我正在尝试在我的SQLite表中添加TimeStamp字段，请参阅下面的代码：
myDBClass.java
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
// Create Table Name
db.execSQL("CREATE TABLE " + TABLE_MEMBER +
"(OperatorID INTEGER PRIMARY KEY AUTOINCREMENT," +
" DeviceID TEXT(100)," +
" EmailID TEXT(100)," +
" Operator TEXT(100)," +
" Created_at DATETIME DEFAULT CURRENT_TIMESTAMP);");
Log.d("CREATE TABLE","Create Table Successfully.");
}
// Insert Data
public long InsertData(String strDeviceID, String strEmailID, String strEventOperator, String strCreated_at) {
// TODO Auto-generated method stub
try {
SQLiteDatabase db;
db = this.getWritableDatabase(); // Write Data
ContentValues Val = new ContentValues();
Val.put("DeviceID", strDeviceID);
Val.put("EmailID", strEmailID);
Val.put("Operator", strEventOperator);
Val.put("Created_at", getDateTime());
long rows = db.insert(TABLE_MEMBER, null, Val);
db.close();
return rows; // return rows inserted.
} catch (Exception e) {
return -1;
}
}
private String getDateTime() {
SimpleDateFormat dateFormat = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss", Locale.getDefault());
Date date = new Date();
return dateFormat.format(date);
}
// Select Data
public String[] SelectData(String strOperatorID) {
// TODO Auto-generated method stub
try {
String arrData[] = null;
SQLiteDatabase db;
db = this.getReadableDatabase(); // Read Data
Cursor cursor = db.query(TABLE_MEMBER, new String[] { "*" },
"OperatorID=?",
new String[] { String.valueOf(strOperatorID) }, null, null, null, null);
if(cursor != null)
{
if (cursor.moveToFirst()) {
arrData = new String[cursor.getColumnCount()];
/***
* 0 = DeviceID
* 1 = EmailID
* 2 = EventOperator
*/
arrData[0] = cursor.getString(0);
arrData[1] = cursor.getString(1);
arrData[2] = cursor.getString(2);
}
}
cursor.close();
db.close();
return arrData;
} catch (Exception e) {
return null;
}
}
AddActivity.java
public boolean SaveData()
{
final EditText editDeviceID = (EditText) findViewById(R.id.editDeviceID);
final EditText editEmailID = (EditText) findViewById(R.id.editEmailID);
final EditText editEveOpe = (EditText) findViewById(R.id.editEveOpe);
// Dialog
final AlertDialog.Builder adb = new AlertDialog.Builder(this);
AlertDialog ad = adb.create();
// new Class DB
final myDBClass myDb = new myDBClass(this);
// Save Data
long saveStatus = myDb.InsertData(
editDeviceID.getText().toString(),
editEmailID.getText().toString(),
editEveOpe.getText().toString()
);
if(saveStatus <= 0)
{
ad.setMessage("Error!! ");
ad.show();
return false;
}
Toast.makeText(AddActivity.this,"Added Data Successfully. ",
Toast.LENGTH_SHORT).show();
return true;
}
}
日志：
12-19 01:39:08.147: E/SQLiteLog(6963): (1) table members has no column named Created_at
12-19 01:39:08.203: E/SQLiteDatabase(6963): Error inserting DeviceID=safdasfewrwesd23432 Created_at=2013-12-19 01:39:08 EventOperator=adsfewvweceEvent EmailID=sdfasdf@desa.cond
12-19 01:39:08.203: E/SQLiteDatabase(6963): android.database.sqlite.SQLiteException: table members has no column named Created_at (code 1): , while compiling: INSERT INTO members(DeviceID,Created_at,EventOperator,EmailID) VALUES (?,?,?,?)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at com.example.database.myDBClass.InsertData(myDBClass.java:59)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at com.example.database.AddActivity.SaveData(AddActivity.java:49)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at com.example.database.AddActivity$1.onClick(AddActivity.java:26)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.view.View.performClick(View.java:4240)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.view.View$PerformClick.run(View.java:17721)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.os.Handler.handleCallback(Handler.java:730)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.os.Handler.dispatchMessage(Handler.java:92)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.os.Looper.loop(Looper.java:137)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at android.app.ActivityThread.main(ActivityThread.java:5103)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at java.lang.reflect.Method.invokeNative(Native Method)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at java.lang.reflect.Method.invoke(Method.java:525)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-19 01:39:08.203: E/SQLiteDatabase(6963): at dalvik.system.NativeStart.main(Native Method)
12-19 01:39:08.434: D/dalvikvm(6963): GC_FOR_ALLOC freed 138K, 7% free 3169K/3384K, paused 28ms, total 38ms
我正在表格成员没有列名为Created_at
我对插入查询* * （AddActivity.java） *
中 * Created_at列的用法有点混淆仍然在我的成员表中，字段为：OperatorID，DeviceID，EmailID，Operator但我也尝试在成员表中添加 Created_at 字段。但是面临问题
答案 0 :(得分：1)
sqlite中没有像 DATETIME 这样的数据类型。所以只需更改下面的代码：
db.execSQL("CREATE TABLE " + TABLE_MEMBER +
"(OperatorID INTEGER PRIMARY KEY AUTOINCREMENT," +
" DeviceID TEXT(100)," +
" EmailID TEXT(100)," +
" Operator TEXT(100)," +
" Created_at TIMESTAMP NOT NULL DEFAULT current_timestamp);");
答案 1 :(得分：1)
Sqlite不支持DATETIME类型。相反，您可以将时间戳存储为整数（毫秒）或文本。
答案 2 :(得分：0)
更改数据库架构时，例如代码中的CREATE TABLE，您必须确保对实际数据库文件也进行相同的更改。
SQLiteOpenHelper将对您的数据库文件进行版本控制。它是传递给SQLiteOpenHelper构造函数的版本号，它告诉当前的代码架构版本。更改架构时，应增加该版本号。
SQLiteOpenHelper将调用onUpgrade()。您可以调用ALTER TABLE等来升级数据库，或者只调用现有表上的DROP TABLE并调用onCreate()以使用最新架构创建它们。在后一种情况下，您将丢失数据库中的所有数据。
另一种更简单的方法：只需删除旧的数据库文件，而不是增加架构版本号。您可以通过设置清除应用数据来执行此操作 - ＆gt;管理应用程序或者只是卸载并重新安装应用程序。不过，对于已发布的版本，请不要依赖此技巧，只能在开发期间进行架构更新。