android studio数据存储建立SQLite数据库怎么实现增删查改

今天就跟大家聊聊有关android studio数据存储建立SQLite数据库怎么实现增删查改，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

实验目的：

分别使用sqlite3工具和Android代码的方式建立SQLite数据库。在完成建立数据库的工作后，编程实现基本的数据库操作功能，包括数据的添加、删除和更新。

实验要求：

• 1.创建一个学生管理的应用，基本信息包含学生姓名，班级，学号。采用数据库存储这些信息。

• 2.应用应该至少包含信息录入和删除功能。

• 3.数据显示考虑采用ListView。

实验效果：

工程结构：

源代码：

DBAdapter.java

package com.example.shiyan6_sqlite;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.SQLiteException;import android.database.sqlite.SQLiteOpenHelper;import android.database.sqlite.SQLiteDatabase.CursorFactory;public class DBAdapter { private static final String DB_NAME = "student.db"; private static final String DB_TABLE = "peopleinfo"; private static final int DB_VERSION = 1; public static final String KEY_ID = "_id"; public static final String KEY_NAME = "name"; public static final String KEY_BANJI = "banji"; public static final String KEY_XUEHAO = "xuehao"; private SQLiteDatabase db; private final Context context; private DBOpenHelper dbOpenHelper; public DBAdapter(Context _context) {  context = _context; } public void close() {  if(db !=null)  {   db.close();   db=null;  } } public void open() throws SQLiteException {  dbOpenHelper = new DBOpenHelper(context, DB_NAME, null, DB_VERSION);  try {   db = dbOpenHelper.getWritableDatabase();  }  catch (SQLiteException ex) {   db = dbOpenHelper.getReadableDatabase();  } } public long insert(People people) {  ContentValues newValues = new ContentValues();  newValues.put(KEY_NAME, people.Name);  newValues.put(KEY_BANJI, people.Banji);  newValues.put(KEY_XUEHAO, people.Xuehao);  return db.insert(DB_TABLE, null, newValues); } public People[] queryAllData() {  Cursor results =  db.query(DB_TABLE, new String[] { KEY_ID, KEY_NAME, KEY_BANJI, KEY_XUEHAO},    null, null, null, null, null);  return ConvertToPeople(results); } public People[] queryOneData(long id) {  Cursor results =  db.query(DB_TABLE, new String[] { KEY_ID, KEY_NAME, KEY_BANJI, KEY_XUEHAO},    KEY_ID + "=" + id, null, null, null, null);  return ConvertToPeople(results); } @SuppressLint("Range") private People[] ConvertToPeople(Cursor cursor){  int resultCounts = cursor.getCount();  if (resultCounts == 0 || !cursor.moveToFirst()){   return null;  }  People[] peoples = new People[resultCounts];  for (int i = 0 ; i
People.java
package com.example.shiyan6_sqlite;public class People { public int ID = -1; public String Name; public String Banji; public String Xuehao; @Override public String toString(){  String result = "";  result += "ID：" + this.ID + "，";  result += "姓名：" + this.Name + "，";  result += "班级：" + this.Banji + "， ";  result += "学号：" + this.Xuehao;  return result; }}MainActivity.javapackage com.example.shiyan6_sqlite;import androidx.appcompat.app.AppCompatActivity;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    EditText e_xm,e_nl,e_sg,e_id;    TextView t_1;    Button b_add,b_allsee,b_clearsee,b_alldel,b_delid,b_seeid,b_updid;    DBAdapter dbAdapter;    SQLiteDatabase db;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        e_xm=findViewById(R.id.e_xm);        e_nl=findViewById(R.id.e_nl);        e_sg=findViewById(R.id.e_sg);        b_add=findViewById(R.id.b_add);        b_allsee=findViewById(R.id.b_allsee);        b_clearsee=findViewById(R.id.b_clearall);        b_alldel=findViewById(R.id.b_delall);        b_delid=findViewById(R.id.b_delid);        b_seeid=findViewById(R.id.b_seeid);        b_updid=findViewById(R.id.b_updid);        e_id=findViewById(R.id.e_id);        t_1=findViewById(R.id.t_1);        dbAdapter=new DBAdapter(this);        dbAdapter.open();        b_add.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                People t=new People();                t.Name=e_xm.getText().toString();                t.Banji=e_nl.getText().toString();                t.Xuehao=e_sg.getText().toString();                long colunm=dbAdapter.insert(t);                if (colunm == -1 ){                    t_1.setText("添加过程错误！");                } else {                    t_1.setText("成功添加数据，ID："+String.valueOf(colunm));                }            }        });        b_allsee.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                People [] peoples =dbAdapter.queryAllData();                if (peoples == null){                    t_1.setText("数据库中没有数据");                    return;                }                String t="数据库:\n";                for(int i=0;i0?"成功":"失败");                t_1.setText(msg);            }        });        b_seeid.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                int id=Integer.parseInt(e_id.getText().toString());                People people[]=dbAdapter.queryOneData(id);                if(people==null){                    t_1.setText("Id为"+id+"的记录不存在！");                }                else{                    t_1.setText("查询成功：\n"+people[0].toString());                }            }        });        b_updid.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                int id=Integer.parseInt(e_id.getText().toString());                People t=new People();                t.Name=e_xm.getText().toString();                t.Banji=e_nl.getText().toString();                t.Xuehao=e_sg.getText().toString();                long n=dbAdapter.updateOneData(id,t);                if (n<0){                    t_1.setText("更新过程错误！");                } else {                    t_1.setText("成功更新数据，"+String.valueOf(n)+"条");                }            }        });    }    @Override    protected void onStop() {        super.onStop();        dbAdapter.close();    }}
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