安卓的小型sql数据库代码,Java代码库,德仔网

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【Java】安卓的小型sql数据库
作者:蜗牛在路上 / 发布于2014/12/19/ 779

	package com.example.sql;
	import java.util.ArrayList;
	import java.util.List;
	
	import android.annotation.SuppressLint;
	import android.app.Activity;
	import android.app.AlertDialog;
	import android.content.ContentValues;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.database.Cursor;
	import android.database.sqlite.SQLiteDatabase;
	import android.os.Bundle;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.ArrayAdapter;
	import android.widget.Button;
	import android.widget.EditText;
	import android.widget.ListView;
	import android.widget.TextView;
	@SuppressLint("SdCardPath")
	public class SplActivity extends Activity implements OnClickListener{
	 private Button insertBtn, selectBtn,displayBtn;
	 private ListView mListView;
	 private SQLiteDatabase db;
	
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.sql_activity);
	 mListView=new ListView(this);
	 BtnInit();
	 OpenCreateDB();
	 //单击事件
	 mListView.setOnItemClickListener(new OnItemClickListener(){
	
	 @Override
	 public void onItemClick(AdapterView<?> arg0, View arg1,
	 int arg2, long arg3) {
	
	 final Cursor c = db.rawQuery("SELECT * FROM HomeLibrary WHERE _id = ?", new String[]{""+(arg2+1)});
	 if(c.moveToFirst())
	 {
	 View view1=LayoutInflater.from(SplActivity.this).inflate(R.layout.dialog, null);
	 final TextView idd=(TextView) view1.findViewById(R.id.textView1);
	 final EditText command=(EditText) view1.findViewById(R.id.editText2);
	 final EditText result=(EditText) view1.findViewById(R.id.editText3);
	
	 idd.setText(c.getInt(0)+"");
	 command.setText(c.getString(1));
	 result.setText(c.getString(2));
	
	 new AlertDialog.Builder(SplActivity.this)
	 .setTitle("手动修改数据")
	 .setView(view1)
	 .setPositiveButton("确定修改", new AlertDialog.OnClickListener() {
	
	 @Override
	 public void onClick(DialogInterface dialog, int which) {
	 ContentValues cv = new ContentValues();
	 cv.put("command",command.getText().toString());
	 db.update("HomeLibrary", cv, "_id = ?", new String[]{idd.getText().toString()});
	 cv.put("result",result.getText().toString());
	 db.update("HomeLibrary", cv, "_id = ?", new String[]{idd.getText().toString()});
	 }
	 }).create().show();
	 }
	 }
	 });
	 }
	
	 public void BtnInit(){
	 insertBtn=(Button)findViewById(R.id.insert);
	 selectBtn=(Button)findViewById(R.id.select);
	 displayBtn=(Button)findViewById(R.id.display);
	 mListView=(ListView)findViewById(R.id.listview);
	 insertBtn.setOnClickListener(this);
	 selectBtn.setOnClickListener(this);
	 displayBtn.setOnClickListener(this);
	 }
	
	 public class DTData {
	 int _id;//与所建立的表对应
	 String command;
	 String result;
	 public DTData(String command,String result){
	 this.command=command;
	 this.result=result;
	 }
	 }
	
	 public void OpenCreateDB(){
	 db = openOrCreateDatabase("/sdcard/douting/HomeLibrary.db", Context.MODE_PRIVATE, null);
	 //db.execSQL("DROP TABLE IF EXISTS HomeLibrary"); //初始化数据库
	 //判断文件是否建立了表格，没有这生成表格
	 db.execSQL("CREATE TABLE IF NOT EXISTS HomeLibrary (_id INTEGER PRIMARY KEY AUTOINCREMENT, command VARCHAR, result VARCHAR)");
	 }
	
	 //加载数据到HomeLibrary表
	 public void InsertData(){
	 View view1=LayoutInflater.from(SplActivity.this).inflate(R.layout.dialog, null);
	 final TextView idd=(TextView) view1.findViewById(R.id.textView1);
	 final EditText command=(EditText) view1.findViewById(R.id.editText2);
	 final EditText result=(EditText) view1.findViewById(R.id.editText3);
	 idd.setText("序号自动生成");
	 new AlertDialog.Builder(SplActivity.this)
	 .setTitle("手动加载数据")
	 .setView(view1)
	 .setPositiveButton("确定加载", new AlertDialog.OnClickListener() {
	
	 @Override
	 public void onClick(DialogInterface dialog, int which) {
	 db.execSQL("INSERT INTO HomeLibrary VALUES (NULL,?,?)",
	 new Object[]{command.getText().toString(),result.getText().toString()});
	 Log.d("msg","加载成功");
	 }
	 }).create().show();
	 }
	
	 public void Find(String str1,int key)
	 {
	 List<String> list=new ArrayList<String>();
	 Cursor c = db.rawQuery("SELECT * FROM HomeLibrary", null);
	 int[] num = new int[c.getCount()]; //定义和数据库指令条数相等大小的数组
	 Log.d("msg","--------------全部数据----------------------------");
	 Log.d("msg",""+str1.length());//获得字符串中的对应字符
	 int k=0;
	 while (c.moveToNext()) {
	 if(c.getString(key).indexOf(str1.charAt(0))>=0)
	 {
	 num[k++] = c.getInt(0);
	 Log.d("msg",""+str1.charAt(0)+num[k-1]);
	 }
	 }
	 //循环匹配到最后一个字符
	 for (int i = 1; i < str1.length(); i++) {
	 int j=k=0;
	 while(num[j]!=0){
	 c.moveToFirst();
	 c.move(num[j]-1); //移动的时候要减1，否则会移动到下一个
	 if(c.getString(key).indexOf(str1.charAt(i))>=0)
	 {
	 num[j]=0;
	 num[k++] = c.getInt(0);
	 Log.d("msg",""+str1.charAt(i)+num[k-1]);
	 }
	 j++;
	 }
	 }
	 c.moveToFirst();
	 if(num[0]!=0)
	 c.move(num[0]-1); //移动的时候要减1，否则会移动到下一个
	 else
	 c.move(0); //防止都查不到出错
	 String string=""+c.getInt(0)+" "+c.getString(1)+" "+c.getString(2);
	 list.add(string);
	 c.close();
	 ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,list);
	 mListView.setAdapter(adapter);
	 }
	
	 //查找数据
	 public void Select(){
	 View view1=LayoutInflater.from(SplActivity.this).inflate(R.layout.dialog, null);
	 final TextView idd=(TextView) view1.findViewById(R.id.textView1);
	 final EditText command=(EditText) view1.findViewById(R.id.editText2);
	 final EditText result=(EditText) view1.findViewById(R.id.editText3);
	 idd.setText("选择其中一个查询");
	 new AlertDialog.Builder(SplActivity.this)
	 .setTitle("手动查询数据")
	 .setView(view1)
	 .setPositiveButton("确定查询", new AlertDialog.OnClickListener() {
	
	 @Override
	 public void onClick(DialogInterface dialog, int which) {
	 if(command.getText().toString().length()!=0)
	 Find(command.getText().toString(), 1);
	 else if(result.getText().toString().length()!=0)
	 Find(result.getText().toString(), 2);
	 Log.d("msg","查询成功");
	 }
	 }).create().show();
	
	
	 }
	
	 //显示数据
	 public void Display(){
	 List<String> list=new ArrayList<String>();
	 Cursor c = db.rawQuery("SELECT * FROM HomeLibrary", null);
	 while (c.moveToNext()) {
	 String string=""+c.getInt(0)+" "+c.getString(1)+" "+c.getString(2);
	 list.add(string);
	 Log.d("msg",string);
	 }
	 c.close();
	 ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,list);
	 mListView.setAdapter(adapter);
	 }
	
	 @Override
	 public void onClick(View v) {
	 switch(v.getId()){
	 case R.id.insert:
	 InsertData();
	 break;
	
	 case R.id.display:
	 Display();
	 break;
	
	 case R.id.select:
	 Select();
	 break;
	 }
	 }
	}
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