实例: 会员信息管理
功能：1.查看数据库 2.清空数据库 3.增加会员 4.删除会员 5.更新会员 6.查找会员
数据库基类 – DBHelper.java
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package com.wirelessqa.sqlite;
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import android.content.Context;
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android.database.sqlite.SQLiteDatabase;
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android.database.sqlite.SQLiteOpenHelper;
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android.util.Log;
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/**
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* DBHelper继承了SQLiteOpenHelper，作为维护和管理数据库的基类
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* @author bixiaopeng 2013-2-16 下午3:05:52
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public class DBHelper extends SQLiteOpenHelper{
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static final String DB_NAME = "wirelessqa.db";
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String DB_TABLE_NAME = "info";
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private final int DB_VERSION=117
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public DBHelper(Context context) {
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super(context,DB_NAME, null,DB_VERSION);
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void onCreate(SQLiteDatabase db) {
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db.execSQL("CREATE TABLE IF NOT EXISTS info" +
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"(_id INTEGER PRIMARY KEY AUTOINCREMENT,name VARCHAR,age INTEGER,website STRING,weibo STRING)");
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Log.i(WirelessQA.TAG, "create table");
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//数据库第一次创建时onCreate方法会被调用，我们可以执行创建表的语句，当系统发现版本变化之后，会调用onUpgrade方法，我们可以执行修改表结构等语句
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onUpgrade(SQLiteDatabase db,monospace!important; font-size:1em!important; border:0px!important; line-height:1.1em!important; margin:0px!important; outline:0px!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important">oldVersion,monospace!important; font-size:1em!important; border:0px!important; line-height:1.1em!important; margin:0px!important; outline:0px!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important">newVersion) {
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//db.execSQL("ALTER TABLE info ADD COLUMN other STRING");
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Log.i("WIRELESSQA""update sqlite "+oldVersion+"---->"+newVersion);
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}
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数据库业务操作 – DBManager.java
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java.util.ArrayList;
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java.util.List;
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android.content.ContentValues;
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android.database.Cursor;
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android.database.sqlite.SQLiteDatabase;
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*DBManager是建立在DBHelper之上，封装了常用的业务方法
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* @author bixiaopeng 2013-2-16 下午3:06:26
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private DBHelper helper;
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DBManager(Context context){
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helper = new DBHelper(context);
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db = helper.getWritableDatabase();
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* 向表info中增加一个成员信息
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*
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*/
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add(List<MemberInfo> memberInfo) {
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db.beginTransaction();
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for (MemberInfo info : memberInfo) {
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"------add memberInfo----------"036
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"/" + info.age + + info.website + + info.weibo);
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"INSERT INTO info VALUES(null,?,?)"Object[] { info.name,info.age,info.website,
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db.setTransactionSuccessful();
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} finally {
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/**
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* @param _id
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* @param age
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* @param weibo
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add(_id,monospace!important; font-size:1em!important; border:0px!important; line-height:1.1em!important; margin:0px!important; outline:0px!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important">age,String website,String weibo) {
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"------add data----------"056
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ContentValues cv = ContentValues();
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// cv.put("_id",_id);
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cv.put("name"
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"age"060
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"website"
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"weibo"062
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db.insert(DBHelper.DB_TABLE_NAME,cv);
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+ age + + website + + weibo);
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* 通过name来删除数据
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delData(String name) {
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// ExecSQL("DELETE FROM info WHERE name ="+"'"+name+"'");
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String[] args = { name };
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db.delete(DBHelper.DB_TABLE_NAME,monospace!important; font-size:1em!important; color:blue!important; border:0px!important; line-height:1.1em!important; margin:0px!important; outline:0px!important; float:none!important; vertical-align:baseline!important; position:static!important; left:auto!important; top:auto!important; right:auto!important; bottom:auto!important; height:auto!important; width:auto!important; min-height:auto!important">"name=?"
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"delete data by " + name);
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* 清空数据
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ExecSQL("DELETE FROM info"084
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"clear data"085
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* 通过名字查询信息,返回所有的数据
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* @param name
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ArrayList<MemberInfo> searchData(String name) {
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String sql = "SELECT * FROM info WHERE name =" + "'" + name + "'"094
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return ExecSQLForMemberInfo(sql);
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ArrayList<MemberInfo> searchAllData() {
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"SELECT * FROM info"099
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ExecSQLForMemberInfo(sql);
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* 通过名字来修改值
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* @param raw
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* @param rawValue
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updateData(String raw,String rawValue,String whereName) {
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"UPDATE info SET " + raw + " =" " " + rawValue + " WHERE name =" + whereName
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* 执行SQL命令返回list
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* @param sql
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* @return
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ArrayList<MemberInfo> ExecSQLForMemberInfo(String sql) {
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ArrayList<MemberInfo> list = ArrayList<MemberInfo>();
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Cursor c = ExecSQLForCursor(sql);
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while (c.moveToNext()) {
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MemberInfo info = MemberInfo();
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info._id = c.getInt(c.getColumnIndex("_id"));
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info.name = c.getString(c.getColumnIndex());
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info.age = c.getInt(c.getColumnIndex(130
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info.website = c.getString(c.getColumnIndex(131
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info.weibo = c.getString(c.getColumnIndex(132
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list.add(info);
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* 执行一个SQL语句
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ExecSQL(String sql) {
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db.execSQL(sql);
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"execSql: "
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catch (Exception e) {
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Log.e("ExecSQL Exception"
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* 执行SQL，返回一个游标
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