我想使用SQLite将数据插入数据库，但我没有这样做。我按下了我创建的按钮以输入，但数据无法发送到数据库。我已经阅读了LogCat，它说的是数据类型不匹配，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.
答案 0 :(得分：1)
首先从
开始更改代码db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME);
到
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
很有可能这解释了数据类型错误。