2014-12-05 3 views
0

我是一個新的開發人員,我有一個SQLite問題。某些原因我無法將兩列(table_row_three和table_row_four)添加到我的SQLite數據表中。當我讀取數據庫文件時,它有一個帶有「id」,「table_row_one」和「table_row_two」的表格,但缺少「table_row_three」和「table_row_four」。Android的SQLite問題 - 表__沒有列名___

我的logcat中的錯誤消息是:「(1)table database_table has no column named table_row_three」。

我真的很困惑爲什麼列「table_row_three」和「table_row_four」沒有顯示在我的表上,爲什麼只有「id」,「table_row_one」和「table_row_two」出現在我的數據表中。

這裏是我的數據庫類:

DatabaseHandler.java 


import java.util.ArrayList; 

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; 
import android.util.Log; 



public class DatabaseHandler 
{ 

Context context; 


private SQLiteDatabase db; 


private final String DB_NAME = "database_name"; 
private final int DB_VERSION = 2; 


private final String TABLE_NAME = "database_table"; 
private final String TABLE_ROW_ID = "id"; 

private final String TABLE_ROW_ONE = "table_row_one"; 
private final String TABLE_ROW_TWO = "table_row_two"; 
private final String TABLE_ROW_THREE = "table_row_three"; 
private final String TABLE_ROW_FOUR = "table_row_four"; 

public DatabaseHandler(Context context) 
{ 
    this.context = context; 

    // create or open the database 
    CustomSQLiteOpenHelper helper = new CustomSQLiteOpenHelper(context); 
    this.db = helper.getWritableDatabase(); 
} 


public void addRow(String rowStringOne, String rowStringTwo, String rowStringThree, String rowStringFour) 
{ 
    // this is a key value pair holder used by android's SQLite functions 
    ContentValues values = new ContentValues(); 
    //TABLE_ROW_ONE = Title 
    //TABLE_ROW_TWO = Location 
    //TABLE_ROW_THREE = Notes 
    //TABLE_ROW_FOUR = Picture 
    values.put(TABLE_ROW_ONE, rowStringOne); 
    values.put(TABLE_ROW_TWO, rowStringTwo); 
    values.put(TABLE_ROW_THREE, rowStringThree); 
    values.put(TABLE_ROW_FOUR, rowStringFour); 

    // ask the database object to insert the new data 
    try{db.insert(TABLE_NAME, null, values);} 
    catch(Exception e) 
    { 
     Log.e("DB ERROR", e.toString()); 
     e.printStackTrace(); 
    } 
} 




public void deleteRow(long rowID) 
{ 
    // ask the database manager to delete the row of given id 
    try {db.delete(TABLE_NAME, TABLE_ROW_ID + "=" + rowID, null);} 
    catch (Exception e) 
    { 
     Log.e("DB ERROR", e.toString()); 
     e.printStackTrace(); 
    } 
} 

public void updateRow(long rowID, String rowStringOne, String rowStringTwo, String rowStringThree, String rowStringFour) 
{ 
    ContentValues values = new ContentValues(); 
    values.put(TABLE_ROW_ONE, rowStringOne); 
    values.put(TABLE_ROW_TWO, rowStringTwo); 
    values.put(TABLE_ROW_THREE, rowStringThree); 
    values.put(TABLE_ROW_FOUR, rowStringFour); 

    try {db.update(TABLE_NAME, values, TABLE_ROW_ID + "=" + rowID, null);} 
    catch (Exception e) 
    { 
     Log.e("DB Error", e.toString()); 
     e.printStackTrace(); 
    } 
} 


public ArrayList<Object> getRowAsArray(long rowID) 
{ 

    ArrayList<Object> rowArray = new ArrayList<Object>(); 
    Cursor cursor; 

    try 
    { 

     cursor = db.query 
       (
         TABLE_NAME, 
         new String[] { TABLE_ROW_ID, TABLE_ROW_ONE, TABLE_ROW_TWO, TABLE_ROW_THREE, TABLE_ROW_FOUR }, 
         TABLE_ROW_ID + "=" + rowID, 
         null, null, null, null, null 
       ); 


     cursor.moveToFirst(); 


     if (!cursor.isAfterLast()) 
     { 
      do 
      { 
       rowArray.add(cursor.getLong(0)); 
       rowArray.add(cursor.getString(1)); 
       rowArray.add(cursor.getString(2)); 
       rowArray.add(cursor.getString(3)); 
       rowArray.add(cursor.getString(4)); 
      } 
      while (cursor.moveToNext()); 
     } 


     cursor.close(); 
    } 
    catch (SQLException e) 
    { 
     Log.e("DB ERROR", e.toString()); 
     e.printStackTrace(); 
    } 

    // return the ArrayList containing the given row from the database. 
    return rowArray; 
} 






public ArrayList<ArrayList<Object>> getAllRowsAsArrays() 
{ 

    ArrayList<ArrayList<Object>> dataArrays = new ArrayList<ArrayList<Object>>(); 


    Cursor cursor; 

    try 
    { 
     cursor = db.query(
       TABLE_NAME, 
       new String[]{TABLE_ROW_ID, TABLE_ROW_ONE, TABLE_ROW_TWO, TABLE_ROW_THREE, TABLE_ROW_FOUR}, 
       null, null, null, null, null 
     ); 

     cursor.moveToFirst(); 

     if (!cursor.isAfterLast()) 
     { 
      do 
      { 
       ArrayList<Object> dataList = new ArrayList<Object>(); 

       dataList.add(cursor.getLong(0)); 
       dataList.add(cursor.getString(1)); 
       dataList.add(cursor.getString(2)); 
       dataList.add(cursor.getString(3)); 
       dataList.add(cursor.getString(4)); 
       dataArrays.add(dataList); 
      } 
      while (cursor.moveToNext()); 
     } 
    } 
    catch (SQLException e) 
    { 
     Log.e("DB Error", e.toString()); 
     e.printStackTrace(); 
    } 

    return dataArrays; 
} 








private class CustomSQLiteOpenHelper extends SQLiteOpenHelper 
{ 
    public CustomSQLiteOpenHelper(Context context) 
    { 
     super(context, DB_NAME, null, DB_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) 
    { 

     String newTableQueryString = "create table " + 
       TABLE_NAME + 
       " (" + 
       TABLE_ROW_ID + " integer primary key autoincrement not null," + 
       TABLE_ROW_ONE + " text," + 
       TABLE_ROW_TWO + " text" + 
       TABLE_ROW_THREE + " text" + 
       TABLE_ROW_FOUR + " text" + 
       ");"; 
     db.execSQL(newTableQueryString); 
    } 


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

    } 
} 

這裏是我的測試類:

public class DatabaseExampleActivity extends Activity { 
EditText textFieldOne, textFieldTwo, textFieldThree, textFieldFour, 
     idField, 
     updateIDField, updateTextFieldOne, updateTextFieldTwo,updateTextFieldThree, updateTextFieldFour; 

Button addButton, deleteButton, retrieveButton, updateButton; 

TableLayout dataTable; 

DatabaseHandler db; 



@Override 
public void onCreate(Bundle savedInstanceState) { 
    // this try catch block returns better error reporting to the log 
    try { 
     // Android specific calls 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_databaseexample); 

     // create the database manager object 
     db = new DatabaseHandler(this); 

     // create references and listeners for the GUI interface 
     setupViews(); 

     // make the buttons clicks perform actions 
     addButtonListeners(); 

     // load the data table 
     updateTable(); 
    } catch (Exception e) { 
     Log.e("ERROR", e.toString()); 
     e.printStackTrace(); 
    } 
} 


private void setupViews() { 
    // THE DATA TABLE 
    dataTable = (TableLayout) findViewById(R.id.data_table); 

    // THE DATA FORM FIELDS 
    textFieldOne = (EditText) findViewById(R.id.text_field_one); 
    textFieldTwo = (EditText) findViewById(R.id.text_field_two); 
    textFieldThree = (EditText) findViewById(R.id.text_field_three); 
    textFieldFour = (EditText) findViewById(R.id.text_field_four); 
    idField = (EditText) findViewById(R.id.id_field); 
    updateIDField = (EditText) findViewById(R.id.update_id_field); 
    updateTextFieldOne = (EditText) findViewById(R.id.update_text_field_one); 
    updateTextFieldTwo = (EditText) findViewById(R.id.update_text_field_two); 
    updateTextFieldThree = (EditText) findViewById(R.id.update_text_field_three); 
    updateTextFieldFour = (EditText) findViewById(R.id.update_text_field_four); 

    addButton = (Button) findViewById(R.id.add_button); 
    deleteButton = (Button) findViewById(R.id.delete_button); 
    retrieveButton = (Button) findViewById(R.id.retrieve_button); 
    updateButton = (Button) findViewById(R.id.update_button); 
} 



private void addButtonListeners() { 
    addButton.setOnClickListener 
      (
        new View.OnClickListener() { 
         @Override 
         public void onClick(View v) { 
          addRow(); 
         } 
        } 
      ); 

    deleteButton.setOnClickListener 
      (
        new View.OnClickListener() { 
         @Override 
         public void onClick(View v) { 
          deleteRow(); 
         } 
        } 
      ); 

    updateButton.setOnClickListener 
      (
        new View.OnClickListener() { 
         @Override 
         public void onClick(View v) { 
          updateRow(); 
         } 
        } 
      ); 

    retrieveButton.setOnClickListener 
      (
        new View.OnClickListener() { 
         @Override 
         public void onClick(View v) { 
          retrieveRow(); 
         } 
        } 
      ); 

} 


private void addRow() { 
    try { 
     // ask the database manager to add a row given the two strings 
     db.addRow 
       (
         textFieldOne.getText().toString(), 
         textFieldTwo.getText().toString(), 
         textFieldThree.getText().toString(), 
         textFieldFour.getText().toString() 

       ); 

     // request the table be updated 
     updateTable(); 

     // remove all user input from the Activity 
     emptyFormFields(); 
    } catch (Exception e) { 
     Log.e("Add Error", e.toString()); 
     e.printStackTrace(); 
    } 
} 


private void deleteRow() { 
    try { 
     // ask the database manager to delete the row with the give rowID. 
     db.deleteRow(Long.parseLong(idField.getText().toString())); 

     // request the table be updated 
     updateTable(); 

     // remove all user input from the Activity 
     emptyFormFields(); 
    } catch (Exception e) { 
     Log.e("Delete Error", e.toString()); 
     e.printStackTrace(); 
    } 
} 


private void retrieveRow() { 
    try { 
     // The ArrayList that holds the row data 
     ArrayList<Object> row; 
     // ask the database manager to retrieve the row with the given rowID 
     row = db.getRowAsArray(Long.parseLong(updateIDField.getText().toString())); 

     // update the form fields to hold the retrieved data 
     updateTextFieldOne.setText((String) row.get(1)); 
     updateTextFieldTwo.setText((String) row.get(2)); 
     updateTextFieldThree.setText((String) row.get(3)); 
     updateTextFieldFour.setText((String) row.get(4)); 

    } catch (Exception e) { 
     Log.e("Retrieve Error", e.toString()); 
     e.printStackTrace(); 
    } 
} 

private void updateRow() { 
    try { 
     // ask the database manager to update the row based on the information 
     // found in the corresponding user entry fields 
     db.updateRow 
       (
         Long.parseLong(updateIDField.getText().toString()), 
         updateTextFieldOne.getText().toString(), 
         updateTextFieldTwo.getText().toString(), 
         updateTextFieldThree.getText().toString(), 
         updateTextFieldFour.getText().toString() 
       ); 

     updateTable(); 

     emptyFormFields(); 
    } catch (Exception e) { 
     Log.e("Update Error", e.toString()); 
     e.printStackTrace(); 
    } 
} 


private void emptyFormFields() { 
    textFieldOne.setText(""); 
    textFieldTwo.setText(""); 
    textFieldThree.setText(""); 
    textFieldFour.setText(""); 
    idField.setText(""); 
    updateIDField.setText(""); 
    updateTextFieldOne.setText(""); 
    updateTextFieldTwo.setText(""); 
    updateTextFieldThree.setText(""); 
    updateTextFieldFour.setText(""); 
} 


private void updateTable() { 
    // delete all but the first row. remember that the count 
    // starts at one and the index starts at zero 
    while (dataTable.getChildCount() > 1) { 
     // while there are at least two rows in the table widget, delete 
     // the second row. 
     dataTable.removeViewAt(1); 
    } 

    // collect the current row information from the database and 
    // store it in a two dimensional ArrayList 
    ArrayList<ArrayList<Object>> data = db.getAllRowsAsArrays(); 

    // iterate the ArrayList, create new rows each time and add them 
    // to the table widget. 
    for (int position = 0; position < data.size(); position++) { 
     TableRow tableRow = new TableRow(this); 

     ArrayList<Object> row = data.get(position); 

     TextView idText = new TextView(this); 
     idText.setText(row.get(0).toString()); 
     tableRow.addView(idText); 

     TextView textOne = new TextView(this); 
     textOne.setText(row.get(1).toString()); 
     tableRow.addView(textOne); 

     TextView textTwo = new TextView(this); 
     textTwo.setText(row.get(2).toString()); 
     tableRow.addView(textTwo); 


     TextView textThree = new TextView(this); 
     textThree.setText(row.get(3).toString()); 
     tableRow.addView(textThree); 


     TextView textFour = new TextView(this); 
     textFour.setText(row.get(4).toString()); 
     tableRow.addView(textFour); 


     dataTable.addView(tableRow); 
    } 
} 
+0

你在創建表語句中缺少','。 – 2014-12-05 05:06:28

回答

3

失蹤後 '' 在創建聲明:

String newTableQueryString = "create table " + 
    TABLE_NAME + 
    " (" + 
    TABLE_ROW_ID + " integer primary key autoincrement not null," + 
    TABLE_ROW_ONE + " text," + 
    TABLE_ROW_TWO + " text," + 
    TABLE_ROW_THREE + " text," + 
    TABLE_ROW_FOUR + " text" + 
    ");"; 
1
  TABLE_ROW_TWO + " text" + 
      TABLE_ROW_THREE + " text" + 
      TABLE_ROW_FOUR + " text" + 

放,文字

TABLE_ROW_TWO + " text," + 
      TABLE_ROW_THREE + " text," + 
      TABLE_ROW_FOUR + " text" + 
0

變化CustomSQLiteOpenHelper這樣的代碼,

private class CustomSQLiteOpenHelper extends SQLiteOpenHelper 
{ 
    public CustomSQLiteOpenHelper(Context context) 
    { 
     super(context, DB_NAME, null, DB_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) 
    { 

     String newTableQueryString = "create table " + 
       TABLE_NAME + 
       " (" + 
       TABLE_ROW_ID + " integer primary key autoincrement not null," + 
       TABLE_ROW_ONE + " text," + 
       TABLE_ROW_TWO + " text," + 
       TABLE_ROW_THREE + " text," + 
       TABLE_ROW_FOUR + " text" + 
       ");"; 
     db.execSQL(newTableQueryString); 
    } 


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

    } 
} 
2
String newTableQueryString = "create table " + 
      TABLE_NAME + 
      " (" + 
      TABLE_ROW_ID + " integer primary key autoincrement not null," + 
      TABLE_ROW_ONE + " text," + 
      TABLE_ROW_TWO + " text" + 
      TABLE_ROW_THREE + " text" + 
      TABLE_ROW_FOUR + " text" + 
      ");"; 

在這份聲明中,你錯過了類型defind後兩個逗號。這就是爲什麼這個字段沒有被創建,所以你發現了這個異常。並且在右括號之後的另一個事物「);」分號不是必需的。

替換您的代碼: -

String newTableQueryString = "create table " + 
      TABLE_NAME + 
      " (" + 
      TABLE_ROW_ID + " integer primary key autoincrement not null," + 
      TABLE_ROW_ONE + " text," + 
      TABLE_ROW_TWO + " text," + 
      TABLE_ROW_THREE + " text," + 
      TABLE_ROW_FOUR + " text" + 
      ")"; 

我希望這會幫助你。 :)