parent
d0b75280dd
commit
cf41a715d9
@ -0,0 +1,47 @@
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package com.example.Cat.activity.activity;
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public class UserInfo {
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int id;
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String username;
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String paswd, sex;
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String city;
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public UserInfo(int id,String username, String paswd, String sex, String city){
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this.id=id;
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this.username = username;
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this.paswd = paswd;
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this.sex = sex;
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this.city = city;
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}
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public void setId(int id) {
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this.id = id;
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}
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public void setUsername(String username) {
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this.username = username;
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}
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public void setPaswd(String paswd) {
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this.paswd = paswd;
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}
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public void setSex(String sex) {
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this.sex = sex;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public int getId() {
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return id;
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}
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public String getUsername() {
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return username;
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}
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public String getPaswd() {
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return paswd;
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}
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public String getSex() {
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return sex;
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}
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public String getCity() {
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return city;
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}
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}
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@ -0,0 +1,114 @@
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package com.example.Cat.activity.activity;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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import java.util.ArrayList;
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import java.util.List;
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public class User_Database extends SQLiteOpenHelper {
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Context context;
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public User_Database(Context context) {
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super(context, "user_db", null, 1);
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this.context=context;
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System.out.println("in User_Database ,context="+ context);
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}
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@Override
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public void onCreate(SQLiteDatabase sqLiteDatabase) {
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System.out.println("onCreate");
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String sql = "create table user(" +
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"id integer primary key autoincrement," +
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"username varchar(20),paswd varchar(20)," +
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"sex varchar(20)," +
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"city longtext)";
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sqLiteDatabase.execSQL(sql);
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Log.i("SQLite","execSQL(sql)");
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}
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//数据库版本号更新时调用
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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}
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//添加数据
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public void adddata(SQLiteDatabase sqLiteDatabase, String username, String paswd, String sex, String city) {
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ContentValues values = new ContentValues();
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values.put("username", username);
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values.put("paswd", paswd);
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values.put("sex", sex);
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values.put("city", city);
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sqLiteDatabase.insert("user", null, values);
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//sqLiteDatabase.close();
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}
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//删除数据
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public void delete(SQLiteDatabase sqLiteDatabase, int id) {
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/*第一个参数：表名；第二个参数：需要删除的属性名，？代表占位符；第三个参数：属性名的属性值*/
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sqLiteDatabase.delete("user", "id=?", new String[]{id + ""});
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sqLiteDatabase.close();
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}
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//更新数据
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public void update(SQLiteDatabase sqLiteDatabase, int id, String username,
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String paswd, String sex, String city) {
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//创建一个ContentValues对象
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ContentValues values = new ContentValues();
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//以键值对的形式插入
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values.put("username", username);
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values.put("paswd", paswd);
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values.put("sex", sex);
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values.put("city", city);
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//执行修改的方法
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sqLiteDatabase.update("user", values, "id=?", new String[]{id + ""});
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sqLiteDatabase.close();
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}
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//查询全部数据
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public List<UserInfo> querydata(SQLiteDatabase sqLiteDatabase) {
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Cursor cursor = sqLiteDatabase.query("user", null, null, null, null, null, "id ASC");
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List<UserInfo> list = new ArrayList<UserInfo>();
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while (cursor.moveToNext()) {
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int id = cursor.getInt(cursor.getColumnIndex("id"));
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Log.i("SQLite","id="+id);
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String username = cursor.getString(1);
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Log.i("SQLite","username="+username);
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String paswd = cursor.getString(2);
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Log.i("SQLite","paswd="+paswd);
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String sex = cursor.getString(3);
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Log.i("SQLite","sex="+sex);
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String city = cursor.getString(4);
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Log.i("SQLite","city="+city);
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list.add(new UserInfo(id, username, paswd, sex, city));
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}
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cursor.close();
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sqLiteDatabase.close();
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return list;
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}
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public List<UserInfo> queryByname(SQLiteDatabase sqLiteDatabase,String name) {
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Cursor cursor = sqLiteDatabase.query("user", null, "name=?", new String[]{name}, null, null, "id ASC");
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List<UserInfo> list = new ArrayList<UserInfo>();
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while (cursor.moveToNext()) {
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int id = cursor.getInt(cursor.getColumnIndex("id"));
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Log.i("SQLite","id="+id);
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String username = cursor.getString(1);
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Log.i("SQLite","username="+username);
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String paswd = cursor.getString(2);
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Log.i("SQLite","paswd="+paswd);
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String sex = cursor.getString(3);
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Log.i("SQLite","sex="+sex);
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String city = cursor.getString(4);
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list.add(new UserInfo(id, username, paswd, sex, city));
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}
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cursor.close();
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sqLiteDatabase.close();
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return list;
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}
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}
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Loading…
Reference in new issue