SQLite 基本操作（增刪改查）

當你還不能寫出自己滿意的程序時，你就不要去睡覺。

public class DBOpenHelper extends SQLiteOpenHelper{

public DBOpenHelper(Context context, String name) {

super(context, name, null, 1);

// TODO Auto-generated constructor stub

}

public DBOpenHelper(Context context, String name, CursorFactory factory,

int version) {

super(context, name, factory, version);

// TODO Auto-generated constructor stub

}

@Override//首次創建數據庫的時候調用 一般可以把建庫 建表的操作

public void onCreate(SQLiteDatabase db) {

// TODO Auto-generated method stub

db.execSQL("create table if not exists stutb(_id integer primary key autoincrement,name text not null,sex text not null,age integer not null)");

db.execSQL("insert into stutb(name,sex,age)values('張三','女',18)");

}

@Override//當數據庫的版本發生變化的時候 會自動執行

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// TODO Auto-generated method stub

}

}

查找：

 private void queryall(SQLiteDatabase db) {
       Cursor  cusor = db.query("stutb", new String[]{"name", "sex", "age"}, null, null, null, null, "_id  desc");
        for (cusor.moveToFirst(); !cusor.isAfterLast(); cusor.moveToNext()) {
            String id, age,name, sex;
            id = cusor.getLong(cusor.getColumnIndex("id"))+"";
            age = cusor.getLong(cusor.getColumnIndex("age"))+"";
            name = cusor.getString(cusor.getColumnIndex("name"));
            sex = cusor.getString(cusor.getColumnIndex("sex"));
            Log.i("info", "id:  " + id + "name" + name + "sex" + sex + "age" + age);
        }
        cusor.close();


    }


    private void qureyByName(String mName, SQLiteDatabase db) {
        Cursor  cusor = db.query("stutb",null, "name=?", new String[]{mName}, null, null, null);
        String id, age,name, sex;
        if (cusor.moveToFirst()) {
            id = cusor.getLong(cusor.getColumnIndex("id"))+"";
            age = cusor.getLong(cusor.getColumnIndex("age"))+"";
            name = cusor.getString(cusor.getColumnIndex("name"));
            sex = cusor.getString(cusor.getColumnIndex("sex"));
            Toast.makeText(this, id + name + sex + age + "", Toast.LENGTH_LONG).show();
            Log.i("info", "id:  " + id + "name" + name + "sex" + sex + "age" + age);
        } else {
            Toast.makeText(this, "no query  result", Toast.LENGTH_LONG).show();
        }
    }


增加：SQLiteDatabase db = openOrCreateDatabase("stu.db", MODE_PRIVATE, null);
db.execSQL("create table if not exists stutb(_id integer primary key autoincrement,name text not null,sex text not null,age integer not null)");
ContentValues values = new ContentValues();
values.put("name", "張三");
values.put("sex", "男");
values.put("age", 19);
long rowId = db.insert("stutb", null, values);
values.clear();

刪除：

db.update("stutb", values, "_id>?", new String[]{"3"});//將全部id>3的人的性別改成女
db.delete("stutb", "name like ?", new String[]{"%豐%"});//刪除所有名字中帶有豐的人
Cursor c = db.query("stutb", null, "_id>?", new String[]{"0"}, null, null, "name");
if (c!=null) {
String [] columns= c.getColumnNames();
while (c.moveToNext()) {
for (String columnName : columns) {
   Log.i("info", c.getString(c.getColumnIndex(columnName)));
}
}
c.close();
}
db.close();
public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//每個程序都有自己的數據庫 默認情況下是各自互相不干擾
//創建一個數據庫 並且打開
SQLiteDatabase db =   openOrCreateDatabase("user.db", MODE_PRIVATE, null);
db.execSQL("create table if not exists usertb (_id integer primary key autoincrement, name text not null , age integer not null , sex text not null )");
db.execSQL("insert into usertb(name,sex,age) values('張三','女',18)");
db.execSQL("insert into usertb(name,sex,age) values('李四','女',19)");
db.execSQL("insert into usertb(name,sex,age) values('王五','男',20)");

Cursor c = db.rawQuery("select * from usertb", null);
if (c!=null) {
while (c.moveToNext()) {
Log.i("info", "_id:"+c.getInt(c.getColumnIndex("_id")));
Log.i("info", "name:"+c.getString(c.getColumnIndex("name")));
Log.i("info", "age:"+c.getInt(c.getColumnIndex("age")));
Log.i("info", "sex:"+c.getString(c.getColumnIndex("sex")));
Log.i("info", "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
c.close();
}
db.close();
}

public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//每個程序都有自己的數據庫 默認情況下是各自互相不干擾
//創建一個數據庫 並且打開
SQLiteDatabase db =   openOrCreateDatabase("user.db", MODE_PRIVATE, null);
db.execSQL("create table if not exists usertb (_id integer primary key autoincrement, name text not null , age integer not null , sex text not null )");
db.execSQL("insert into usertb(name,sex,age) values('張三','女',18)");
db.execSQL("insert into usertb(name,sex,age) values('李四','女',19)");
db.execSQL("insert into usertb(name,sex,age) values('王五','男',20)");

Cursor c = db.rawQuery("select * from usertb", null);
if (c!=null) {
while (c.moveToNext()) {
Log.i("info", "_id:"+c.getInt(c.getColumnIndex("_id")));
Log.i("info", "name:"+c.getString(c.getColumnIndex("name")));
Log.i("info", "age:"+c.getInt(c.getColumnIndex("age")));
Log.i("info", "sex:"+c.getString(c.getColumnIndex("sex")));
Log.i("info", "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
c.close();
}
db.close();
}

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SQLiteDatabase db = openOrCreateDatabase("stu.db", MODE_PRIVATE, null);
db.execSQL("create table if not exists stutb(_id integer primary key autoincrement,name text not null,sex text not null,age integer not null)");
ContentValues values = new ContentValues();
values.put("name", "張三");
values.put("sex", "男");
values.put("age", 19);
long rowId = db.insert("stutb", null, values);
values.clear();
values.put("name", "張三丰");
values.put("sex", "男");
values.put("age", 99);
db.insert("stutb", null, values);
values.clear();
values.put("name", "張三瘋");
values.put("sex", "男");
values.put("age", 59);
db.insert("stutb", null, values);
values.clear();
values.put("name", "張三峯");
values.put("sex", "男");
values.put("age", 39);
db.insert("stutb", null, values);
values.clear();
values.put("name", "張三封");
values.put("sex", "男");
values.put("age", 29);
db.insert("stutb", null, values);
values.clear();
values.put("sex", "女");
db.update("stutb", values, "_id>?", new String[]{"3"});//將全部id>3的人的性別改成女
db.delete("stutb", "name like ?", new String[]{"%豐%"});//刪除所有名字中帶有豐的人
Cursor c = db.query("stutb", null, "_id>?", new String[]{"0"}, null, null, "name");
if (c!=null) {
String [] columns= c.getColumnNames();
while (c.moveToNext()) {
for (String columnName : columns) {
Log.i("info", c.getString(c.getColumnIndex(columnName)));
}
}
c.close();
}
db.close();
}


}