将数据插入SQLite数据库，数据类型不匹配
我想使用SQLite将数据插入数据库，但我没有做到。 我按下我创建的按钮进行输入，但数据无法发送到数据库。 我已经阅读了LogCat，它说数据类型不匹配，我不知道它意味着哪种数据类型。
这是我的代码：
database.java
public class database { public static final String MOVIE_NAME = "mName"; private static final String DATABASE_NAME = "Movie"; private static final String DATABASE_TABLE = "mList"; private static final int DATABASE_VERSION = 1; private Database db; private final Context cont; private SQLiteDatabase moviedatabase; public static class Database extends SQLiteOpenHelper{ public Database(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); // TODO Auto-generated constructor stub } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + MOVIE_NAME + " TEXT NOT NULL);" ); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME); } } public database(Context con){ cont = con; } public database open() throws Exception{ db = new Database(cont); moviedatabase = db.getWritableDatabase(); return this; } public void close(){ db.close(); } public void createEntry(String input) { // TODO Auto-generated method stub ContentValues content = new ContentValues(); content.put(MOVIE_NAME, input); moviedatabase.insert(DATABASE_TABLE, null, content); } public String getData() { // TODO Auto-generated method stub String[] col = new String[]{MOVIE_NAME}; Cursor curs = moviedatabase.query(DATABASE_TABLE, col, null, null, null, null, null); String res = ""; int rowNum = curs.getColumnIndex(MOVIE_NAME); for(curs.moveToFirst(); !curs.isAfterLast(); curs.moveToNext()){ res = res + curs.getString(rowNum) + "\n"; } return res; } insert.java
public class insert extends Activity{ Button insBtn; EditText insET; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.insert); insET = (EditText) findViewById(R.id.insertET); insBtn = (Button) findViewById(R.id.insertBtn); insBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub try{ String input = insET.getText().toString(); database newEntry = new database(insert.this); newEntry.open(); newEntry.createEntry(input); newEntry.close(); }catch(Exception e){ e.printStackTrace(); } } }); }
list.java
public class list extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.list); TextView d = (TextView) findViewById(R.id.movieName); database movies = new database(this); try{ movies.open(); String data = movies.getData(); movies.close(); d.setText(data); }catch(Exception e){ e.printStackTrace(); } } }
logcat的：
03-16 07:28:17.617: E/SQLiteLog(3194): (20) statement aborts at 6: [INSERT INTO mList(mName) VALUES (?)] datatype mismatch 03-16 07:28:17.635: E/SQLiteDatabase(3194): Error inserting mName=dfsefsd 03-16 07:28:17.635: E/SQLiteDatabase(3194): android.database.sqlite.SQLiteDatatypeMismatchException: datatype mismatch (code 20) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at com.example.project.database.createEntry(database.java:63) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at com.example.project.insert$1.onClick(insert.java:34) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.view.View.performClick(View.java:4204) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.view.View$PerformClick.run(View.java:17355) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.os.Handler.handleCallback(Handler.java:725) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.os.Handler.dispatchMessage(Handler.java:92) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.os.Looper.loop(Looper.java:137) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at android.app.ActivityThread.main(ActivityThread.java:5041) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at java.lang.reflect.Method.invokeNative(Native Method) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at java.lang.reflect.Method.invoke(Method.java:511) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 03-16 07:28:17.635: E/SQLiteDatabase(3194): at dalvik.system.NativeStart.main(Native Method) 03-16 07:28:26.418: I/Choreographer(3194): Skipped 33 frames! The application may be doing too much work on its main thread.
首先开始更改代码
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME);
至
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
很有可能这解释了数据类型错误。