先进行简单的数据操作.然后在数据库上面做分页查询的操作,也就是listview分页.看代码
MySQLiteOpenHelper类,继承SQLiteOpenHelper类,是android中操作数据库的辅助类
package zuoyeSQLlite.hall;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class MySQLiteOpenHelper extends SQLiteOpenHelper {
private static final int dataversion=1;
private String TableName=””;
/**
* context当前的上下问,DataName数据库名称
*factory游标工厂,version数据库版本,TableName 要创建的表名
*/
public MySQLiteOpenHelper(Context context, String DataName,
CursorFactory factory, int version,String TableName)
{
super(context, DataName, factory, version);
this.TableName=TableName;
}
public MySQLiteOpenHelper(Context context,String DataName,int version,String TableName)
{
this(context, DataName, null, version,TableName);
// TODO Auto-generated constructor stub
}
public MySQLiteOpenHelper(Context context,String DataName,String TableName)
{
this(context, DataName, dataversion,TableName);
// TODO Auto-generated constructor stub
}
//onCreate方法只有在数据库被创建的时候触发
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String sql=”create table “+TableName+”(_id integer primary key,id text,name text,age text);”;
db.execSQL(sql);
System.out.println(“数据库被创建”);
}
//数据库被打开的时候触发
@Override
public void onOpen(SQLiteDatabase db) {
// TODO Auto-generated method stub
super.onOpen(db);
System.out.println(“数据库被打开”);
}
//数据库本版更新的时候触发
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
System.out.println(“数据库被更新”);
}
zuoyeSQLlite 类,是一个activity类
//注意.当助手类被new出来的时候,并不会触发其oncreat或者onopen方法,
//只有当取得数据库对象的时候才会触发oncreat或者onopen方法
//如mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
//如果数据库存在,则打开数据库触发onopen(),如果数据库不存在,则创建数据库,触发onCreate()
// 数据库操作中几个参数的意思:distinct=”如果多个相同值,只去一个”, table=”表命”, columns=”要查询的列名”,
selection=”查询 条件”,
// selectionArgs=”条件中用了占位符的参数”, groupBy=”数据分组”, having=”分组后的条件”,
orderBy=”排序方式”, limit=”分页查询”);
具体请看代码:
package zuoyeSQLlite.hall;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class zuoyeSQLlite extends Activity {
private TextView text_pageNo;//显示页码的textview
private Button button_next, button_last;
private ListView listview = null;
private ListAdapter adapter;
private MySQLiteOpenHelper mMySQLiteOpenHelper=null;//助手类
private SQLiteDatabase mSqLiteDatabase=null;//数据库对象
private EditText edit_id,edit_name,edit_age;
private Button button_add,button_update,button_delete,button_query;
private String text_id=””,text_name=””,text_age=””;
private int limit=5;//显示5行数据
private int pageNo=1;//页码
private int pageCount=0;//页面总数
private boolean isfirst=false;
public static final String TableName=”userinfo1″;
public static final String DataName=”myData”;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mMySQLiteOpenHelper =new MySQLiteOpenHelper(this, DataName, TableName);
findView();// 获得控件对象
isfirst=true;
}
//获取每个控件
private void findView(){
edit_id=(EditText)findViewById(R.id.edit_id);
edit_age=(EditText)findViewById(R.id.edit_age);
edit_name=(EditText)findViewById(R.id.edit_name);
button_add=(Button)findViewById(R.id.button_add);
button_add.setOnClickListener(new MyButtonListener());
button_delete=(Button)findViewById(R.id.button_delete);
button_delete.setOnClickListener(new MyButtonListener());
button_update=(Button)findViewById(R.id.button_update);
button_update.setOnClickListener(new MyButtonListener());
button_query=(Button)findViewById(R.id.button_query);
button_query.setOnClickListener(new MyButtonListener());
button_last = (Button) findViewById(R.id.button_last);
button_last.setOnClickListener(new MyButtonListener());
button_next = (Button) findViewById(R.id.button_next);
button_next.setOnClickListener(new MyButtonListener());
listview = (ListView) findViewById(android.R.id.list);
text_pageNo=(TextView)findViewById(R.id.text_page);
}
//button的监听类
class MyButtonListener implements android.view.View.OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.button_add:
insert();
break;
case R.id.button_delete:
delete();
break;
case R.id.button_update:
update();
break;
case R.id.button_query:
query(pageNo);
break;
case R.id.button_next:
pageNo++;
if(pageNo>pageCount){
pageNo=1;
}
query(pageNo);
break;
case R.id.button_last:
pageNo–;
if(pageNo<1){
pageNo=pageCount;
}
query(pageNo);
break;
}
}
}
//设置显示的页码
private void setpageNo(int pageNo){
String text=null;
text=pageNo+”/”+pageCount;
text_pageNo.setText(text);
}
//删除数据
private void delete(){
text_id=edit_id.getText().toString().trim();
String sql=”id=”+text_id;
try{
mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
mSqLiteDatabase.delete(TableName, sql, null);
}catch(Exception e){
e.getMessage();
System.out.println(“修改出错”);
}
}
//修改数据
private void update(){
text_id=edit_id.getText().toString().trim();
text_age=edit_age.getText().toString().trim();
text_name=edit_name.getText().toString().trim();
String where=”id=”+text_id;
ContentValues values=new ContentValues();
values.put(“id”, text_id);
values.put(“age”, text_age);
values.put(“name”, text_name);
try{
mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
mSqLiteDatabase.update(TableName, values, where, null);
}catch(Exception e){
e.getMessage();
System.out.println(“修改出错”);
}
}
//添加数据
private void insert(){
text_id=edit_id.getText().toString().trim();
text_age=edit_age.getText().toString().trim();
text_name=edit_name.getText().toString().trim();
mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(“id”, text_id);
values.put(“age”, text_age);
values.put(“name”, text_name);
try{
mSqLiteDatabase.insert(TableName, null, values);
}catch(Exception e){
e.getMessage();
System.out.println(“插入出错”);
}
}
private void setAdapter(Cursor cur){
/*Cursor cur=null;
cur=getDate();*/
if(cur!=null){
adapter=new SimpleCursorAdapter(zuoyeSQLlite.this, R.layout.user, cur,
new String[]{“_id”,”id”,”name”,”age”}, new int[]{R.id._id,R.id.userid,R.id.username,R.id.userage});
listview.setAdapter(adapter);
}
}
//查询数据
private void query(int pageNo){
mSqLiteDatabase=mMySQLiteOpenHelper.getReadableDatabase();
Cursor cursor=null;
if(isfirst){
cursor= mSqLiteDatabase.query(TableName, null, null,
null,null, null, null, null);
pageCount=cursor.getCount()/limit+1;
isfirst=false;
}
cursor= mSqLiteDatabase.query(TableName, null, null,
null,null, null, null, limit*(pageNo-1)+”,”+limit);//”5,9″,标志从第下标为5的行开始,返回9行数据
System.out.println(limit*(pageNo-1)+”–=–“+limit*pageNo);
s
setpageNo(pageNo);
setAdapter(cursor);
}
}