdapter().accessHelper().blockCoverage());
for (int x = 0; x < 5; x++)
cursors[x].close();
activity.close();
}
public void testInsert(Cursor cursor, String name, String field)
{
int id = (int) activity.insert(name, field);
assert (activity.get(cursor, id));
}
public void testDelete(Cursor cursor, int id)
{
try
{
activity.delete(id);
assert (!activity.get(cursor, id));
} catch (Exception e) {
throw new Error("Row doesn't exist.");
}
}
public void testUpdate(int id, String name, String field)
{
Cursor cursor = activity.accessAdapter().get(id);
activity.update(id, name, field);
Cursor cursor2 = activity.accessAdapter().get(id);
assertTrue(!(cursor.equals(cursor2)));
}
public void testGet(Cursor cursor, int id)
{
assert activity.get(cursor, id);
}
public void testGetAll(Cursor cursor)
{
assert activity.getAll(cursor);
}
public void testJoin(Cursor cursor, Cursor cursor2)
{
String table = SQLAdapter.TABLE_OS;
String sql = "CREATE TABLE Blah"
+ "_id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "OrderNo. INTEGER NOT NULL, "
+ "Item TEXT NOT NULL)";
try
{
cursor = activity.accessAdapter().accessHelper().accessDatabase().rawQuery(sql, null);
} catch (Exception e) {
throw new Error("Could not make new 'Blah' table.");
}
sql = "SELECT * FROM " + table + " FULL JOIN Blah ON "
+ table + "._id=Blah._id";
try
{
cursor2 = activity.accessAdapter().accessHelper().accessDatabase().rawQuery(sql, null);
} catch (Exception e) {
throw new Error("Could not join 'Blah' and '" + table + "' tables.");
}
}
public void testJoinCopy(Cursor cursor, Cursor cursor2)
{
String table = SQLAdapter.TABLE_OS;
String sql = "SELECT * FROM " + table + " FULL JOIN " + table + "2 ON "
+ table + "._id=" + table + "2._id";
cursor = activity.accessAdapter().getAll();
try
{
cursor2 = activity.accessAdapter().accessHelper().accessDatabase().rawQuery(sql, null);
} catch (Exception e) {
throw new Error("Could not join '" + table +"' and its copy.");
}
}
public void testJoinUnrelated(Cursor cursor, Cursor cursor2)
{
String table = SQLAdapter.TABLE_OS;
String sql = "CREATE TABLE Blah2"
+ "Name TEXT PRIMARY KEY, "
+ "OrderNo. INTEGER NOT NULL, "
+ "Item TEXT NOT NULL)";
try
{
cursor = activity.accessAdapter().accessHelper().accessDatabase().rawQuery(sql, null);
} catch (Exception e) {
throw new Error("Could not make new 'Blah' table.");
}
sql = "SELECT * FROM " + table + " FULL JOIN Blah ON "
+ table + "._id=Blah._id";
try
{
cursor2 = activity.accessAdapter().accessHelper().accessDatabase().rawQuery(sql, null);
} catch (Exception e) {
throw new Error("Could not join two tables without a similar '_id'.");
}
}
public void testOverWrite(Random rand, String name, String field)
{
int id;
do
{
id = rand.nextInt();
} while (activity.accessAdapter().get(id) == null);
Cursor cursor = activity.accessAdapter().get(id);
activity.insert(id, name, field);
Cursor cursor2 = activity.accessAdapter().get(id);
assertTrue(!(cursor.equals(cursor2)));
}
@SuppressLint("NewApi")
public void randomTest(Cursor[] cursors)
{
String name = "", field = "";
Random rand = new Random();
int randOp = rand.nextInt(9);
int randName, randField, id;
Cursor cursor = activity.accessAdapter().getAll();
cursor.moveToFirst();
int start = Integer.parseInt(cursor.getString(0));
cursor.moveToLast();
int end = Integer.parseInt(cursor.getString(0));
int range = (end - start) + 1;
int cursorChoice = rand.nextInt(5);
int cursor2Choice = rand.nextInt(5);
switch (randOp)
{
case 0:
randName = rand.nextInt(45);
name = getRandomName(randName);
int nullNotNull = rand.nextInt(2);
switch (nullNotNull)
{
case 0:
field = null;
break;
case 1:
randField = rand.nextInt(24);
field = getRandomField(randField);
break;
}
testInsert(cursors[cursorChoice], name, field);
break;
case 1:
id = rand.nextInt(range)+start;
testDelete(cursors[cursorChoice], id);
break;
case 2:
int selection = rand.nextInt(5);
switch (selection)
{
case 0:
randName = rand.nextInt(45);
id = rand.nextInt(range)+start;
name = getRandomName(randName);
testUpdate(id, name, "");
break;
default:
randName = rand.nextInt(45);
name = getRandomName(randName);
randField = rand.nextInt(24);
field = getRandomField(randField);
id = rand.nextInt(range)+start;
testUpdate(id, name, field);
break;
}
break;
case 3:
id = rand.nextInt(range)+start;
testGet(cursors[cursorChoice], id);
break;
case 4:
testGetAll(cursors[cursorChoice]);
break;
case 5:
selection = rand.nextInt(5);
switch (selection)
{
case 0:
randName = rand.nextInt(45);
name = getRandomName(randName);
testOverWrite(rand, name, "");
break;
default:
randName = rand.nextInt(45);
name = getRandomName(randName);
randField = rand.nextInt(24);
field = getRandomField(randField);
testOverWrite(rand, name, field);
break;
}
break;
case 6:
testJoin(cursors[cursorChoice], cursors[cursor2Choice]);
break;
case 7:
testJoin(cursors[cursorChoice], cursors[cursor2Choice]);
break;
case 8:
testJoin(cursors[cursorChoice], cursors[cursor2Choice]);
break;
}
}
}
这是我收到错误的地方：
java.lang.Error: Could not make new 'Blah' table.
at com.example.sql2.test.SQLSuiteVer2.testJoin(SQLSuiteVer2.java:99)
at com.example.sql2.test.SQLSuiteVer2.randomTest(SQLSuiteVer2.java:410)
at com.example.sql2.test.SQLSuiteVer2.testSuite(SQLSuiteVer2.java:43)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)
一切正常，直到我添加了三个连接方法，一个覆盖了一个方法。
答案 0 :(得分：0)
您的问题提到重新打开已关闭对象错误。但是你的logcat显示了java.lang.Error异常。这是哪个错误？
如果使用logcat作为指南。也许这是你第二次运行测试，表'Blah'已经存在？您不能使用相同的名称创建两次相同的表。解决此问题的方法是从'setUp'方法中删除所有表。这样你的测试就从空数据库开始。或者，您可以将测试方法'testJoin'删除表'Blah'（如果已存在），并重新创建它。
答案 1 :(得分：0)
public SQLAdapter open() throws SQLException
{
try
{
helper.openDatabase();
helper.close();
database = helper.getWritableDatabase();
} catch (SQLException e) {
Log.e(TAG, " open >>" + e.toString());
throw e;
}
return this;
}
我认为这是问题的原因（帮助程序是我用来创建/复制和访问数据库的SQLiteOpenHelper的子类）。我删除了helper.close（）部分，因为我有一个已经在我的SQLAdapter类中执行此操作的方法，因此稍后当我完成工作时将调用helper.close（）方法。