【Android数据存储】SQLite使用实例(附源码)

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

01 package com.wirelessqa.sqlite;
02
03 import android.content.Context;
04 import android.database.sqlite.SQLiteDatabase;
05 import android.database.sqlite.SQLiteOpenHelper;
06 import android.util.Log;
07
08 /**
09  * DBHelper继承了SQLiteOpenHelper，作为维护和管理数据库的基类
10  * @author bixiaopeng 2013-2-16 下午3:05:52
11  */
12 public class DBHelper  extends SQLiteOpenHelper{
13
14     public static final String DB_NAME = "wirelessqa.db";
15     public static final String DB_TABLE_NAME = "info";
16     private static final int DB_VERSION=1;
17     public DBHelper(Context context) {
18         //Context context, String name, CursorFactory factory, int version
19         //factory输入null,使用默认值
20         super(context, DB_NAME, null, DB_VERSION);
21     }
22     //数据第一次创建的时候会调用onCreate
23     @Override
24     public void onCreate(SQLiteDatabase db) {
25         //创建表
26           db.execSQL("CREATE TABLE IF NOT EXISTS info" +
27                     "(_id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, age INTEGER, website STRING,weibo STRING)");
28           Log.i(WirelessQA.TAG, "create table");
29     }
30     //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
31     @Override
32     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
33         //在表info中增加一列other
34         //db.execSQL("ALTER TABLE info ADD COLUMN other STRING");
35         Log.i("WIRELESSQA", "update sqlite "+oldVersion+"---->"+newVersion);
36     }
37
38 }

数据库业务操作 – DBManager.java

001 package com.wirelessqa.sqlite;
002
003 import java.util.ArrayList;
004 import java.util.List;
005
006 import android.content.ContentValues;
007 import android.content.Context;
008 import android.database.Cursor;
009 import android.database.sqlite.SQLiteDatabase;
010 import android.util.Log;
011
012 /**
013  *DBManager是建立在DBHelper之上，封装了常用的业务方法
014  * @author bixiaopeng 2013-2-16 下午3:06:26
015  */
016 public class DBManager {
017
018     private DBHelper       helper;
019     private SQLiteDatabase db;
020
021     public DBManager(Context context){
022         helper = new DBHelper(context);
023         db = helper.getWritableDatabase();
024     }
025
026     /**
027      * 向表info中增加一个成员信息
028      *
029      * @param memberInfo
030      */
031     public void add(List<MemberInfo> memberInfo) {
032         db.beginTransaction();// 开始事务
033         try {
034             for (MemberInfo info : memberInfo) {
035                 Log.i(WirelessQA.TAG, "------add memberInfo----------");
036                 Log.i(WirelessQA.TAG, info.name + "/" + info.age + "/" + info.website + "/" + info.weibo);
037                 // 向表info中插入数据
038                 db.execSQL("INSERT INTO info VALUES(null,?,?,?,?)", new Object[] { info.name, info.age, info.website,
039                         info.weibo });
040             }
041             db.setTransactionSuccessful();// 事务成功
042         } finally {
043             db.endTransaction();// 结束事务
044         }
045     }
046
047     /**
048      * @param _id
049      * @param name
050      * @param age
051      * @param website
052      * @param weibo
053      */
054     public void add(int _id, String name, int age, String website, String weibo) {
055         Log.i(WirelessQA.TAG, "------add data----------");
056         ContentValues cv = new ContentValues();
057         // cv.put("_id", _id);
058         cv.put("name", name);
059         cv.put("age", age);
060         cv.put("website", website);
061         cv.put("weibo", weibo);
062         db.insert(DBHelper.DB_TABLE_NAME, null, cv);
063         Log.i(WirelessQA.TAG, name + "/" + age + "/" + website + "/" + weibo);
064     }
065
066     /**
067      * 通过name来删除数据
068      *
069      * @param name
070      */
071     public void delData(String name) {
072         // ExecSQL("DELETE FROM info WHERE name ="+"'"+name+"'");
073         String[] args = { name };
074         db.delete(DBHelper.DB_TABLE_NAME, "name=?", args);
075         Log.i(WirelessQA.TAG, "delete data by " + name);
076
077     }
078
079     /**
080      * 清空数据
081      */
082     public void clearData() {
083         ExecSQL("DELETE FROM info");
084         Log.i(WirelessQA.TAG, "clear data");
085     }
086
087     /**
088      * 通过名字查询信息,返回所有的数据
089      *
090      * @param name
091      */
092     public ArrayList<MemberInfo> searchData(final String name) {
093         String sql = "SELECT * FROM info WHERE name =" + "'" + name + "'";
094         return ExecSQLForMemberInfo(sql);
095     }
096
097     public ArrayList<MemberInfo> searchAllData() {
098         String sql = "SELECT * FROM info";
099         return ExecSQLForMemberInfo(sql);
100     }
101
102     /**
103      * 通过名字来修改值
104      *
105      * @param raw
106      * @param rawValue
107      * @param whereName
108      */
109     public void updateData(String raw, String rawValue, String whereName) {
110         String sql = "UPDATE info SET " + raw + " =" + " " + "'" + rawValue + "'" + " WHERE name =" + "'" + whereName
111                      + "'";
112         ExecSQL(sql);
113         Log.i(WirelessQA.TAG, sql);
114     }
115
116     /**
117      * 执行SQL命令返回list
118      *
119      * @param sql
120      * @return
121      */
122     private ArrayList<MemberInfo> ExecSQLForMemberInfo(String sql) {
123         ArrayList<MemberInfo> list = new ArrayList<MemberInfo>();
124         Cursor c = ExecSQLForCursor(sql);
125         while (c.moveToNext()) {
126             MemberInfo info = new MemberInfo();
127             info._id = c.getInt(c.getColumnIndex("_id"));
128             info.name = c.getString(c.getColumnIndex("name"));
129             info.age = c.getInt(c.getColumnIndex("age"));
130             info.website = c.getString(c.getColumnIndex("website"));
131             info.weibo = c.getString(c.getColumnIndex("weibo"));
132             list.add(info);
133         }
134         c.close();
135         return list;
136     }
137
138     /**
139      * 执行一个SQL语句
140      *
141      * @param sql
142      */
143     private void ExecSQL(String sql) {
144         try {
145             db.execSQL(sql);