我刚刚开始开发一个Android应用程序，我遇到了这个错误，我不知道我哪里做错了。我想插入用户的登录详细信息，以便在用户成功登录后可以获取详细信息。
这是我的logcat：
09-01 01:08:13.874: E/JSON(294): {"tag":"login","success":1,"error":0,"uid":"5040ef44839a09.93014710","user":{"name":"a","cname":"a","email":"a@gmail.com","created_at":"2012-09-01 01:07:16","updated_at":null}}
09-01 01:08:14.034: E/Database(294): Error inserting uid=5040ef44839a09.93014710 created_at=2012- 09-01 01:07:16 email=a@gmail.com cname=a name=a
09-01 01:08:14.034: E/Database(294): android.database.sqlite.SQLiteException: table login has no column named cname: , while compiling: INSERT INTO login(uid, created_at, email, cname, name) VALUES(?, ?, ?, ?, ?);
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:36)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1145)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1536)
09-01 01:08:14.034: E/Database(294): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1410)
09-01 01:08:14.034: E/Database(294): at com.stts.sparetimetradingsystem.library.DatabaseHandlerEmployer.addUser(DatabaseHandlerEmployer.java:83)
09-01 01:08:14.034: E/Database(294): at com.stts.sparetimetradingsystem.employer.LoginEmployerActivity$LoginEmployer$1.run(LoginEmployerActivity.java:134)
09-01 01:08:14.034: E/Database(294): at android.os.Handler.handleCallback(Handler.java:587)
09-01 01:08:14.034: E/Database(294): at android.os.Handler.dispatchMessage(Handler.java:92)
09-01 01:08:14.034: E/Database(294): at android.os.Looper.loop(Looper.java:123)
09-01 01:08:14.034: E/Database(294): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-01 01:08:14.034: E/Database(294): at java.lang.reflect.Method.invokeNative(Native Method)
09-01 01:08:14.034: E/Database(294): at java.lang.reflect.Method.invoke(Method.java:521)
09-01 01:08:14.034: E/Database(294): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-01 01:08:14.034: E/Database(294): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-01 01:08:14.034: E/Database(294): at dalvik.system.NativeStart.main(Native Method)
09-01 01:08:15.174: E/AndroidRuntime(294): FATAL EXCEPTION: main
09-01 01:08:15.174: E/AndroidRuntime(294): java.lang.RuntimeException: Unable to destroy activity {com.stts.sparetimetradingsystem/com.stts.sparetimetradingsystem.employer.HomepageEmployerActivity}: java.lang.NullPointerException
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3655)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3673)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread.access$2900(ActivityThread.java:125)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.os.Handler.dispatchMessage(Handler.java:99)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.os.Looper.loop(Looper.java:123)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-01 01:08:15.174: E/AndroidRuntime(294): at java.lang.reflect.Method.invokeNative(Native Method)
09-01 01:08:15.174: E/AndroidRuntime(294): at java.lang.reflect.Method.invoke(Method.java:521)
09-01 01:08:15.174: E/AndroidRuntime(294): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-01 01:08:15.174: E/AndroidRuntime(294): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-01 01:08:15.174: E/AndroidRuntime(294): at dalvik.system.NativeStart.main(Native Method)
09-01 01:08:15.174: E/AndroidRuntime(294): Caused by: java.lang.NullPointerException
09-01 01:08:15.174: E/AndroidRuntime(294): at com.stts.sparetimetradingsystem.employer.HomepageEmployerActivity.onDestroy(HomepageEmployerActivity.java:340)
09-01 01:08:15.174: E/AndroidRuntime(294): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3642)
09-01 01:08:15.174: E/AndroidRuntime(294): ... 11 more
这是我的SQLiteDatabase代码 package com.stts.sparetimetradingsystem.library;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHandlerEmployer extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "stts";
// Login table name
private static final String TABLE_LOGIN = "login";
// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_CNAME = "cname";
private static final String KEY_EMAIL = "email";
private static final String KEY_UID = "uid";
private static final String KEY_CREATED_AT = "created_at";
public DatabaseHandlerEmployer(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase dbe) {
// ORIGINAL
/*String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_NAME + " TEXT,"
+ KEY_CNAME + " TEXT,"
+ KEY_EMAIL + " TEXT UNIQUE,"
+ KEY_UID + " TEXT,"
+ KEY_CREATED_AT + " TEXT" + ")";
dbe.execSQL(CREATE_LOGIN_TABLE);*/
// TESTING HERE
dbe.execSQL("CREATE TABLE " + TABLE_LOGIN + "("
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_NAME + " TEXT NOT NULL,"
+ KEY_CNAME + " TEXT,"
+ KEY_EMAIL + " TEXT UNIQUE NOT NULL,"
+ KEY_UID + " TEXT NOT NULL,"
+ KEY_CREATED_AT + " TEXT NOT NULL);"
);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase dbe, int oldVersion, int newVersion) {
// Drop older table if existed
dbe.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);
// Create tables again
onCreate(dbe);
}
/**
* Storing user details in database
* */
//public void addUser(String name, String email, String uid, String created_at) {
public void addUser(String name, String cname, String email, String uid, String created_at) {
SQLiteDatabase dbe = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, name); // Name
values.put(KEY_CNAME, cname); // CName
values.put(KEY_EMAIL, email); // Email
values.put(KEY_UID, uid); // UID
values.put(KEY_CREATED_AT, created_at); // Created At
// Inserting Row
dbe.insert(TABLE_LOGIN, null, values);
dbe.close(); // Closing database connection
}
/**
* Getting user data from database
* */
/*public HashMap<String, String> getUserDetails(){
HashMap<String,String> user = new HashMap<String,String>();
String selectQuery = "SELECT * FROM " + TABLE_LOGIN;
SQLiteDatabase dbe = this.getReadableDatabase();
Cursor cursor = dbe.rawQuery(selectQuery, null);
// Move to first row
cursor.moveToFirst();
if(cursor.getCount() > 0){
user.put("name", cursor.getString(1));
user.put("cname", cursor.getString(2));
user.put("email", cursor.getString(3));
user.put("uid", cursor.getString(4));
user.put("created_at", cursor.getString(5));
}
cursor.close();
dbe.close();
// return user
return user;
}*/
public String getCName()
{
String[] col = new String[] {KEY_NAME};
SQLiteDatabase dbe = this.getReadableDatabase();
Cursor c = dbe.query(TABLE_LOGIN, col, null, null, null, null, null);
String res = "";
int iCname = c.getColumnIndex(KEY_NAME);
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{
res = res + c.getString(iCname);
}
c.close();
dbe.close();
return res;
}
public String getEmail()
{
String[] col = new String[] {KEY_EMAIL};
SQLiteDatabase dbe = this.getReadableDatabase();
Cursor c = dbe.query(TABLE_LOGIN, col, null, null, null, null, null);
String res = "";
int iEmail = c.getColumnIndex(KEY_EMAIL);
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{
res = res + c.getString(iEmail);
}
c.close();
dbe.close();
return res;
}
/**
* Getting user login status
* return true if rows are there in table
* */
public int getRowCount() {
String countQuery = "SELECT * FROM " + TABLE_LOGIN;
SQLiteDatabase dbe = this.getReadableDatabase();
Cursor cursor = dbe.rawQuery(countQuery, null);
int rowCount = cursor.getCount();
dbe.close();
cursor.close();
// return row count
return rowCount;
}
/**
* Re crate database
* Delete all tables and create them again
* */
public void resetTables(){
SQLiteDatabase dbe = this.getWritableDatabase();
// Delete All Rows
dbe.delete(TABLE_LOGIN, null, null);
dbe.close();
}
}
我想知道导致错误的问题在哪里。请帮忙！谢谢！
答案 0 :(得分：2)
更改架构时，如添加NOT NULL约束或可能添加列KEY_CNAME，您需要通知OpenHelper这些更改。它不会自动找到它们。最简单的方法是升级数据库：
private static final int DATABASE_VERSION = 2;
您正尝试将"5040ef44839a09.93014710"插入INTEGER PRIMARY KEY列。通常，SQLite仅使用数据类型亲缘关系，但SQLite对主键使用严格的数据类型匹配。
这会抛出一条消息："Error: datatype mismatch"