在 SQLite 中插入记录时返回 -1

Question

这是我的SimpleDBAdapter Class，它封装了访问数据库的所有复杂性，内部类SimpleDBHelper负责CRUD操作，现在我在这里面临的问题是，当我部署代码时，表是正在创建，但我无法将值插入表中，id 正在返回 -1，表示在插入值时存在错误。

id = db.insert(TABLE_SIMPLETABLE_CLIENT1,null,contentvalues);

SimpleDBAdapter.java

import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.view.ViewGroup.MarginLayoutParams;

public class SimpleDBAdapter {
    // Define all the constants that are to used in the Program
    private static final String DATABASE_NAME = "SimpleDB.db";
    private static final String TABLE_SIMPLETABLE_CLIENT1 = "SimpleTable1";
    private static final int DATABASE_VERSION = 1;

    private static final String KEY_EMPLOYEE_ID = "Employee_id";
    private static final String KEY_EMPLOYEE_NAME = "Name";
    private static final String KEY_EMPLOYEE_DESIGNATION = "Designation";
    private static final String KEY_EMPLOYEE_MARITUALSTATUS = "Maritual Status";
    private static final String KEY_EMPLOYEE_DOJ = "Date of Joining";

    private static final String TAG = "SimpleDBAdapter";

    String CREATE_TABLE_SIMPLETABLE = "CREATE TABLE IF NOT EXISTS "
        + TABLE_SIMPLETABLE_CLIENT1
        + " (Employee_ID INTEGER PRIMARY KEY AUTOINCREMENT, "
        + "  Employee_Name VARCHAR(20)," + "  JoinedDateTime DATETIME,"
        + "  Designation VARCHAR(20),"
        + "  Maritual_Status BOOLEAN DEFAULT 'FALSE');";

    private final Context ctx;
    private SQLiteDatabase db;
    private SimpleDBHelper simpledbhelper;

    public SimpleDBAdapter(Context context) {
    Log.i(TAG,"SimpleDBAdapter Constructor");
     ctx = context;
     simpledbhelper = new SimpleDBHelper(ctx);
    }

      class SimpleDBHelper extends SQLiteOpenHelper {
        private static final String TAG = "SimpleDBHelper";
        public SimpleDBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    Log.i(TAG,"Calling.. super(context, DATABASE_NAME, null, DATABASE_VERSION)");
        }   

        @Override
        public void onCreate(SQLiteDatabase db) {
            Log.i(TAG,"Creating Table named CREATE_TABLE_SIMPLETABLE");
            db.execSQL(CREATE_TABLE_SIMPLETABLE);
               }



        @Override
        public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) {
            Log.w(TAG, "Upgarding from" + oldversion + "to" + newversion
                    + "could remove all the old data");
            db.execSQL("DROP TABLE IF EXISTS TABLE_SIMPLETABLE_CLIENT1");
            onCreate(db);
        }
    }

    //Opens the DB
    public void open() throws SQLException {
        Log.i(TAG,"Open() Called...");
        db = simpledbhelper.getWritableDatabase();
        simpledbhelper.onCreate(db);

    }

    //closes the DB
    public void close() {
        Log.i(TAG,"Close() Called...");
        simpledbhelper.close();
    }

    //inserting the values in to Table
    public long insertEntry(String Name,String Designation,Boolean MaritualStatus,String date){
        Log.i(TAG,"Insert Entry ()");
        long id = 0;
        try{
        ContentValues contentvalues = new ContentValues();
        contentvalues.put(KEY_EMPLOYEE_NAME, Name);
        contentvalues.put(KEY_EMPLOYEE_DOJ,date);
        contentvalues.put(KEY_EMPLOYEE_DESIGNATION, Designation);
        contentvalues.put(KEY_EMPLOYEE_MARITUALSTATUS, MaritualStatus);
        id = db.insert(TABLE_SIMPLETABLE_CLIENT1,null,contentvalues);
        }
        catch(Exception err){
            Log.i(TAG,"Error Encountered...");
            Log.e(TAG,String.valueOf(err).toString());
        }
        return id;
    }

}

在MainClass文件（DBHandler.java）中，我正在创建代码实例并调用该类的insert方法，如下所示，

DBHandler.java

导入android.app.Activity； 导入android.os.Bundle； 导入android.util.Log； 公共类 SimpleDBApplication 扩展 Activity { 私有静态最终字符串 TAG = "SimpleDBApplication"; /** 在第一次创建活动时调用。 */ @覆盖 公共无效 onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); 设置内容视图（R.layout.main）； SimpleDBAdapter DBAdapter = new SimpleDBAdapter(this); Log.i(TAG,"称为 SimpleDBAdapter"); //调用打开数据库 DBAdapter.open(); 长身份证； // 添加一个条目 id = DBAdapter.insertEntry("Vinayaka","CEO",false,"17-7-2010"); Log.w(TAG,"已插入元组"); Log.w(TAG," ID 的值：" +String.valueOf(id).toString()); //调用关闭数据库 DBAdapter.close(); } }

在此先感谢...

Answer 1

如果您使用insertOrThrow() 而不是insert() 并捕获异常，您可以获得具体原因，那么错误消息应该可以帮助您快速找出原因。

Answer 2

到目前为止，我可以看到，您的 ContentValues 键与列名不同，这应该是我记得的。

所以你的常量必须变成；

private static final String KEY_EMPLOYEE_ID = "Employee_ID";
private static final String KEY_EMPLOYEE_NAME = "Employee_Name";
private static final String KEY_EMPLOYEE_DESIGNATION = "Designation";
private static final String KEY_EMPLOYEE_MARITUALSTATUS = "Maritual_Status";
private static final String KEY_EMPLOYEE_DOJ = "JoinedDateTime";

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