我想删除现有的SQLite数据库。我已经尝试过每个查询删除现有数据库，但它没有从android.Below中的文件浏览器中删除是我的数据库代码告诉我我错在哪里。
Password.Db
package com.sunmobileappnow.mobileappnow;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class PasswordDB
{
EditText edittext;
TextView tv;
private static final String DATABASE_NAME = "DGC.db";
private static final int DATABASE_VERSION = 1;
static final String TABLE_NAME = "Drivers";
public static Context context;
public static SQLiteDatabase db;
private SQLiteStatement insertStmt;
private static final String INSERT = "insert into " + TABLE_NAME + " (mfname,msname,mun,mstreet,msuburb,mstate,mpostcode,mlicense,mid,mmobile,memail,mimagelicense,mauthcard,mpic) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
protected static final String enternpw = null;
public PasswordDB(Context context) {
PasswordDB.context = context;
OpenHelper openHelper = new OpenHelper(PasswordDB.context);
PasswordDB.db = openHelper.getWritableDatabase();
this.insertStmt = PasswordDB.db.compileStatement(INSERT);
}
public long insert(String mfname,String msname,String mun,String mstreet,String msuburb,String mstate,String mpostcode,String mlicense,String mid,String mmobile,String memail,byte[] mimagelicense,byte[] mauthcard,byte[] mpic ) {
this.insertStmt.bindString(1, mfname);
this.insertStmt.bindString(2, msname);
this.insertStmt.bindString(3, mun);
this.insertStmt.bindString(4, mstreet);
this.insertStmt.bindString(5, msuburb);
this.insertStmt.bindString(6, mstate);
// this.insertStmt.bindString(7, mpassword);
this.insertStmt.bindString(7, mpostcode);
this.insertStmt.bindString(8, mlicense);
this.insertStmt.bindString(9, mid);
this.insertStmt.bindString(10, mmobile);
this.insertStmt.bindString(11, memail);
this.insertStmt.bindBlob(12, mimagelicense);
this.insertStmt.bindBlob(13, mauthcard);
this.insertStmt.bindBlob(14, mpic);
return this.insertStmt.executeInsert();
}
public void deleteAll() {
db.delete(TABLE_NAME, null, null);
}
public void dropTable() {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
}
public List<String[]> selectAll()
{
List<String[]> list = new ArrayList<String[]>();
Cursor cursor = db.query(TABLE_NAME, new String[] { "first_name", "Surname","unit_no","Street_name","Suburb","State"," post_code","driving_lic","authority_id","mobile_no","Email","password","license_pic","audit_card_pic","face_pic"," date_of_creation","status","login_token","device_token","latitude", "longitude" }, null, null, null, null, "mEmail asc");
// Cursor cursor = db.query(TABLE_NAME, new String[] { "id","mfname","msname","mun","mstreet","msuburb","mstate","mpassword","mconfirm_password","mpostcode","mlicense","mid","mmobile","memail","mimagelicense","mauthcard","mpic" }, null, null, null, null, "memail asc");
int x=0;
if (cursor.moveToFirst()) {
do {
String[] b1=new String[]{cursor.getString(0),cursor.getString(1),cursor.getString(2),
cursor.getString(3),cursor.getString(4),cursor.getString(5),
cursor.getString(6),cursor.getString(7),cursor.getString(8),cursor.getString(9),cursor.getString(10),cursor.getString(11),cursor.getString(12),cursor.getString(13),cursor.getString(14),cursor.getString(15)};
list.add(b1);
x=x+1;
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
cursor.close();
return list;
}
public void delete(int rowId) {
db.delete(TABLE_NAME, null, null);
}
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + " (id INTEGER PRIMARY KEY,first_name TEXT,Surname TEXT,unit_no TEXT,Street_name TEXT,Suburb TEXT,state TEXT,pickup_time TEXT,date_of_creation TEXT, destination TEXT, group TEXT,fare TEXT, latitude TEXT, longitude TEXT,city TEXT,license_pic BLOB,audit_card_pic BLOB,face_pic BLOB)");
// db.execSQL("CREATE TABLE " + TABLE_NAME + " (id INTEGER PRIMARY KEY, mfname TEXT, msname TEXT,mun TEXT,mstreet TEXT,msuburb TEXT,mstate TEXT,mpassword TEXT,mconfirm_password TEXT,mpostcode TEXT,mlicense TEXT,mid TEXT,mmobile TEXT,memail TEXT,mimagelicense BLOB,mauthcard BLOB,mpic BLOB)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
public Cursor rawQuery(String selectQuery, Object object) {
// TODO Auto-generated method stub
return null;
}
public static PasswordDB getDBAdapterInstance(ViewData viewPassword) {
// TODO Auto-generated method stub
return null;
}
public Object getenternpw() {
// TODO Auto-generated method stub
return null;
}
public static Cursor getSinlgeEntry() {
// TODO Auto-generated method stub
Cursor cur =db.rawQuery("SELECT * FROM "+ TABLE_NAME, null);
// colName1+"='"+name+"'" -> wherclause
System.out.println("Record count are "+cur.getCount());
return cur;
}
public static void close() {
// TODO Auto-generated method stub
}
public PasswordDB open() {
// TODO Auto-generated method stub
return null;
}
public void delete(String tableName, Object object, Object object2) {
// TODO Auto-generated method stub
}
public Cursor query(String tableName, String[] strings, Object object,
Object object2, Object object3, Object object4, String string) {
// TODO Auto-generated method stub
return null;
}
public void insert(String first_name, String surname, String unit_no,
String street_name, String suburb, String state, String post_code,
String driving_lic, String authority_id, String mobile_no,
String email, String password, String license_pic,
String audit_card_pic, String face_pic, String date_of_creation,
String status, String device_token, String latitude, String longitude) {
// TODO Auto-generated method stub
}