Question

我正在尝试创建一个需要注册表单的Android应用程序。我已经做了一些事情，但现在的问题是，当用户输入密码和确认密码相同时，为了点击注册按钮，应用程序停止不幸。但是当我提供不同的密码时，它运行良好。以下是我的代码：

TableData.java

import android.provider.BaseColumns;


public class TableData {

public TableData()
{

}

public static abstract class TableInfo implements BaseColumns
{
    public static final String USER_NAME = "user_name";
    public static final String USER_PASS = "user_pass";
    public static final String DATABASE_NAME = "user_info";
    public static final String TABLE_NAME = "reg_info";
    }
}

DatabaseOperations.java

import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;


public class DatabaseOperations extends SQLiteOpenHelper{
    public static final int database_version = 1;
    public String CREATE_QUERY = "CREATE_TABLE" + TableData.TableInfo.TABLE_NAME+"("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_PASS+" TEXT );" ;


public DatabaseOperations(Context context) {


    super(context, TableData.TableInfo.DATABASE_NAME, null, database_version);
    Log.d("Database operations", "Database Created");
}

@Override
public void onCreate(SQLiteDatabase sdb) {

    sdb.execSQL(CREATE_QUERY);
    Log.d("Database operations", "Table Created");
}

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

}

public void putInformation(DatabaseOperations dop, String name, String pass)
{
    SQLiteDatabase SQ = dop.getWritableDatabase();
    ContentValues cv = new ContentValues();
    cv.put(TableData.TableInfo.USER_NAME, name);
    cv.put(TableData.TableInfo.USER_PASS, pass);
    long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);


    Log.d("Database operations", "One Raw Inserted");
}

}

和register.java

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class register extends AppCompatActivity {
    EditText USER_NAME, USER_PASS, CON_PASS;
    String user_name, user_pass, con_pass;
    Button REG;
    Context ctx = this;
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        USER_NAME = (EditText) findViewById(R.id.reg_user);
        USER_PASS = (EditText) findViewById(R.id.reg_pass);
        CON_PASS = (EditText) findViewById(R.id.con_pass);
        REG = (Button) findViewById(R.id.user_reg);
        REG.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                user_name = USER_NAME.getText().toString();
                user_pass = USER_PASS.getText().toString();
                con_pass = CON_PASS.getText().toString();

            if (!(user_pass.equals(con_pass)))
            {
                Toast.makeText(getBaseContext(),"Passwords are not matching",Toast.LENGTH_LONG).show();
                USER_NAME.setText("");
                USER_PASS.setText("");
                CON_PASS.setText("");

            }
            else
            {
                DatabaseOperations DB = new DatabaseOperations(ctx);
                DB.putInformation(DB, user_name, user_pass);
                Toast.makeText(getBaseContext(),"Registration is Successfully done",Toast.LENGTH_LONG).show();
                finish();

            }

        }

    });
}
}

请给我一些建议如何解决，谢谢！

Answer 1

你创建表的sql是错误的，替换

    public String CREATE_QUERY = "CREATE_TABLE" + TableData.TableInfo.TABLE_NAME+"("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_PASS+" TEXT );" ;

与

    public String CREATE_QUERY = "CREATE TABLE" + TableData.TableInfo.TABLE_NAME+"("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_PASS+" TEXT );" ;

Answer 2

这应该适合你，我自己做了。

TableData.java

 import android.provider.BaseColumns;

    public class TableData {

        public TableData() {
        }

        public static abstract class TableInfo implements BaseColumns
        {
            public static final String USER_NAME = "user_name";
            public static final String USER_PASS = "user_password";
            public static final String DATABASE_NAME = "user_info";
            public static final String TABLE_NAME = "reg_info";


        }
    }

DatabaseOperations.java

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 DatabaseOperations extends SQLiteOpenHelper {
    public static final int database_version = 1;
    public String CREATE_QUERY = "CREATE TABLE "+ TableData.TableInfo.TABLE_NAME+
            "(" + TableData.TableInfo.USER_NAME+ " TEXT," + TableData.TableInfo.USER_PASS+ " TEXT );";

    public DatabaseOperations(Context context) {
        super(context, TableData.TableInfo.DATABASE_NAME, null, database_version);
        Log.d("MYLOG", "database created");
    }

    public void onCreate(SQLiteDatabase sdb){
        sdb.execSQL(CREATE_QUERY);
        Log.d("MYLOG", "table created");

    }
    public void onUpgrade(SQLiteDatabase arg0,int arg1,int arg2){

    }

    public void putInformation(DatabaseOperations dop,String name,String pass){
        SQLiteDatabase sq = dop.getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put(TableData.TableInfo.USER_NAME,name);
        cv.put(TableData.TableInfo.USER_PASS, pass);

        long k = sq.insert(TableData.TableInfo.TABLE_NAME,null,cv);
        Log.d("MYLOG", "one row inserted" + k);


        }
}

Register.java

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class RegisterActivity extends Activity{
    EditText USER_NAME,USER_PASS,CON_PASS;
    String user_name, user_pass,con_pass;
    Button REG;

    Context ctx = this;

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

        USER_NAME = (EditText) findViewById(R.id.reg_user);
        USER_PASS = (EditText)findViewById(R.id.reg_pass);
        CON_PASS = (EditText)findViewById(R.id.con_pass);
        REG = (Button)findViewById(R.id.user_reg);

        REG.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                user_name = USER_NAME.getText().toString();
                user_pass = USER_PASS.getText().toString();
                con_pass = CON_PASS.getText().toString();

                if(!(user_pass.equals(con_pass))){
                    Toast.makeText(getBaseContext(),"Passwords are not matching", Toast.LENGTH_LONG).show();
                    USER_NAME.setText("");
                    USER_PASS.setText("");
                    CON_PASS.setText("");
                }else{
                    DatabaseOperations DB = new DatabaseOperations(ctx);
                    DB.putInformation(DB,user_name,user_pass);
                    Toast.makeText(getBaseContext(),"Registration success", Toast.LENGTH_LONG).show();
                    finish();
                }
            }
        });

    }
}

如何在数据库中存储数据

2 个答案: