（Android）无法将数据插入SQLite数据库

Question

I tried a lot of fixes but still can not find out why the data can not be inserted.I used a tool called BD Browser for SQLite to check the data and there are tables and columns but no values..

Codes:

public class MainActivity extends Activity {
private Button btnadd,btnselect;
private EditText etmiles,etdate,etcosts,etprice;

SQLiteDatabase db;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btnadd=(Button)findViewById(R.id.add);
    btnselect=(Button)findViewById(R.id.select);
    etmiles=(EditText)findViewById(R.id.miles);
    etdate=(EditText)findViewById(R.id.date);
    etprice=(EditText)findViewById(R.id.price);
    etcosts=(EditText)findViewById(R.id.costs);
    db=SQLiteDatabase.openOrCreateDatabase(this.getFilesDir().toString() + "/my.db3", null);



    btnselect.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            Intent intent=new Intent(MainActivity.this,Activity02.class);
            startActivity(intent);

        }
    });
     btnadd.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {


        String amiles=etmiles.getText().toString();
        String sdate=etdate.getText().toString();
        String sprice=etprice.getText().toString();
        String acosts=etcosts.getText().toString();
        if(etmiles.getText().toString().length() == 0||etdate.getText().toString().length() == 0||etprice.getText().toString().length() == 0||etcosts.getText().toString().length() == 0)
        {
            Toast toast=Toast.makeText(MainActivity.this, "xxxx", Toast.LENGTH_SHORT);
            toast.show();
            return;
        }
        else
        {

            try{
                db.execSQL("insert into test1('" + sdate + "','" + amiles +  "','" + sprice + "','" + acosts +  "')");

                }
                catch(SQLiteException e)
                {
                    db.execSQL("create table if not exists test1(sdate varchar(40) primary key,amiles varchar(30),sprice varchar(30),acosts varchar(30))");
                }        
        Toast toast=Toast.makeText(MainActivity.this, "xxxx", Toast.LENGTH_SHORT);
        toast.show();
        }
        }
    });

}

}

Error message:near")":syntax error

Answer 1

It seems your INSERT statement doesn't match SQLite's syntax. Try adding VALUES like so:

INSERT INTO test1 VALUES (..., ..., ...)

And in truth on Android you should consider the insert() method instead.

Answer 2

you should use insert(String table, String nullColumnHack, ContentValues values)

where table is the name of the table you want to insert, nullColumnHack it is optional and can be null, and values is a map which contains the value we want to insert. The key of this map is the column name. Eg

ContentValues values = new ContentValues(); 
values.put(HISTORY_ORDER_ID_COL, orderId); 
values.put(HISTORY_PRODUCT_ID_COL, productId); 

long rowId = db.insert(TABLE_ORDER, null, values);

android will take care of writing the insert query for you.