数据库SQLite的增删改查简单的实现，sqlite增删
*********************SQLite是比较小而功能比较全的关系型数据库，下面介绍一下SQLite数据库的使用方法，及增删改查操作。**************
***********代码如下：
**********************MaActivity.class*******************
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText ename;
private EditText ecolor;
private EditText eprice;
private Button look;
private Button add;
private MySQLite mySQLite;
private CarDao dao;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ename = (EditText) findViewById(R.id.ename);
ecolor = (EditText) findViewById(R.id.ecolor);
eprice = (EditText) findViewById(R.id.eprice);
look = (Button) findViewById(R.id.look);
add = (Button) findViewById(R.id.add);
mySQLite = new MySQLite(this);
dao = new CarDao(this);
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String name = ename.getText().toString().trim();
String color = ecolor.getText().toString().trim();
String price = eprice.getText().toString().trim();
if (TextUtils.isEmpty(name) && TextUtils.isEmpty(color)
&& TextUtils.isEmpty(price)) {
Toast.makeText(MainActivity.this, "不能为空", 0).show();
}
long addDate = dao.addDate(name, color, price);
if(addDate>0){
Toast.makeText(MainActivity.this, "添加成功", 0).show();
}
}
});
look.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainActivity.this, ShowActivity.class);
startActivity(intent);
finish();
}
});
}
}import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class MySQLite extends SQLiteOpenHelper {
public MySQLite(Context context) {
super(context, "h.db", null, 1);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("create table car(_id integer primary key autoincrement,name varchar(0),color varchar(0),price varchar(0))");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}**********************Car.class(Bean)*******************
public class Car {
private int _id;
private String name;
private String color;
private String price;
public int get_id() {
return _id;
}
public void set_id(int _id) {
this._id = _id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public Car(int _id, String name, String color, String price) {
super();
this._id = _id;
this.name = name;
this.color = color;
this.price = price;
}
public Car() {
super();
// TODO Auto-generated constructor stub
}
public Car(String name, String color, String price) {
super();
this.name = name;
this.color = color;
this.price = price;
}
}**********************CarDao.class*******************
import java.util.ArrayList;
import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class CarDao {
private MySQLite mySQLite;
private ArrayList<Car> list;
public CarDao(Context con) {
mySQLite = new MySQLite(con);
}
// 添加
public long addDate(String name, String color, String price) {
SQLiteDatabase db = mySQLite.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", name);
values.put("color", color);
values.put("price", price);
long insert = db.insert("car", null, values);
db.close();
return insert;
}
// 查询
@SuppressLint("NewApi")
public ArrayList<Car> query() {
list = new ArrayList<Car>();
SQLiteDatabase db = mySQLite.getWritableDatabase();
Cursor query = db.query(false, "car", null, null, null, null, null,
null, null, null);
while (query.moveToNext()) {
int _id = query.getInt(query.getColumnIndex("_id"));
String name = query.getString(query.getColumnIndex("name"));
String color = query.getString(query.getColumnIndex("color"));
String price = query.getString(query.getColumnIndex("price"));
list.add(new Car(_id, name, color, price));
}
db.close();
return list;
}
// 模糊查询
@SuppressLint("NewApi")
public ArrayList<Car> query(String ename) {
list = new ArrayList<Car>();
SQLiteDatabase db = mySQLite.getWritableDatabase();
Cursor query = db.query("car", null, "name like ?", new String[]{"%"+ename+"%"} , null, null, null);
while (query.moveToNext()) {
int _id = query.getInt(query.getColumnIndex("_id"));
String name = query.getString(query.getColumnIndex("name"));
String color = query.getString(query.getColumnIndex("color"));
String price = query.getString(query.getColumnIndex("price"));
list.add(new Car(_id, name, color, price));
}
db.close();
return list;
}
// 删除
public int delete(int _id) {
SQLiteDatabase db = mySQLite.getWritableDatabase();
int d = db.delete("car", "_id=?", new String[] { _id + "" });
db.close();
return d;
}
// 修改
public int update(int _id, String name, String color, String price) {
SQLiteDatabase db = mySQLite.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", name);
values.put("color", color);
values.put("price", price);
values.put("_id", _id);
int u = db.update("car", values, "_id=?", new String[] { _id + "" });
db.close();
return u;
}
}import java.util.ArrayList;
import android.app.Activity;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ShowActivity extends Activity {
private ListView listView;
private MySQLite mySQLite;
private CarDao dao;
private BaseAdapter adapter;
private ArrayList<Car> list;
private EditText sname;
private Button ss;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show);
listView = (ListView) findViewById(R.id.listView);
sname = (EditText) findViewById(R.id.sname);
ss = (Button) findViewById(R.id.ss);
mySQLite = new MySQLite(this);
dao = new CarDao(this);
list=new ArrayList<Car>();
list = dao.query();
SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(this,
R.layout.show, null, new String[] { "name", "color", "price" },
new int[] { R.id.name, R.id.color, R.id.price });
//搜索
ss.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(ShowActivity.this, "ddd", 0).show();
adapter.notifyDataSetChanged();
String name = sname.getText().toString().trim();
if(TextUtils.isEmpty(name)){
list=dao.query();
}
list=dao.query(name);
}
});
//长按删除
listView.setOnItemLongClickListener(new OnItemLongClickListener() {
private Builder builder;
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
final int position, long id) {
// TODO Auto-generated method stub
builder = new Builder(ShowActivity.this);
builder.setTitle("温馨提示").setMessage("确定要干掉它？").setNegativeButton("NO", null).setPositiveButton("YES", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
int delete = dao.delete(list.get(position).get_id());
if(delete>0){
Toast.makeText(ShowActivity.this, "删除成功", 0).show();
}
list.remove(position);
adapter.notifyDataSetChanged();
}
});
builder.show();
return false;
}
});
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String name = list.get(position).getName();
String color = list.get(position).getColor();
String price = list.get(position).getPrice();
int _id = list.get(position).get_id();
Intent intent = new Intent(ShowActivity.this, UpdateActivity.class);
intent.putExtra("name", name);
intent.putExtra("color", color);
intent.putExtra("price", price);
intent.putExtra("_id", _id);
startActivity(intent);
finish();
}
});
//适配器
listView.setAdapter(adapter = new BaseAdapter() {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View view = View
.inflate(ShowActivity.this, R.layout.show, null);
TextView name = (TextView) view.findViewById(R.id.name);
TextView color = (TextView) view.findViewById(R.id.color);
TextView price = (TextView) view.findViewById(R.id.price);
name.setText(list.get(position).getName());
color.setText(list.get(position).getColor());
price.setText(list.get(position).getPrice());
return view;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
});
//adapter.notifyDataSetChanged();
}
}
**********************UpdateActivity.class*******************
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class UpdateActivity extends Activity {
private EditText ename;
private EditText ecolor;
private EditText eprice;
private Button bao;
private Button fan;
private MySQLite mySQLite;
private CarDao dao;
private int _id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_update);
ename = (EditText) findViewById(R.id.ename);
ecolor = (EditText) findViewById(R.id.ecolor);
eprice = (EditText) findViewById(R.id.eprice);
bao = (Button) findViewById(R.id.bao);
fan = (Button) findViewById(R.id.fan);
Intent intent = getIntent();
String name = intent.getStringExtra("name");
String color = intent.getStringExtra("color");
String price = intent.getStringExtra("price");
_id = intent.getIntExtra("_id",0);
ename.setText(name);
ecolor.setText(color);
eprice.setText(price);
mySQLite = new MySQLite(this);
dao = new CarDao(this);
bao.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = ename.getText().toString().trim();
String color = ecolor.getText().toString().trim();
String price = eprice.getText().toString().trim();
if (TextUtils.isEmpty(name) && TextUtils.isEmpty(color)
&& TextUtils.isEmpty(price)) {
Toast.makeText(UpdateActivity.this, "不能为空", 0).show();
}
int u = dao.update(_id, name, color, price);
if(u>0){
Toast.makeText(UpdateActivity.this, "保存成功", 0).show();
}
}
});
fan.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(UpdateActivity.this, ShowActivity.class);
startActivity(intent);
finish();
}
});
}
}
*************************以下是所有布局*******
*************** activity_main.xml*********************
<RelativeLayout 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"
>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textSize="30dp"
android:text="添加汽车" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/textView1"
android:layout_marginTop="43dp"
android:text="名称：" />
<EditText
android:id="@+id/ename"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView2"
android:layout_marginLeft="17dp"
android:layout_toRightOf="@id/textView2"
android:ems="10" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/textView2"
android:layout_marginTop="52dp"
android:text="颜色：" />
<EditText
android:id="@+id/ecolor"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView3"
android:layout_alignLeft="@id/ename"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="价格：" />
<EditText
android:id="@+id/eprice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView4"
android:layout_alignLeft="@id/ecolor"
android:ems="10" />
<Button
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/eprice"
android:layout_below="@id/eprice"
android:layout_marginTop="81dp"
android:text="添加" />
<Button
android:id="@+id/look"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/add"
android:layout_alignRight="@id/eprice"
android:layout_marginRight="26dp"
android:text="查看" />
</RelativeLayout>*************** activity_show.xml*********************
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText
android1:id="@+id/sname"
android1:layout_width="wrap_content"
android1:layout_height="wrap_content"
android1:layout_alignParentLeft="true"
android1:layout_alignParentTop="true"
android1:layout_marginTop="32dp"
android1:ems="10" />
<Button
android1:id="@+id/ss"
android1:layout_width="wrap_content"
android1:layout_height="wrap_content"
android1:layout_alignBaseline="@id/sname"
android1:layout_alignBottom="@id/sname"
android1:layout_marginLeft="14dp"
android1:layout_toRightOf="@id/sname"
android1:text="搜索" />
<ListView
android1:id="@+id/listView"
android1:layout_width="match_parent"
android1:layout_height="wrap_content"
android1:layout_alignParentLeft="true"
android1:layout_below="@id/ss"
android1:layout_marginTop="18dp" >
</ListView>
</RelativeLayout>*************** activity_update.xml*********************
<RelativeLayout 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"
>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textSize="30dp"
android:text="修改汽车" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/textView1"
android:layout_marginTop="43dp"
android:text="名称：" />
<EditText
android:id="@+id/ename"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView2"
android:layout_marginLeft="17dp"
android:layout_toRightOf="@id/textView2"
android:ems="10" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/textView2"
android:layout_marginTop="52dp"
android:text="颜色：" />
<EditText
android:id="@+id/ecolor"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView3"
android:layout_alignLeft="@id/ename"
android:ems="10" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="价格：" />
<EditText
android:id="@+id/eprice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/textView4"
android:layout_alignLeft="@id/ecolor"
android:ems="10" />
<Button
android:id="@+id/bao"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/eprice"
android:layout_below="@id/eprice"
android:layout_marginTop="81dp"
android:text="保存" />
<Button
android:id="@+id/fan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/bao"
android:layout_alignRight="@id/eprice"
android:layout_marginRight="26dp"
android:text="返回" />
</RelativeLayout><?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="horizontal" >
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="@+id/color"
android:layout_marginLeft="30dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="@+id/price"
android:layout_marginLeft="30dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
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