//創建表
create table person(_id integer primary key autoincrement,name varchar(32),age integer)
//插入數據
insert into person values(1,"bojie",18)
insert into person values(2,"pange",18)
//刪除數據
delete from person where name="pange"
//查詢數據
select name from person where _id=2
//修改數據
update person set name="pange+tanji" where name="pange"
sqlite
public class MySqliteHelper extends SQLiteOpenHelper {
/**
* version 1
* factory 數據查找的遊標 默認null>>> cursor
* name 數據庫名
* @param context
*/
public MySqliteHelper(Context context) {
super(context, "my.db", null, 1);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table person (id integer primary key autoincrement,name varchar(32),sex varchar(30),age varchar(30),phone varchar(30), qq varchar(30))");
}
Dao層
public class PersonService {
private MySqliteHelper helper;
public PersonService(Context context) {
helper = new MySqliteHelper(context);
}
/**
* 插入數據
* @param p
*/
public void insert(Persons p) {
SQLiteDatabase db = helper.getWritableDatabase();
if (db.isOpen()) {
db.execSQL(
"insert into person values (null,?,?,?,?,?)",
new Object[] { p.getName(), p.getSex(), p.getAge(),
p.getQq(), p.getPhone() });
}
db.close();
}
/**
* 刪除數據
* @param name
*/
public void del(int id) {
SQLiteDatabase db = helper.getWritableDatabase();
if (db.isOpen()) {
db.execSQL("delete from person where id=?", new Object[] { id });
}
db.close();
}
/**
* 修改數據
* @param oldName
* @param newName
*/
public void update(String oldName, String newName) {
SQLiteDatabase db = helper.getWritableDatabase();
if (db.isOpen()) {
db.execSQL("update person set name=? where name=?", new String[] {
newName, oldName });
}
db.close();
}
/**
* 查詢所有數據
* @return
*/
public List<Persons> getAll() {
List<Persons> lists = new ArrayList<Persons>();
SQLiteDatabase db = helper.getReadableDatabase();
if (db.isOpen()) {
Cursor cursor = db.rawQuery(
"select * from person", null);
if (cursor != null && cursor.getCount() > 0) {
while (cursor.moveToNext()) {
Persons person = new Persons();
person.setId(cursor.getInt(0));
person.setName(cursor.getString(1));
person.setSex(cursor.getString(2));
person.setAge(cursor.getString(3));
person.setQq(cursor.getString(4));
person.setPhone(cursor.getString(5));
lists.add(person);
}
}
cursor.close();
return lists;
}
db.close();
return null;
}
/**
* 查詢對應的數據
* @param id
* @return
*/
public Persons getPersonById(int id) {
SQLiteDatabase db = helper.getReadableDatabase();
Persons person = new Persons();
if (db.isOpen()) {
Cursor cursor = db.rawQuery(
"select name,sex,age,phone,qq from person where id=? ",
new String[] { String.valueOf(id) });
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToLast()) {
String name = cursor.getString(0);
person.setName(name);
String sex = cursor.getString(1);
person.setSex(sex);
String age = cursor.getString(2);
person.setAge(age);
String phone = cursor.getString(3);
person.setPhone(phone);
String qq = cursor.getString(4);
person.setQq(qq);
}
}
cursor.close();
return person;
}
db.close();
return null;
}
//此處爲Persons類：
public class Persons {
private int id;
private String name;
private String sex;
private String age;
private String qq;
private String phone;
public Persons(){
super();
}
public Persons(String name, String sex, String age, String qq,String phone) {
this.name=name;
this.sex=sex;
this.age=age;
this.qq=qq;
this.phone=phone;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getQq() {
return qq;
}
public void setQq(String qq) {
this.qq = qq;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "Persons [name=" + name + ", sex=" + sex + ", age=" + age
+ ", qq=" + qq + ", phone=" + phone + "]";
}
}