我在这里看到了一些处理相同问题的其他线程，但没有一个有帮助。
我正在尝试显示数据库的内容，但每当我尝试运行我的应用程序时，我都会收到错误：
06-21 16:25:51.723 2241-2241/net.learn2develop.Databases I/art﹕ Not late-enabling -Xcheck:jni (already on)
06-21 16:25:51.811 2241-2241/net.learn2develop.Databases D/++++﹕ Here
06-21 16:25:51.811 2241-2241/net.learn2develop.Databases E/SQLiteLog﹕ (1) no such table: pokemon
06-21 16:25:51.811 2241-2241/net.learn2develop.Databases D/AndroidRuntime﹕ Shutting down VM
--------- beginning of crash
06-21 16:25:51.812 2241-2241/net.learn2develop.Databases E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: net.learn2develop.Databases, PID: 2241
java.lang.RuntimeException: Unable to start activity ComponentInfo{net.learn2develop.Databases/net.learn2develop.Databases.DatabasesActivity}: android.database.sqlite.SQLiteException: no such table: pokemon (code 1): , while compiling: SELECT _id, name, type, 0 FROM pokemon
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.database.sqlite.SQLiteException: no such table: pokemon (code 1): , while compiling: SELECT _id, name, type, 0 FROM pokemon
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at net.learn2develop.Databases.DBAdapter.getAllContacts(DBAdapter.java:98)
at net.learn2develop.Databases.DatabasesActivity.onCreate(DatabasesActivity.java:48)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
这是我的代码：数据库活动
package net.learn2develop.Databases;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
public class DatabasesActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DBAdapter db = new DBAdapter(this);
try {
String destPath = "/data/data/" + getPackageName() +
"/databases";
File f = new File(destPath);
if (!f.exists()) {
f.mkdirs();
f.createNewFile();
//---copy the db from the assets folder into
// the databases folder---
CopyDB(getBaseContext().getAssets().open("pokemon"),
new FileOutputStream(destPath + "/PokemonList"));
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//---get all contacts---
db.open();
Log.d("++++", "Here");
Cursor c = db.getAllContacts();
ListView lvItems = (ListView) findViewById(R.id.lvItems);
ContactCursorAdapter contactAdapter = new ContactCursorAdapter(this, c);
lvItems.setAdapter(contactAdapter);
db.close();
}
public void CopyDB(InputStream inputStream,
OutputStream outputStream) throws IOException {
//---copy 1K bytes at a time---
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
inputStream.close();
outputStream.close();
}
}
联系光标适配器
package net.learn2develop.Databases;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;
public class ContactCursorAdapter extends CursorAdapter {
public ContactCursorAdapter (Context context, Cursor cursor) {
super(context, cursor, 0);
}
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return LayoutInflater.from(context).inflate(R.layout.lvuser, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView tvPokemon = (TextView) view.findViewById(R.id.tvPokemon);
TextView tvType = (TextView) view.findViewById(R.id.tvType);
TextView tvGen = (TextView) view.findViewById(R.id.tvGen);
String name = cursor.getString(cursor.getColumnIndexOrThrow("pokemon"));
String type = cursor.getString(cursor.getColumnIndexOrThrow("type"));
int gen = cursor.getInt(cursor.getColumnIndexOrThrow("generation"));
tvPokemon.setText(name);
tvType.setText(type);
tvGen.setInputType(gen);
}
}
将对DBAdapter
package net.learn2develop.Databases;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import java.security.Key;
public class DBAdapter {
static final String KEY_ROWID = "_id";
static final String KEY_POKEMON = "name";
static final String KEY_TYPE = "type";
static final int KEY_GEN = 0;
static final String TAG = "DBAdapter";
static final String DATABASE_NAME = "PokemonList";
static final String DATABASE_TABLE = "pokemon";
static final int DATABASE_VERSION = 3;
static final String DATABASE_CREATE =
"CREATE TABLE pokemon (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT,"
+ " type TEXT, gen INTEGER)";
final Context context;
DatabaseHelper DBHelper;
SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL(DATABASE_CREATE);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
}
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a contact into the database---
public long insertContact(String name, String type, int num)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_POKEMON, name);
initialValues.put(KEY_TYPE, type);
initialValues.put(String.valueOf(KEY_GEN), num);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//---deletes a particular contact---
public boolean deleteContact(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
//---retrieves all the contacts---
public Cursor getAllContacts()
{
return db.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_POKEMON,
KEY_TYPE, String.valueOf(KEY_GEN)}, null, null, null, null, null);
}
//---retrieves a particular contact---
public Cursor getContact(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_POKEMON, KEY_TYPE, String.valueOf(KEY_GEN)}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//---updates a contact---
public boolean updateContact(long rowId, String name, int num, String type)
{
ContentValues args = new ContentValues();
args.put(KEY_POKEMON, name);
args.put(KEY_TYPE, type);
args.put(String.valueOf(KEY_GEN), num);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
以下是DB Browser for SQLite
的create语句的副本CREATE TABLE "pokemon" (
`_id` INTEGER PRIMARY KEY AUTOINCREMENT,
`name` TEXT,
`type` TEXT,
`gen` INTEGER
)
我的项目的assets文件夹中有sqlite数据库文件。
我不确定我是否错误地执行了DATABASE_CREATE语句，我的实际数据库文件设置不正确，或者我忽略了其他内容。
答案 0 :(得分：0)
问题在于你没有使用引号＆＃34;＆＃34;
尝试做这样的事情
private static final String DATABASE_CREATE = "create table "
+ TABLE_MOVIE
+ COLUMN_ID + " integer primary key autoincrement, "
+ COLUMN_LAST_BUILD_DATE + " varchar(50) not null, "
+ COLUMN_TITLE + " varchar(100) not null, "
+ COLUMN_LINK + " varchar(100) not null, "
+ COLUMN_DESCRIPTION + " varchar(1000) not null, "
+ COLUMN_PUBDATE + " varchar(50) not null "
+ ");";