先贴上SQLiteOpenHelper的代码,我们创建测试的表是user,它有四个字段id,name,age,height,remark,测试用的小米2,默认条数为100行。
//MySQliteOpenHelper作为一个访问SQLite的帮助类,提供两方面的功能
//1.getReadableDatabase(),getWritableDatabase()可以获得SQLiteDatatbase对象,
//对这个对象进行相关操作
//2.提供了onCreate()和onUpgrade()两个回调函数,允许我们在创建和升级数据库时进行操作
public class MySQLiteOpenHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "test.db";
public static final String TAG = "MySQLiteOpenHelper";
public MySQLiteOpenHelper(Context context) {
this(context, DATABASE_NAME, null, 1);
}
public MySQLiteOpenHelper(Context context, int version) {
this(context, DATABASE_NAME, null, version);
}
// 必须要有这一个构造方法
public MySQLiteOpenHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}
// 当数据库第一次创建的时候被调用,
// 当调用getReadableDatabase ()或getWritableDatabase 的时候
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
Log.d(TAG, "onCreate");
String sql = "create table user(id integer primary key autoincrement,"
+ "name varchar(20)," + "age integer," + "height long,"
+ "remark varchar(12))";
db.execSQL(sql);
}
public void close() {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("drop table user");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
Log.d(TAG, "onUpgrade");
}
}
1。使用ContentValues插入。完成时间:4805493666(纳秒)
/**
* ContentValues方式
*
* @param sum
* @return
*/
public long insert1(int sum) {
long before = System.nanoTime();
MySQLiteOpenHelper dbHelper = new MySQLiteOpenHelper(MainActivity.this);
// 得到数据库对象
SQLiteDatabase db = dbHelper.getWritableDatabase();
for (int i = 0; i < sum; i++) {
ContentValues cv = new ContentValues();
cv.put("name", "zhangsan");
cv.put("age", "23");
cv.put("height", 1.78);
cv.put("remark", "无");
db.insert("user", null, cv);
}
db.close();
long after = System.nanoTime();
return after - before;
}
public long insert2(int sum) {
long before = System.nanoTime();
MySQLiteOpenHelper dbHelper = new MySQLiteOpenHelper(MainActivity.this);
// 得到数据库对象
SQLiteDatabase db = dbHelper.getWritableDatabase();
for (int i = 0; i < sum; i++) {
String sql = "insert into user(name,age,height,remark) values('zhangsan',23,1.78,'无')";
db.execSQL(sql);
}
db.close();
long after = System.nanoTime();
return after - before;
}
public long insert3(int sum) {
long before = System.nanoTime();
MySQLiteOpenHelper dbHelper = new MySQLiteOpenHelper(MainActivity.this);
// 得到数据库对象
SQLiteDatabase db = dbHelper.getWritableDatabase();
String sql = "insert into user(name,age,height,remark) values(?,?,?,?)";
SQLiteStatement stmt = db.compileStatement(sql);
for (int i = 0; i < sum; i++) {
stmt.clearBindings();
stmt.bindString(1, "zhangsan");
stmt.bindLong(2, 23);
stmt.bindLong(3, 178);
stmt.bindString(4, "无");
stmt.execute();
}
db.close();
long after = System.nanoTime();
return after - before;
}
public long insert4(int sum) {
long before = System.nanoTime();
MySQLiteOpenHelper dbHelper = new MySQLiteOpenHelper(MainActivity.this);
// 得到数据库对象
SQLiteDatabase db = dbHelper.getWritableDatabase();
for (int i = 0; i < sum / 10; i++) {
String sql = "insert into user(name,age,height,remark) values('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无'),"
+ "('zhangsan',23,1.78,'无')";
db.execSQL(sql);
}
db.close();
long after = System.nanoTime();
return after - before;
}
5.使用事务处理插入方式。完成时间:229787881(纳秒)