本文实例讲述了Android编程之数据库Sql编程实现方法。分享给大家供大家参考。具体分析如下：
Android中安装轻量级数据库Sqlite,现在测试数据库基本操作。
数据库基本操作：创建表，插入，删除可以用execSQL();读取可以用rawQuery();这两个函数都可以标准SQL语句进行操作。
源代码：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
package com.test.sql;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.util.Log;
public class test_sql extends Activity
{
DatabaseHelper mOpenHelper;
private static final String DATABASE_NAME = "test.db";
private static final int DATABASE_VERSION = 1;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
//新建一个用户表
//共有5项：Id Pwd Name OnLineTime Level
db.execSQL("CREATE TABLE User_Table ('Id' INT,'Pwd' VARCHAR,'Name' VARCHAR,'OnLineTime' INT,'Level' INT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mOpenHelper = new DatabaseHelper(this);
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
//清空数据
db.execSQL("DELETE FROM User_Table");
//插入数据10000 123456 "jdh" 0 0
//插入数据10001 123456 "jim" 0 0
db.execSQL("INSERT INTO User_Table VALUES (?,?,?,?,?)", new Object[]{10000,"123456","jdh",0,0});
db.execSQL("INSERT INTO User_Table VALUES (?,?,?,?,?)", new Object[]{10001,"123456","jim",0,0});
//读取数据
Cursor cursor = db.rawQuery("SELECT * FROM User_Table WHERE Name = ?",new String[]{"jdh"});
while (cursor.moveToNext())
{
String str = cursor.getInt(0) + cursor.getString(1) + cursor.getString(2) + cursor.getInt(3) + cursor.getInt(4);
Log.i("str:", str);
}
}
}
|
希望本文所述对大家的Android程序设计有所帮助。