尝试使用单个表创建数据库时遇到以下错误。无法指出导致错误的问题。虽然已经创建了表列，但仍然没有响应没有这样的列
Logcat数据：
03-16 12:08:35.954 1249-1249/com.example.bharathduraiswamy.comboedittext E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo
{com.example.bharathduraiswamy.comboedittext/com.example.bharathduraiswamy.comboedittext.AddSupplier}: android.database.sqlite.SQLiteException: no such
column: _id (code 1): , while compiling: SELECT _id, supplier_name, supplier_contact_number, supplier_address FROM SUPPLIER
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2313)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$600(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5336)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: no such column: _id (code 1): , while compiling: SELECT _id, supplier_name, supplier_contact_number,
supplier_address FROM SUPPLIER
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:886)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:497)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1200)
at com.example.bharathduraiswamy.comboedittext.VivzDatabaseAdapter.getAllRows(VivzDatabaseAdapter.java:78)
at com.example.bharathduraiswamy.comboedittext.AddSupplier.populateListView(AddSupplier.java:271)
at com.example.bharathduraiswamy.comboedittext.AddSupplier.onCreate(AddSupplier.java:71)
at android.app.Activity.performCreate(Activity.java:5122)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2277)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$600(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5336)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
MainActivity.java数据：
DBAdapter myDb;
AutoCompleteTextView customerName;
EditText customerNumber, customerAddress;
customerName = (AutoCompleteTextView) findViewById(R.id.addCustomerName);
customerNumber = (EditText) findViewById(R.id.addCustomerNumber);
customerAddress = (EditText) findViewById(R.id.addCustomerAddress);
openDB();
private void openDB() {
myDb = new DBAdapter(this);
myDb.open();
}
public void addCustomer(MenuItem item) {
if (!TextUtils.isEmpty(customerName.getText().toString()) &&
!TextUtils.isEmpty(customerNumber.getText().toString())) {
myDb.insertCustomer(
customerName.getText().toString(),
customerNumber.getText().toString(),
customerAddress.getText().toString());}
}
DbHelper数据：（已编辑）
package com.example.bharathduraiswamy.comboedittext;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBAdapter {
private static final String TAG = "DBAdapter"; //used for logging database version changes
/////////////////
//START : CUSTOMER DATA
/////////////////
// Field Names:
public static final String CUSTOMER_ROWID = "customer_id";
public static final String CUSTOMER_NAME = "customer_name";
public static final String CUSTOMER_CONTACT_NUMBER = "customer_contact_number";
public static final String CUSTOMER_CONTACT_ADDRESS = "customer_contact_address";
public static final String[] CUSTOMER_KEYS = new String[] {CUSTOMER_ROWID, CUSTOMER_NAME, CUSTOMER_CONTACT_NUMBER, CUSTOMER_CONTACT_ADDRESS};
// Column Numbers for each Field Name:
public static final int COL_CUSTOMER_ROWID = 0;
public static final int COL_CUSTOMER_NAME = 1;
public static final int COL_CUSTOMER_CONTACT_NUMBER = 2;
public static final int COL_CUSTOMER_CONTACT_ADDRESS = 3;
// DataBase info:
public static final String DATABASE_NAME = "dbLeder";
public static final String CUSTOMER_TABLE = "CUSTOMERLIST";
public static final int DATABASE_VERSION = 3; // The version number must be incremented each time a change to DB structure occurs.
//SQL statement to create database
private static final String DATABASE_CREATE_SQL =
"CREATE TABLE " + CUSTOMER_TABLE
+ " ("
+ CUSTOMER_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ CUSTOMER_NAME + " VARCHAR(255), "
+ CUSTOMER_CONTACT_NUMBER + " VARCHAR(255), "
+ CUSTOMER_CONTACT_ADDRESS + " VARCHAR(255));";
public final Context context;
public DatabaseHelper myDBHelper;
public SQLiteDatabase db;
/////////////////
//END : CUSTOMER DATA
/////////////////
public DBAdapter(Context ctx) {
this.context = ctx;
myDBHelper = new DatabaseHelper(context);
}
// Open the database connection.
public DBAdapter open() {
db = myDBHelper.getWritableDatabase();
return this;
}
// Close the database connection.
public void close() {
myDBHelper.close();
}
//onClick Method for Check - addCustomer
public long insertCustomer(String custName, String custContactNumber, String custContactAddress) {
ContentValues initialValues = new ContentValues();
initialValues.put(CUSTOMER_NAME, custName);
initialValues.put(CUSTOMER_CONTACT_NUMBER, custContactNumber);
initialValues.put(CUSTOMER_CONTACT_ADDRESS, custContactAddress);
// Insert the data into the database.
return db.insert(CUSTOMER_TABLE, null, initialValues);
}
// Delete a row from the database, by rowId (primary key)
public boolean deleteRow(long rowId) {
String where = CUSTOMER_ROWID + "=" + rowId;
return db.delete(CUSTOMER_TABLE, where, null) != 0;
}
public void deleteAll() {
Cursor c = getAllRows();
long rowId = c.getColumnIndexOrThrow(CUSTOMER_ROWID);
if (c.moveToFirst()) {
do {
deleteRow(c.getLong((int) rowId));
} while (c.moveToNext());
}
c.close();
}
// Return all data in the database.
public Cursor getAllRows() {
String where = null;
Cursor c = db.query(true, CUSTOMER_TABLE, CUSTOMER_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Get a specific row (by rowId)
public Cursor getRow(long rowId) {
String where = CUSTOMER_ROWID + "=" + rowId;
Cursor c = db.query(true, CUSTOMER_TABLE, CUSTOMER_KEYS,
where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Change an existing row to be equal to new data.
public boolean updateRow(long rowId, String custName, String custContactNumber, String custContactAddress) {
String where = CUSTOMER_ROWID + "=" + rowId;
ContentValues newValues = new ContentValues();
newValues.put(CUSTOMER_NAME, custName);
newValues.put(CUSTOMER_CONTACT_NUMBER, custContactNumber);
newValues.put(CUSTOMER_CONTACT_ADDRESS, custContactAddress);
// Insert it into the database.
return db.update(CUSTOMER_TABLE, newValues, where, null) != 0;
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase _db) {
_db.execSQL(DATABASE_CREATE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading application's database from version " + oldVersion
+ " to " + newVersion + ", which will destroy all old data!");
// Destroy old database:
_db.execSQL("DROP TABLE IF EXISTS" + CUSTOMER_TABLE);
onCreate(_db); // Recreates the onCreate()
}
}
}
答案 0 :(得分：1)
在你的代码中没有任何东西让我觉得错误。
您是否增加了DATABASE_VERSION字段以确保调用了onUpgradee（）方法？
如果您已经这样做，可能会尝试从您的设备卸载该应用。这将抹去现有的数据库。如果这项工作，那可能意味着你的onUpgrade（）方法不起作用。
祝你好运。编辑：检查你的onUpgrade（）方法。在＆＃34; EXISTS＆＃34;之后你没有空间。你需要一个，否则查询将无法正常工作。
答案 1 :(得分：0)
新的Logcat显示您遇到了不同的错误。我认为它告诉你的是你的表中至少应该有一个名为“_id”的列。
这是在Android上使用SQLite时必须具备的，因为一些便捷方法会查找此列名。
如果您搜索StackOverflow，您会发现一些答案告诉您，您可以对此行进行别名，而不必更改表格的设计，但我会说继续更改您的设计。