我收到了这个错误：
没有这样的表格：表格
我正在尝试添加三个JSON，JSON_modified和AdminId字段：
static final String DATABASE_NAME = "db1";
static final int DATABASE_VERSION = 2;
public static final int NAME_COLUMN = 1;
static final String DATABASE_TABLE = "create table " + "adminreg" +
"( " + "AdminRegID" + " integer primary key autoincrement," + "Rest_name text,Contact_person_name text,text,PASSWORD text,Address text); ";
// Variable to hold the database instance
static final String DATABASE_TABLE_REG="CREATE TABLE IF NOT EXISTS " + " form " +
"(" + "Id" + " integer primary key autoincrement, " + " JSON text, AdminId text, JSON_modified text);";
public SQLiteDatabase db;
private final Context context;
private DataBaseHelper dbHelper;
public LoginDatabaseAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public LoginDatabaseAdapter open() throws SQLException
{
db = dbHelper.getWritableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
public void insertEntry(String json, String json_modified)
{
Log.e("Data Insert reached", "yes");
ContentValues newValues = new ContentValues();
Log.e("JSON STRING to be insert", json);
newValues.put("JSON", json);
newValues.put("JSON_modified", json_modified);
newValues.put("AdminId", "1");
db.insert("form", null, newValues);
Toast.makeText(context, "Data Is Successfully Saved", Toast.LENGTH_LONG).show();
Log.e("context", "Toast");
}
DataBaseHelper.java
public DataBaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version)
{
super(context, name, factory, version);
}
// Called when no database exists in disk and the helper class needs
// to create a new one.
@Override
public void onCreate(SQLiteDatabase _db)
{
_db.execSQL(LoginDatabaseAdapter.DATABASE_TABLE_REG);
_db.execSQL(LoginDatabaseAdapter.DATABASE_TABLE);
}
// Called when there is a database version mismatch meaning that the version
// of the database on disk needs to be upgraded to the current version.
@Override
public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
{
// Log the version upgrade.
Log.w("TaskDBAdapter", "Upgrading from version " + _oldVersion + " to " + _newVersion + ", which will destroy all old data");
// Upgrade the existing database to conform to the new version. Multiple
// previous versions can be handled by comparing _oldVersion and _newVersion
// values.
// The simplest case is to drop the old table and create a new one.
_db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
// Create a new one.
onCreate(_db);
}
答案 0 :(得分：1)
只需增加数据库版本或重新安装您的应用。
答案 1 :(得分：0)
public class LoginDataBaseAdapter {
public final static String DATABASE_NAME="db1";
public final static int VERSION=1;
public final static String TABLE_NAME="form";
private final static String ID="ID";
private final static String JSON="JSON";
private final static String JSON_MODIFIED="JSON_MODIFIED";
private final static String ADMIN_ID="ADMIN_ID";
public final static String CREATE_TABLE="CREATE TABLE " +TABLE_NAME+ " ("+ID+ " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,"+JSON+" TEXT NOT NULL," +
""+JSON_MODIFIED+" TEXT NOT NULL,"+ADMIN_ID+" TEXT NOT NULL)";
public final static String DROP_TABLE="DROP TABLE IF EXISTS "+TABLE_NAME;
public Context context;
public SQLiteDatabase sql_db;
public DataBaseHelper our_db_helper;
public LoginDataBaseAdapter(Context context)
{
this.context=context;
}
public void open() {
our_db_helper=new DataBaseHelper(context);
sql_db=our_db_helper.getWritableDatabase();
}
public void close() {
sql_db.close();
}
public long dataInsert(String json,String modified_json, String admin_id)
{
try{
ContentValues data=new ContentValues();
data.put(JSON,json);
data.put(JSON_MODIFIED, modified_json);
data.put(ADMIN_ID, admin_id);
return sql_db.insert(TABLE_NAME, null, data);
}
catch(Exception ee)
{
}
return -1;
}
public String getData()
{
try{
String[] columns=new String[]{ID,JSON,JSON_MODIFIED,ADMIN_ID};
Cursor content=sql_db.query(TABLE_NAME, columns, null, null, null, null, null);
int index_id=content.getColumnIndex(ID);
int index_json=content.getColumnIndex(JSON);
int index_json_modifier=content.getColumnIndex(JSON_MODIFIED);
int index_admin_id=content.getColumnIndex(ADMIN_ID);
String data="";
if(content==null)
return data;
for(content.moveToFirst();!content.isAfterLast();content.moveToNext())
{
data=data+ "Id: "+content.getInt(index_id)+" JSON: "+content.getString(index_json)+
" Modified JSON: "+content.getString(index_json_modifier)+" Admin_id: "+content.getString(index_admin_id)+"\n";
}
return data;
}catch(Exception ee){
return "";
}
}
}
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DataBaseHelper extends SQLiteOpenHelper
{
public DataBaseHelper(Context context) {
super(context, LoginDataBaseAdapter.DATABASE_NAME, null, LoginDataBaseAdapter.VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(LoginDataBaseAdapter.CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(LoginDataBaseAdapter.DROP_TABLE);
onCreate(db);
}
}
<br>
现在您可以使用任何类的代码......
的例如：
（1）ToInsertData：
LoginDataBaseAdapter db=new LoginDataBaseAdapter(YOUR_CLASS_NAME.this);
db.open();
long response= db.dataInsert("a", "abd", "abcd");
db.close();
if(response!=-1)
Toast.makeText(YOUR_CLASS_NAME.this, "Data Inserted...", Toast.LENGTH_LONG).show();
else
Toast.makeText(YOUR_CLASS_NAME.this, "Some Error", Toast.LENGTH_LONG).show();
（2）ToFetchData：
LoginDataBaseAdapter db=new LoginDataBaseAdapter(YOUR_CLASS_NAME.this);
db.open();
Toast.makeText(YOUR_CLASS_NAME.this, db.getData().toString(), Toast.LENGTH_LONG).show();
db.close();
答案 2 :(得分：0)
您必须卸载该应用程序，然后重新安装。它应该在那之后工作。您的设备上可能有一个旧版本的数据库，它具有（空）数据库。