1.SQLiets
package com.example.laji;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Sql extends SQLiteOpenHelper{
public Sql(Context context) {
super(context, "user.db", null, 1);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("create table user(id integer primary key autoincrement," +
"name text)");
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
}
2.Dao_增查
package com.example.laji;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import java.util.ArrayList;
import java.util.List;
public class Dao {
Sql sql ;
SQLiteDatabase database;
public Dao(Context context) {
sql = new Sql(context);
database = sql.getReadableDatabase();
}
public void add(String name){
ContentValues values = new ContentValues();
values.put("name",name);
database.insert("user",null,values);
}
public List<UserBean> select(){
List<UserBean> list = new ArrayList<>();
UserBean userBean;
Cursor query = database.query("user", null, null, null, null, null, null);
while (query.moveToNext()){
String name = query.getString(query.getColumnIndex("name"));
userBean = new UserBean(name);
list.add(userBean);
}
return list;
}
}
3.UserBean
package com.example.laji;
public class UserBean {
private String name;
public UserBean(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}