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新增数据库连接

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master
FinalJcsp 2 years ago
parent 72b1162d2f
commit be7a4d2eea
7 changed files with 186 additions and 137 deletions
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9
app/src/main/java/com/example/myapplication/MainActivity.java
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@ -12,6 +12,7 @@ import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
Button loginB, newUser;
EditText usernameET, passwordET;
SqliteDbManager instance;
private static final String correctName = "admin";
private static final String correctPassword = "rootadmin";
@ -23,14 +24,13 @@ public class MainActivity extends AppCompatActivity {
initView();
loginB.setOnClickListener(v -> {
if (submit()) {
System.out.println(usernameET.getText());
Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG).show();
Intent intent = new Intent();
ComponentName componentName = new ComponentName(MainActivity.this, InfoActivity.class);
intent.setComponent(componentName);
intent.putExtra("username", usernameET.getText());
startActivity(intent);
}else{
} else {
Toast.makeText(MainActivity.this, "账号或密码输入错误", Toast.LENGTH_LONG).show();
}
});
@ -50,10 +50,13 @@ public class MainActivity extends AppCompatActivity {
usernameET = findViewById(R.id.username);
passwordET = findViewById(R.id.password);
newUser = findViewById(R.id.newUser);
instance = SqliteDbManager.getInstance();
}
boolean submit() {
return getUsername().equals(correctName) && getPassword().equals(correctPassword);
instance.setSqliteDbOpen(this);
return instance.queryTb("person", getUsername(), getPassword());
// return getUsername().equals(correctName) && getPassword().equals(correctPassword);
}
String getUsername() {

10
app/src/main/java/com/example/myapplication/MainActivity2.java
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@ -43,6 +43,8 @@ public class MainActivity2 extends Activity {
private Button btnReg, btnYear, back;
private List<String> cityList;
SqliteDbManager instance = SqliteDbManager.getInstance();
//JSONObject对象，处理一个一个的对象
//JSONObject对象，处理一个一个集合或者数组
//保存带集合的json字符串
@ -75,6 +77,7 @@ public class MainActivity2 extends Activity {
Intent intent = new Intent(MainActivity2.this, MainActivity.class);
intent.putExtra("username", edtNewUserName.getText().toString());
intent.putExtra("password", edtPwd1.getText().toString());
this.register();
startActivity(intent);
});
builder.setNegativeButton("否", (dialog, which) -> isYes = false);
@ -103,8 +106,13 @@ public class MainActivity2 extends Activity {
});
}
private void register(){
String username = edtNewUserName.getText().toString();
String password = edtPwd1.getText().toString();
instance.insertTb("person", username, password);
}
void initView() {
instance.setSqliteDbOpen(this);
edtNewUserName = this.findViewById(R.id.edtNewUserName);
edtPwd1 = this.findViewById(R.id.edtPwd);
edtPwd2 = this.findViewById(R.id.edtSndPwd);

9
app/src/main/java/com/example/myapplication/PeopleActivity.java
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@ -1,15 +1,10 @@
package com.example.myapplication;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class PeopleActivity extends Activity {
private Button ylp, qxs, lsg, tyy, djx;
@ -19,7 +14,7 @@ public class PeopleActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.people);
setContentView(R.layout.test);
initView();
ylp.setOnClickListener(v -> {
imageView.setImageResource(R.drawable.ylp);
@ -50,6 +45,6 @@ public class PeopleActivity extends Activity {
tyy = findViewById(R.id.tyy);
djx = findViewById(R.id.djx);
textView = findViewById(R.id.peopletext);
imageView = findViewById(R.id.peoplezp);
imageView = findViewById(R.id.peopleImage);
}
}

34
app/src/main/java/com/example/myapplication/PersonSQLiteOpenHelper.java
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@ -0,0 +1,34 @@
package com.example.myapplication;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.security.AccessControlContext;
public class PersonSQLiteOpenHelper extends SQLiteOpenHelper {
/**
* 构造方法
* @param context
*/
public PersonSQLiteOpenHelper(Context context) {
super(context,"person",null,1);
}
/**
* 数据库第一次创建完成的回调
*/
@Override
public void onCreate(SQLiteDatabase db) {
// String sql="create table person (id integer primary key autoincrement,name varchar(10) not null default '')";
String sql="create table person(id integer primary key autoincrement,username varchar(50),password varchar(50),sex varchar(50),address varchar(50))";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}

134
app/src/main/java/com/example/myapplication/SqliteDbManager.java
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@ -0,0 +1,134 @@
package com.example.myapplication;
import android.annotation.SuppressLint;
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 SqliteDbManager
{
private static SqliteDbManager mInstance = null;
private SQLiteDatabase mDb = null;
private PersonSQLiteOpenHelper mDbHelper = null;
public static SqliteDbManager getInstance()
{
if (mInstance == null)
{
mInstance = new SqliteDbManager();
}
return mInstance;
}
public void setSqliteDbOpen(Context context)
{
mDbHelper = new PersonSQLiteOpenHelper(context.getApplicationContext());
mDb = mDbHelper.getWritableDatabase();
}
public void insertTb(String tbName, String username, String password)
{
openDb();
//方法一：
ContentValues contentValues = new ContentValues();
contentValues.put("username",username);
contentValues.put("password",password);
// contentValues.put("sex","男");
mDb.insert(tbName,null,contentValues);
//方法二：
// mDb.execSQL("insert into "+tbName+" (username,password) values ('李四',20)");
// mDb.execSQL("insert into "+tbName+" (name,age,sex) values ('王五',22,'女')");
// mDb.execSQL("insert into "+tbName+" (name,age,sex) values ('哈利',21,'男')");
closeDb();
}
public void deleteTb(String tbName)
{
openDb();
//方法一：
mDb.delete(tbName,"name=?",new String[]{"zhangsan"});
//方法二：
mDb.execSQL("delete from "+tbName+" where name = '李四'");
closeDb();
}
public void updateTb(String tbName)
{
openDb();
//方法一：
ContentValues contentValues = new ContentValues();
contentValues.put("name","隔壁老王");
contentValues.put("sex","男");
mDb.update(tbName,contentValues,"name=?",new String[]{"王五"});
//方法二：
mDb.execSQL("update "+tbName+" set name = '哈利波特',age = '16' where name = '哈利'");
closeDb();
}
public boolean queryTb(String tbName, String username, String password)
{
openDb();
// //方法一：
// Cursor cursor = mDb.query(tbName, new String[]{"name","sex","age"}, "name=?", new String[]{"隔壁老王"}, null, null, null);
// //将光标移动到下一行，从而判断该结果集是否还有下一条数据；如果有则返回true，没有则返回false
// if (null != cursor)
// {
// while (cursor.moveToNext())
// {
// String name = cursor.getString(cursor.getColumnIndex("name"));
// int age = cursor.getInt(cursor.getColumnIndex("age"));
// String sex = cursor.getString(cursor.getColumnIndex("sex"));
// Log.i("????","name = "+name+"; age = "+age+"; sex = "+sex);
// }
// cursor.close();
// }
//方法二：使用sql语句
Cursor rawQuery = mDb.rawQuery("select * from " + tbName+" where username=? and password=?", new String[]{username,password});
// Cursor rawQuery = mDb.rawQuery("select * from " + tbName,null);
if (null != rawQuery)
{
while (rawQuery.moveToNext())
{
@SuppressLint("Range") String _id = rawQuery.getString(rawQuery.getColumnIndex("id"));
@SuppressLint("Range") String name = rawQuery.getString(rawQuery.getColumnIndex("username"));
// int age = rawQuery.getInt(rawQuery.getColumnIndex("age"));
// String sex = rawQuery.getString(rawQuery.getColumnIndex("sex"));
Log.i("????","_id = "+_id+"; name = "+name);
return true;
}
rawQuery.close();
}
closeDb();
return false;
}
/**
* 创建或打开一个可以读的数据库
*/
private void openDb() {
if (this.mDbHelper != null) {
try {
mDb = mDbHelper.getWritableDatabase();
} catch (Exception e) {
mDb = mDbHelper.getReadableDatabase();
e.printStackTrace();
}
}
}
/**
* 关闭数据库
*/
private void closeDb() {
try {
if (mDb != null) {
mDb.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

120
app/src/main/res/layout/people.xml
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@ -1,120 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="10dp">
<!-- <ImageView-->
<!-- android:layout_width="wrap_content"-->
<!-- android:layout_height="match_parent"-->
<!-- android:src="@drawable/nike"></ImageView>-->
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<FrameLayout
android:id="@+id/fl_left"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/ylp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:text="孔子"
android:textColor="@color/black"
android:textSize="20dp"></Button>
<Button
android:id="@+id/djx"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:text="宋庆龄"
android:textColor="@color/black"
android:textSize="20dp"></Button>
<Button
android:id="@+id/tyy"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:text="宋美龄"
android:textColor="@color/black"
android:textSize="20dp"></Button>
<Button
android:id="@+id/lsg"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:text="胡适"
android:textColor="@color/black"
android:textSize="20dp"></Button>
<Button
android:id="@+id/qxs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:text="钱学森"
android:textColor="@color/black"
android:textSize="20dp"></Button>
</LinearLayout>
</FrameLayout>
<FrameLayout
android:id="@+id/fl_right"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="2"
android:background="@color/nike">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="@+id/kz"
android:layout_width="100dp"
android:layout_height="130dp"
android:src="@drawable/kz"></ImageView>
<TextView
android:id="@+id/peopletext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="孔子（公元前551年-公元前479年4月11日），子姓，孔氏，名丘，字仲尼，春秋时期鲁国陬邑（今山东省曲阜市）人，祖籍宋国栗邑（今河南省夏邑县），中国古代伟大的思想家、政治家、教育家，儒家学派创始人、“大成至圣先师”。"
android:textSize="15dp"></TextView>
</LinearLayout>
</FrameLayout>
<!-- <ListView-->
<!-- android:id="@+id/lv"-->
<!-- android:layout_width="match_parent"-->
<!-- android:layout_height="wrap_content" />-->
</LinearLayout>
</LinearLayout>

7
app/src/main/res/layout/test.xml
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@ -96,7 +96,7 @@
android:orientation="vertical">
<ImageView
android:id="@+id/peoplezp"
android:id="@+id/peopleImage"
android:layout_width="100dp"
android:layout_height="130dp"
android:src="@drawable/ylp"></ImageView>
@ -111,10 +111,5 @@
</LinearLayout>
</FrameLayout>
<!-- <ListView-->
<!-- android:id="@+id/lv"-->
<!-- android:layout_width="match_parent"-->
<!-- android:layout_height="wrap_content" />-->
</LinearLayout>
</LinearLayout>

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