数据库SQLiteOpenHelper

增:insert into 表名 (字段名,字段名) values (?,?,?)
删:delete from 表名 where 字段=?
改:update 表名 set 字段=?,字段=? where 条件=?
查:select * form 表名 where 字段=?
(*可以更改为想要查找的内容)

创建数据库

package com.bawei.zsgcactivity;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class MySqlistHelper extends SQLiteOpenHelper{

public MySqlistHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("create table good (id integer primary key autoincrement,name char(50) not null, price char(50),producter char(50),color char(50) )");
db.execSQL("insert into good values(null,‘小米‘,‘1000‘,‘北京‘,‘黄色‘)");
db.execSQL("insert into good values(null,‘华为‘,‘1000‘,‘上海‘,‘红色‘)");
db.execSQL("insert into good values(null,‘苹果‘,‘1000‘,‘深圳‘,‘白色‘)");

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub

}

主方法调用

MySqlistHelper helper=new MySqlistHelper(this, "07a", null, 1);
SQLiteDatabase dp = helper.getReadableDatabase();

查询

Cursor c = dp.rawQuery("select * from good", null);

while (c.moveToNext()) {
int id = c.getInt(c.getColumnIndex("id"));
String name=c.getString(c.getColumnIndex("name"));
String price=c.getString(c.getColumnIndex("price"));
String producter=c.getString(c.getColumnIndex("producter"));
String color=c.getString(c.getColumnIndex("color"));
list.add(new Goods(id, name, price, producter, color));

}

修改

MySqlistHelper  helper=new MySqlistHelper(Xiougai.this, "07a", null, 1);
              dp = helper.getReadableDatabase();
             dp.execSQL("update good set name=?,price=?,producter=?,color=? where id=?", new Object[]{name1,price1,producter1,color1,id});

增加

dp.execSQL("insert into good values(null,?,?,?,?)", new Object[]{name,price,producter,color});

删除

dp.execSQL("delete from good where id=?", new Object[]{list.get(position).getId()});

时间： 2024-10-05 21:30:03

数据库SQLiteOpenHelper

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