DatabseHelper代码insertIncome是一个值得插入到此处的类是代码：public class DatabaseHelper extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 16;
//Database Name
private static final String DATABASE_NAME = "User.db";
//Table Created
private static final String TABLE_USER = "user";
//Columns in Table
private static final String COLUMN_ID = "id";
private static final String COLUMN_USERNAME = "username";
private static final String COLUMN_EMAIL = "email";
private static final String COLUMN_PASS = "password";
SQLiteDatabase db;
private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "(" + COLUMN_ID + " INTEGER PRIMARY KEY, " + COLUMN_USERNAME + " TEXT, " +
COLUMN_EMAIL + " TEXT, " + COLUMN_PASS + " TEXT " + ")";
private String DROP_USER_TABLE = " DROP TABLE IF EXISTS " + TABLE_USER;
//table created
private static final String TABLE_INCOME = "income";
//columns in table
private static final String COL1 = "id";
private static final String COL2 = "iAmount";
private static final String COL3 = "iMethod";
private static final String COL4 = "date";
private String CREATE_INCOME_TABLE = "CREATE TABLE " + TABLE_INCOME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" FIRSTNAME TEXT, LASTNAME TEXT, FAVFOOD TEXT)";
private String DROP_INCOME_TABLE = " DROP TABLE IF EXISTS " + TABLE_INCOME;
//table created
private static final String TABLE_EXPENSE = "expense";
//columns in table
private static final String COLUMN_EID = "id";
private static final String COLUMN_EAMOUNT = "eAmount";
private static final String COLUMN_EMETHOD = "eMethod";
private static final String COLUMN_EDATE = "date";
private String CREATE_EXPENSE_TABLE = "CREATE TABLE " + TABLE_EXPENSE + "(" + COLUMN_EID + " INTEGER PRIMARY KEY, " + COLUMN_EAMOUNT + " TEXT, " +
COLUMN_EMETHOD + " TEXT, " + COLUMN_EDATE + "TEXT " + ")";
private String DROP_EXPENSE_TABLE = " DROP TABLE IF EXISTS " + TABLE_EXPENSE;
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_USER_TABLE);
db.execSQL(CREATE_INCOME_TABLE);
db.execSQL(CREATE_EXPENSE_TABLE);
this.db = db;
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(DROP_USER_TABLE);
db.execSQL(DROP_INCOME_TABLE);
db.execSQL(DROP_EXPENSE_TABLE);
this.onCreate(db);
}
public DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void insertUser(User user){
db = this.getWritableDatabase();
ContentValues values = new ContentValues();
String query = "select * from " + TABLE_USER;
Cursor cursor = db.rawQuery(query, null);
int count = cursor.getCount();
values.put(COLUMN_ID, count);
values.put(COLUMN_USERNAME, user.getUsername());
values.put(COLUMN_EMAIL, user.getEmail());
values.put(COLUMN_PASS, user.getPassword());
db.insert(TABLE_USER, null, values);
db.close();
}
public boolean insertIncome(int iAmount, String iMethod, String iDate) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL2, iAmount);
contentValues.put(COL3, iMethod);
contentValues.put(COL4, iDate);
long result = db.insert(TABLE_INCOME, null, contentValues);
if(result == -1){
return false;
}else {
return true;
}
}
public void insertExpense(Income income){
}
public String checkUser(String username){
db = this.getReadableDatabase();
String query = "SELECT username, password from user";
Cursor cursor = db.rawQuery(query, null);
String a, b;
b = "error";
if(cursor.moveToFirst()){
do{
a = cursor.getString(0);
if(a.equals(username)){
b = cursor.getString(1);
break;
}
}while(cursor.moveToNext());
}
return b;
}
public Cursor getList(){
db = this.getWritableDatabase();
Cursor query = db.rawQuery("SELECT * FROM " + TABLE_INCOME, null);
return query;
}
}
模型类：
公共课收入{
public int iAmount;
public String iMethod;
public String iDate;
public Income(int iAmount, String iMethod, String iDate) {
iAmount = iAmount;
iMethod = iMethod;
iDate = iDate;
}
public int getiAmount() {
return iAmount;
}
public void setiAmount(int incAmount) {
this.iAmount = incAmount;
}
public String getiMethod() {
return iMethod;
}
public void setiMethod(String iMethod) {
this.iMethod = iMethod;
}
public String getiDate() {
return iDate;
}
public void setDate(String iDate) {
iDate = iDate;
}
}
尝试插入数据的类：
public class incomePlus extends AppCompatActivity {
public TextView transactionIncome;
public Button incomeSubmit;
public EditText incomeAmount;
public EditText incomeDate;
public Spinner Category;
DatabaseHelper db = new DatabaseHelper(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_income_plus);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
transactionIncome = (TextView) findViewById(R.id.transactionIncome);
incomeSubmit = (Button) findViewById(R.id.incomeSubmit);
incomeAmount = (EditText)findViewById(R.id.incomeAmount);
incomeDate = (EditText) findViewById(R.id.incomeDate);
Category = (Spinner) findViewById(R.id.Category);
List<String> incomeCat = new ArrayList<String>();
incomeCat.add("Salary");
incomeCat.add("Lotto");
incomeCat.add("Gift");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, incomeCat);
Category.setAdapter(adapter);
incomeSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String iAM = incomeAmount.getText().toString();
int iAmount = Integer.parseInt(iAM);
String iDate = incomeDate.getText().toString();
String iMethod = Category.getSelectedItem().toString();
if (incomeAmount.getText().toString().trim().length() > 0 && incomeDate.getText().toString().trim().length() > 0 && Category.getSelectedItem().toString().trim().length() > 0 ) {
Intent homeScreen = new Intent(incomePlus.this, MainActivity.class);
startActivity(homeScreen);
addData(iAmount, iMethod, iDate);
}
else {
Toast.makeText(incomePlus.this, "Please Fill In All The Fields", Toast.LENGTH_LONG).show();
}
}
});
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_income, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menuMain : startActivity (new Intent(this, MainActivity.class));
break;
}
switch (item.getItemId())
{
case R.id.menuExpense : startActivity (new Intent(this, ExpenseIncome.class));
break;
}
return super.onOptionsItemSelected(item);
}
public void addData(int iAmount, String iMethod, String iDate){
boolean insertData = db.insertIncome(iAmount, iMethod, iDate);
if(insertData==true){
Toast.makeText(incomePlus.this, "Data Entered", Toast.LENGTH_LONG).show();
}else {
Toast.makeText(incomePlus.this, "Failure", Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分：0)
您在Create table query的末尾缺少comma。
使用：
private String CREATE_INCOME_TABLE = "CREATE TABLE " + TABLE_INCOME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" FIRSTNAME TEXT, LASTNAME TEXT, FAVFOOD TEXT);";
在结尾的双引号内添加逗号 - 对于所有创建表查询。