Android數據庫的SQLite增刪改查

時間 2019-11-10

原文原文鏈接

這個月的17日，就要去大連比賽了，是今年的職業技能大賽，整理了一下本身過去寫過的代碼，這個是Android數據庫的知識，涉及數據庫的增刪改查，代碼很普通，稍有Android基礎的，估計都能看懂，無邪本着互聯網精神，但願你們一塊兒進步，大神直接飄過，勿噴。。。 android

主界面的代碼： sql

package com.example.sqlitetestdemo; 數據庫

import android.os.Bundle;
import android.app.Activity;
import
android.content.ContentValues;
import android.content.Intent;
import
android.database.Cursor;
import
android.database.sqlite.SQLiteDatabase;
import
android.support.v4.widget.SimpleCursorAdapter;
import
android.view.Menu;
import android.view.View;
import
android.view.View.OnClickListener;
import android.widget.Button;
import
android.widget.ListView;
import android.widget.SimpleAdapter; app

public class MainActivity extends Activity {
private Button
skip;
private ListView list;
private SQLiteDatabase
mydb=null;
private Cursor cursor;
public static String
Name=null;
public static String Text=null;
    public static String
DataBase_Name="StudentDataBase.db";
    public static String
Table_Name="Student";
    public static String Create_Table="create table if
not exists "+Table_Name+"(_id integer primary key autoincrement
,name,text)";
protected void onCreate(Bundle savedInstanceState)
{
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main_activity);
  //建立數據庫
  mydb=openOrCreateDatabase(DataBase_Name,
MODE_PRIVATE, null);
  mydb.execSQL(Create_Table);//建立表
  ContentValues
values=new ContentValues();
  values.put("name",
"王曉讓");
  values.put("text", "2011237144   男
");
  mydb.insert(Table_Name, null,
values);//插入數據
  //在ListView裏顯示數據
  this.showText();
  //skip按鈕的監聽事件
  skip=(Button)
findViewById(R.id.saveto);
  skip.setOnClickListener(new OnClickListener()
{
   public void onClick(View v) {
   Intent intent=new
Intent(MainActivity.this,MySQLite.class);
   startActivityForResult(intent,
6);
   }
  });

}

protected void
onActivityResult(int requestCode, int resultCode, Intent data) {
  switch(
resultCode){
  case
RESULT_OK:
   cursor.requery();
   //重繪
   list.invalidateViews();
   break;
   default:
    break;
  }
  super.onActivityResult(requestCode,
resultCode, data);
} 佈局

public void showText(){
  //獲取數據庫的全部數據

cursor=mydb.query(Table_Name,new String[]{"_id","name","text"}, null,null, null,
null,null);
  list=(ListView) findViewById(R.id.listView1);

SimpleCursorAdapter simple=new SimpleCursorAdapter(this, R.layout.show, cursor,
new String[]{"name","text"}, new
int[]{R.id.textView1,R.id.textView2});
  //綁定適配器
  list.setAdapter(simple);

}
public
boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds
items to the action bar if it is
present.
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return
true;
} this

} spa

Android數據庫操做的代碼： sqlite

package com.example.sqlitetestdemo; xml

import android.app.Activity;
import
android.content.ContentValues;
import
android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import
android.view.View;
import android.view.View.OnClickListener;
import
android.widget.Button;
import android.widget.EditText; 事件

public class MySQLite extends Activity{
   private SQLiteDatabase
mydb=null;
   private Button add;
   private Button modify;
   private
Button delete;
   private EditText name;
   private EditText
content;
   private static String DataBase_Name="StudentDataBase.db";

private static String Table_Name="Student";
   private static String
Name="name";
   private static String Text="text";
   private static
String Create_Table="create table if not exists "+Table_Name+ "(_id integer
primary key autoincrement ,name,text)";
protected void onCreate(Bundle
savedInstanceState)
{
  super.onCreate(savedInstanceState);
  setContentView(R.layout.context_edit);

  //初始化控件
  this.init();
}
//初始化控件
public
void init(){
  name=(EditText)
findViewById(R.id.name);
  content=(EditText)
findViewById(R.id.content);
  add=(Button)
findViewById(R.id.button1);
  modify=(Button)
findViewById(R.id.button2);
  delete=(Button)
findViewById(R.id.button3);
  add.setOnClickListener(new
ButtonListener());
  modify.setOnClickListener(new
ButtonListener());
  delete.setOnClickListener(new
ButtonListener());
}
//按鈕的監聽事件
class ButtonListener implements
OnClickListener{
  public void onClick(View v)
{
  switch(v.getId()){
  case
R.id.button1:
   //打開數據庫
   mydb=openOrCreateDatabase(DataBase_Name,
MODE_PRIVATE, null);
   ContentValues cv=new
ContentValues();
   //存入鍵值對
   cv.put(Name,name.getText().toString()
);
   cv.put(Text,
content.getText().toString());
   mydb.insert(Table_Name, null,
cv);//插入數據,若是不成功返回-1
   //設置參數
   setResult(RESULT_OK);
   mydb.close();//關閉資源
   //銷燬視圖
   finish();
   break;
  case
R.id.button3:
   //打開數據庫
   mydb=openOrCreateDatabase(DataBase_Name,
MODE_PRIVATE, null);
   String whereClause="name=?";
   String[]
whereArgs={name.getText().toString()};
   //刪除數據
   mydb.delete(Table_Name,
whereClause,
whereArgs);
   //設置參數
   setResult(RESULT_OK);
   mydb.close();//關閉資源
   //銷燬視圖
   finish();
   break;
  case
R.id.button2:
   //打開數據庫
   mydb=openOrCreateDatabase(DataBase_Name,
MODE_PRIVATE, null);
   ContentValues values=new
ContentValues();
   values.put(Name,
name.getText().toString());
   values.put(Text,
content.getText().toString());
   String
whereClause1="name=?";
   String[]
whereArgs1={name.getText().toString()};
   //修改數據
   mydb.update(Table_Name,
values, whereClause1,
whereArgs1);
   //設置參數
   setResult(RESULT_OK);
   mydb.close();//關閉資源
   //銷燬視圖
   finish();
   break;
   default:
    break;
  }
  }

}

}

主界面的佈局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"
    android:orientation="vertical"
>