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  • 读信息

    package com.example.ccc;
    
    import android.content.Context;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteDatabase.CursorFactory;
    import android.database.sqlite.SQLiteOpenHelper;
     
    public class StuOpenHelper extends SQLiteOpenHelper{
     
        public StuOpenHelper(Context context) {
            super(context, "stu.db", null, 5);
            // TODO Auto-generated constructor stub
        }
     
        @Override
        public void onCreate(SQLiteDatabase db) {
            System.out.println("第一次创建");
            String sql = "CREATE TABLE stu (_id integer PRIMARY KEY AUTOINCREMENT,USERNAME VARCHAR(20),PASSWORD  VARCHAR(20))";
            db.execSQL(sql);
             
        }
     
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
                System.out.println("更新"+oldVersion+"  "+newVersion);
                if(oldVersion==5 && newVersion==6) {
                    String sql = "CREATE TABLE bj (_id integer PRIMARY KEY AUTOINCREMENT,CLASSNAME VARCHAR(20))";
                    db.execSQL(sql);
                }
     
        }
    }
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="用户名:"
        android:textSize="30dp"
        android:layout_marginTop="60dp"
        />
    <EditText
        android:id="@+id/et1"
        android:layout_width="600dp"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/tv1"
        android:layout_marginTop="50dp"
        android:textSize="30dp"
        />
    
    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="密码:"
        android:textSize="30dp"
        android:layout_marginTop="50dp"
        android:layout_below="@+id/tv1"
        />
    <EditText
        android:id="@+id/et2"
        android:layout_width="600dp"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/tv2"
        android:layout_marginTop="30dp"
        android:textSize="30dp"
        android:layout_below="@+id/et1"
    
        />
    
    
        <Button
            android:layout_marginTop="80dp"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:text="注册"
            android:textSize="50dp"
            android:layout_below="@+id/et2"
            android:layout_centerHorizontal="true"
            android:onClick="click"
            />
    </RelativeLayout>
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  • 原文地址:https://www.cnblogs.com/wzm7282/p/14109069.html
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