Question

我的DataHandler活动代码是

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DataHandlerDairy {

public static final String DATE = "date";
public static final String DAIRY = "dairy";
private static final String DATA_BASE_NAME = "mydairy";
private static final String TABLE_NAME = "table_dairy";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_CREATE="create table table_diary       (date text primary key," + "dairy text not null);";

DataBaseHelper1 dbhelper1;
Context ct;
SQLiteDatabase db;

public DataHandlerDairy(Context ct)
{
    this.ct=ct;
    dbhelper1 = new DataBaseHelper1(ct);

}

private static class DataBaseHelper1 extends SQLiteOpenHelper
{

public DataBaseHelper1(Context ct)
{
    super(ct,DATA_BASE_NAME,null, DATABASE_VERSION);
}


    @Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    try
    {
        db.execSQL(TABLE_CREATE);
    }
    catch(SQLException e)
    {
        e.printStackTrace();
    }
    }



@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    db.execSQL("DROP TABLE IF EXISTS table_dairy ");
    onCreate(db);
}

} 

public DataHandlerDairy open()
{
db = dbhelper1.getWritableDatabase();
return this;
}

public void close()
{
    dbhelper1.close();
}

public long insertData(String date,String dairy)
{
    ContentValues content = new ContentValues();
    content.put(DATE, date);
    content.put(DAIRY, dairy);
    return db.insertOrThrow(TABLE_NAME, null, content);
}

public Cursor returnData(String date1) throws SQLException
{
    Cursor c = db.query(true, TABLE_NAME, new String[] { DATE, DAIRY}, DATE + "=" + date1, null, null, null, null, null);
    if(c!=null)
    {
        c.moveToFirst();
    }
    return c;
}
}

当我尝试在DataHandler Activity中使用保存操作ie insertData()方法时。并使用Intents存储日期来自另一个活动的日期。

将数据保存到数据库的代码是

    import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

public class Write_Dairy extends Activity {

EditText et1;
ImageButton correct,wrong;
DataHandlerDairy handler2;
String getdate;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_write__dairy);




    et1 = (EditText) findViewById(R.id.writediary);
    correct=(ImageButton) findViewById(R.id.correct1);
    wrong=(ImageButton) findViewById(R.id.wrong1);


    Bundle bundle = getIntent().getExtras();
    getdate = bundle.getString("message");


    correct.setOnClickListener(new OnClickListener() {


        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub


            String getdairy = et1.getText().toString();
            handler2 = new DataHandlerDairy(getBaseContext());
            handler2.open();
            long id = handler2.insertData(getdate,getdairy);
            Toast.makeText(getBaseContext(), "your dairy is saved successfully", Toast.LENGTH_LONG).show();
            handler2.close();

            Intent ijk = new Intent(Write_Dairy.this,PickYourDate.class);
            startActivity(ijk);

        }
    });

    wrong.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            Toast.makeText(getBaseContext(), "please write your dairy again", Toast.LENGTH_LONG).show();
            et1.setText("");

        }
    });

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_write__dairy, menu);
    return true;
}

}

并且为了重新获取数据我使用了日期作为主键，我在sql和java中都将它用作字符串。用于检索数据的代码是

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Typeface;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class Read_Dairy extends Activity {


String date1;
TextView tv1;
ImageButton imgb1;
Button bt1;
DataHandlerDairy handler3;
String getdata=" ";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_read__dairy);



    tv1=(TextView) findViewById(R.id.readme);
    imgb1=(ImageButton) findViewById(R.id.tick);
    bt1=(Button) findViewById(R.id.ready);

    Bundle bundle = getIntent().getExtras();
    date1 = bundle.getString("kanna");



    bt1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            handler3 = new DataHandlerDairy(getBaseContext());
            handler3.open();
            Cursor c = handler3.returnData(date1);
            if(c.moveToFirst())
            {
                do
                {
                getdata=c.getString(1);

                }while(c.moveToNext());             
                }
            handler3.close();

            if(getdata==null)
            {
                tv1.setText("no data exists for this date");
            }
            else
            {
            tv1.setText(c.getString(1));
            }

        }

    });


    imgb1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Intent ks = new Intent(Read_Dairy.this,PickYourDate.class);
            startActivity(ks);

        }
    });

    Typeface font = Typeface.createFromAsset(getAssets(), "Strato-linked.ttf");
    tv1.setTypeface(font);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_read__dairy, menu);
    return true;
}

}

我试图存储数据时的堆栈跟踪是

E/SQLiteLog(16724): (1) no such table: table_dairy
 D/AndroidRuntime(16724): Shutting down VM
 E/AndroidRuntime(16724): FATAL EXCEPTION: main
 E/AndroidRuntime(16724): Process: simple.smile.my_dairy, PID: 16724
 E/AndroidRuntime(16724): android.database.sqlite.SQLiteException: no such table: table_dairy (code 1): , while compiling: INSERT INTO table_dairy(date,dairy) VALUES (?,?)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
 E/AndroidRuntime(16724):   at android.database.sqlite.SQLiteDatabase.insertOrThrow(SQLiteDatabase.java:1367)
 E/AndroidRuntime(16724):   at simple.smile.my_dairy.DataHandlerDairy.insertData(DataHandlerDairy.java:79)
 E/AndroidRuntime(16724):   at simple.smile.my_dairy.Write_Dairy$1.onClick(Write_Dairy.java:48)
 E/AndroidRuntime(16724):   at android.view.View.performClick(View.java:4832)
 E/AndroidRuntime(16724):   at android.view.View$PerformClick.run(View.java:19839)
 E/AndroidRuntime(16724):   at android.os.Handler.handleCallback(Handler.java:739)
 E/AndroidRuntime(16724):   at android.os.Handler.dispatchMessage(Handler.java:95)
 E/AndroidRuntime(16724):   at android.os.Looper.loop(Looper.java:211)
 E/AndroidRuntime(16724):   at android.app.ActivityThread.main(ActivityThread.java:5315)
 E/AndroidRuntime(16724):   at java.lang.reflect.Method.invoke(Native Method)
 E/AndroidRuntime(16724):   at java.lang.reflect.Method.invoke(Method.java:372)
 AndroidRuntime(16724):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:941)
E/AndroidRuntime(16724):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:736)

请问有谁能说出我做错了什么，以及如何解决错误。提前谢谢。

Answer 1

您的表格名称不匹配：

private static final String TABLE_NAME = "table_dairy"; // DAIRY?????

和

private static final String TABLE_CREATE="create table table_diary (date text primary key," + "dairy text not null);";

此

return db.insertOrThrow(TABLE_NAME, null, content);

在您创建 table_diary 时尝试插入 table_dairy 。
因此，它正确地告诉您 table_dairy 不存在。

sqlite数据库中的eroors在从android中的表中重新获取数据时出现

1 个答案: