本篇內(nèi)容介紹了“如何使用ContentValues對數(shù)據(jù)庫進(jìn)行相關(guān)操作”的有關(guān)知識，在實(shí)際案例的操作過程中，不少人都會(huì)遇到這樣的困境，接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧！希望大家仔細(xì)閱讀，能夠?qū)W有所成！
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在main.xml中：
android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:gravity="center_horizontal"> android:id="@+id/insertBut" android:layout_marginTop="8dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="增加數(shù)據(jù)" /> android:id="@+id/updateBut" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="修改數(shù)據(jù)" /> android:id="@+id/deleteBut" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="刪除數(shù)據(jù)" />
創(chuàng)建數(shù)據(jù)庫的建表操作類Mytab.java
package com.li.sqlite;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
public class Mytab {
private static final String TABLENAME = "mytab"; // 表示要操作的數(shù)據(jù)表名稱
private SQLiteDatabase db = null; // 數(shù)據(jù)庫操作
public Mytab(SQLiteDatabase db) {
this.db = db;
}
public void insert(String name,String birthday) { //向表中增加數(shù)據(jù)
ContentValues cv = new ContentValues();
cv.put("name",name);
cv.put("birthday",birthday);
this.db.insert(TABLENAME, null, cv);
this.db.close() ;
}
public void update(int id, String name, String birthday) { //修改表的數(shù)據(jù)
ContentValues cv = new ContentValues();
cv.put("name",name);
cv.put("birthday",birthday);
String whereCaluse = "id=?";
String whereArgs[] = new String[]{String.valueOf(id)};
this.db.update(TABLENAME, cv, whereCaluse, whereArgs);
this.db.close() ;
}
public void delete(int id) { //刪除表的數(shù)據(jù)
String whereCaluse = "id=?";
String whereArgs[] = new String[]{String.valueOf(id)};
this.db.delete(TABLENAME, whereCaluse, whereArgs);
this.db.close() ;
}
}
在MyDatabaseHelper.java類中：
package com.li.sqlite;
//數(shù)據(jù)庫的輔助操作類
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class MyDatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASENAME = "liyewen.db" ;
private static final int DATABASERVERSION = 1 ; // 設(shè)置數(shù)據(jù)庫的版本
private static final String TABLENAME = "mytab" ;
public MyDatabaseHelper(Context context) { // 用戶最關(guān)心的也肯定只是Context
super(context, DATABASENAME, null, DATABASERVERSION);
}
@Override
public void onCreate(SQLiteDatabase db) { // 創(chuàng)建數(shù)據(jù)表
String sql = "CREATE TABLE " + TABLENAME + "("
+ "id INTEGER PRIMARY KEY ," // 在SQLite中設(shè)置為Integer、PRIMARY KEY則ID自動(dòng)增長
+ "name VARCHAR(50) NOT NULL ,"
+ "birthday DATE NOT NULL" + ")";
db.execSQL(sql) ; // 執(zhí)行SQL
System.out.println("****************** 創(chuàng)建：onCreate()。");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sql = "DROP TABLE IF EXISTS " + TABLENAME ;
db.execSQL(sql) ;
System.out.println("****************** 更新：onUpgrade()。");
this.onCreate(db) ;
}
}
在MySQLiteDemo.java中：
package com.li.sqlite;
import android.app.Activity;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MySQLiteDemo extends Activity {
private Button inserBut = null;
private Button updateBut = null;
private Button deleteBut = null;
private SQLiteOpenHelper helper = null;
private Mytab mtab = null;
private static int count = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.inserBut = (Button)super.findViewById(R.id.insertBut);
this.updateBut = (Button)super.findViewById(R.id.updateBut);
this.deleteBut = (Button)super.findViewById(R.id.deleteBut);
this.helper = new MyDatabaseHelper(this);
this.inserBut.setOnClickListener(new InertOnClickListenerImpl());
this.updateBut.setOnClickListener(new UpdateOnClickListenerImpl());
this.deleteBut.setOnClickListener(new DeleteOnClickListenerImpl());
}
private class InertOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MySQLiteDemo.this.mtab = new Mytab(
MySQLiteDemo.this.helper.getWritableDatabase());
MySQLiteDemo.this.mtab.insert("liyewen" + count++, "1988-08-16");
}
}
private class UpdateOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MySQLiteDemo.this.mtab = new Mytab(
MySQLiteDemo.this.helper.getWritableDatabase());
MySQLiteDemo.this.mtab.update(72, "update", "1988/8/15");
}
}
private class DeleteOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MySQLiteDemo.this.mtab = new Mytab(
MySQLiteDemo.this.helper.getWritableDatabase());
MySQLiteDemo.this.mtab.delete(73);
}
}
}
“如何使用ContentValues對數(shù)據(jù)庫進(jìn)行相關(guān)操作”的內(nèi)容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識可以關(guān)注創(chuàng)新互聯(lián)網(wǎng)站，小編將為大家輸出更多高質(zhì)量的實(shí)用文章！
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