package com.test;
import java.util.ArrayList;
import java.util.List;
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.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
/**
* 本例实现SQLite数据库增加、删除、修改、模糊查询操作。这里不是最好的实现方法,
* 如想研究SQL如何封装,请详细查看SQLiteDatebase类.
* 查看SQL语句:String sql = SQLiteQueryBuilder.buildQueryString();
* 希望机友们多交流心得!
* @author ytm0220@163.com
*/
public class SQLDemo extends Activity {
private static String DB_NAME = "mycity.db";
private static int DB_VERSION = 1;
private static int POSTION;
private ListView listview;
private Cursor cursor;
private SQLiteDatabase db;
private SQLiteHelper dbHelper;
private ListAdapter listAdapter;
private EditText etCity;
private EditText etCode;
private Button bt_add;
private Button bt_modify;
private Button bt_query;
private List<CityBean> cityList = new ArrayList<CityBean>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
etCity = (EditText) findViewById(R.id.etCity);
etCode = (EditText) findViewById(R.id.etCode);
bt_add = (Button) findViewById(R.id.bt_add);
bt_modify = (Button) findViewById(R.id.bt_modify);
bt_query = (Button) findViewById(R.id.bt_query);
try{
/* 初始化并创建数据库 */
dbHelper = new SQLiteHelper(this, DB_NAME, null, DB_VERSION);
/* 创建表 */
db = dbHelper.getWritableDatabase(); //调用SQLiteHelper.OnCreate()
/* 查询表,得到cursor对象 */
cursor = db.query(SQLiteHelper.TB_NAME, null, null, null, null, null, CityBean.CODE + " DESC");
cursor.moveToFirst();
while(!cursor.isAfterLast() && (cursor.getString(1) != null)){
CityBean city = new CityBean();
city.setId(cursor.getString(0));
city.setCity(cursor.getString(1));
city.setCode(cursor.getString(2));
cityList.add(city);
cursor.moveToNext();
}
}catch(IllegalArgumentException e){
//当用SimpleCursorAdapter装载数据时,表ID列必须是_id,否则报错column '_id' does not exist
e.printStackTrace();
//当版本变更时会调用SQLiteHelper.onUpgrade()方法重建表 注:表以前数据将丢失
++ DB_VERSION;
dbHelper.onUpgrade(db, --DB_VERSION, DB_VERSION);
// dbHelper.updateColumn(db, SQLiteHelper.ID, "_"+SQLiteHelper.ID, "integer");
}
listview = (ListView)findViewById(R.id.listView);
listAdapter = new ListAdapter();
listview.setAdapter(listAdapter);
listview.setOnItemClickListener(new ListView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int postion,
long arg3) {
setSelectedValues(postion);
}
});
/* 插入表数据并ListView显示更新 */
bt_add.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
if(etCity.getText().length() > 1 && etCode.getText().length() >1){
ContentValues values = new ContentValues();
values.put(CityBean.CITY, etCity.getText().toString().trim());
values.put(CityBean.CODE, etCode.getText().toString().trim());
//插入数据 用ContentValues对象也即HashMap操作,并返回ID号
Long cityID = db.insert(SQLiteHelper.TB_NAME, CityBean.ID, values);
CityBean city = new CityBean();
city.setId(""+cityID);
city.setCity(etCity.getText().toString().trim());
city.setCode(etCode.getText().toString().trim());
cityList.add(city);
listview.setAdapter(new ListAdapter());
resetForm();
}
}
});
/* 查询表,模糊条件查询 */
bt_query.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View view) {
cityList.removeAll(cityList);
String sql = null;
String sqlCity = etCity.getText().length() > 0 ? CityBean.CITY + " like '%" + etCity.getText().toString().trim() + "%'" : "";
String sqlCode = etCode.getText().length() > 0 ? CityBean.CITY + " like '%" + etCity.getText().toString().trim() + "%'" : "";
if( (!"".equals(sqlCity)) && (!"".equals(sqlCode)) ){
sql = sqlCity + " and" + sqlCode;
}else if(!"".equals(sqlCity)){
sql = sqlCity;
}else if(!"".equals(sqlCode)){
sql = sqlCode;
}
cursor = db.query(true, SQLiteHelper.TB_NAME,
new String[]{CityBean.ID, CityBean.CITY, CityBean.CODE},
sql,
null, null, null, null, null);
cursor.moveToFirst();
while(!cursor.isAfterLast() && (cursor.getString(1) != null)){
CityBean city = new CityBean();
city.setId(cursor.getString(0));
city.setCity(cursor.getString(1));
city.setCode(cursor.getString(2));
cityList.add(city);
cursor.moveToNext();
}
listview.setAdapter(new ListAdapter());
resetForm();
}
});
/* 修改表数据 */
bt_modify.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
ContentValues values = new ContentValues();
values.put(CityBean.CITY, etCity.getText().toString().trim());
values.put(CityBean.CODE, etCode.getText().toString().trim());
db.update(SQLiteHelper.TB_NAME, values, CityBean.ID + "=" + cityList.get(POSTION).getId(), null);
cityList.get(POSTION).setCity(etCity.getText().toString().trim());
cityList.get(POSTION).setCode(etCode.getText().toString().trim());
listview.setAdapter(new ListAdapter());
resetForm();
}
});
}
/* 设置选中ListView的值 */
public void setSelectedValues(int postion){
POSTION = postion;
etCity.setText(cityList.get(postion).getCity());
etCode.setText(cityList.get(postion).getCode());
}
/* 重值form */
public void resetForm(){
etCity.setText("");
etCode.setText("");
}
@Override
protected void onDestroy() {
db.delete(SQLiteHelper.TB_NAME, null, null);
super.onDestroy();
}
private class ListAdapter extends BaseAdapter{
public ListAdapter(){
super();
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return cityList.size();
}
@Override
public Object getItem(int postion) {
// TODO Auto-generated method stub
return postion;
}
@Override
public long getItemId(int postion) {
// TODO Auto-generated method stub
return postion;
}
@Override
public View getView(final int postion, View view, ViewGroup parent) {
view = getLayoutInflater().inflate(R.layout.listview, null);
TextView tv = (TextView) view.findViewById(R.id.tvCity);
tv.setText("" + cityList.get(postion).getCity());
TextView bu = (TextView) view.findViewById(R.id.btRemove);
bu.setText(R.string.delete);
bu.setId(Integer.parseInt(cityList.get(postion).getId()));
/* 删除表数据 */
bu.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View view) {
try{
db.delete(SQLiteHelper.TB_NAME, CityBean.ID + "=" + view.getId(), null);
cityList.remove(postion);
listview.setAdapter(new ListAdapter());
}catch(Exception e){
e.printStackTrace();
}
}
});
return view;
}
}
}
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小程序源码 系统工具 SQLite 增、删、查、改操作源码.rar
共34个文件
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小程序源码 系统工具 SQLite 增、删、查、改操作源码.rar (34个子文件)
Android SQLite 增、删、查、改操作源码
.classpath 273B
assets
src
com
test
CityBean.java 593B
SQLDemo.java 8KB
SQLiteHelper.java 1KB
res
drawable-mdpi
icon.png 3KB
drawable-ldpi
icon.png 2KB
values
array.xml 210B
strings.xml 425B
layout
main.xml 2KB
listview.xml 813B
drawable-hdpi
icon.png 4KB
bin
resources.ap_ 12KB
SQLTest.apk 20KB
classes.dex 13KB
com
test
SQLDemo$3.class 3KB
SQLDemo.class 5KB
SQLDemo$2.class 2KB
SQLDemo$ListAdapter.class 2KB
R$string.class 569B
R$layout.class 396B
R$id.class 663B
R$array.class 362B
R$attr.class 310B
SQLDemo$4.class 2KB
SQLDemo$ListAdapter$1.class 2KB
SQLiteHelper.class 2KB
CityBean.class 973B
R$drawable.class 370B
SQLDemo$1.class 1KB
R.class 499B
default.properties 449B
.project 810B
AndroidManifest.xml 670B
gen
com
test
R.java 2KB
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