SQLiteDatabase sqlitedb; //数据库对象
sqlitedb = this.openOrCreateDatabase(datebaseName, MODE_PRIVATE, null);
//执行代码：
SqlString = " create table " + tableName + " (_id integer primary key,num integer,data text) ";
sqlitedb.execSQL(SqlString);

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class DBHelper extends SQLiteOpenHelper {
  private static final int DB_VERSION = 1;
  public DBHelper(Context context, String name, CursorFactory factory, int version) {
    super(context, name, factory, version);
    // TODO Auto-generated constructor stub
  }
  public DBHelper(Context context, String dBName) {
    super(context, dBName, null, DB_VERSION);
  }
  @Override
  public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
  }
  public void onCreate(SQLiteDatabase db, String createDBSql) {
    // TODO Auto-generated method stub
    db.execSQL(createDBSql);
  }
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
  }
  @Override
  public void onOpen(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    super.onOpen(db);
  }
  public void InsertintoDB(SQLiteDatabase db,String sql)
  {
    db.execSQL(sql);
  }
  public Cursor opendb(SQLiteDatabase db,String sql) {
    return db.rawQuery(sql, null);
  }
}

//声明
SQLiteDatabase db = null;
DBHelper dbhelper = null;
//实例化
dbhelper = new DBHelper(this, "DBName");
//方法
void CreateTable() {
    String sql = "Create Table if not exists " + TABLE_NAME + " ( " + ID + " text not null , " + NAME + " text not null );";
    dbhelper.onCreate(db, sql);
  }
  void InsertDB(String id, String name) {
    db = dbhelper.getWritableDatabase();
    String sql = "insert into " + TABLE_NAME + " (" + ID + "," + NAME + ") values('" + id + "','" + name + "')";
    dbhelper.InsertintoDB(db, sql);
  }
  void getDB() {
    db = dbhelper.getReadableDatabase();
    String sql = "select * from " + TABLE_NAME;
    Cursor cursor = dbhelper.opendb(db, sql);
    String text = "";
    while (cursor.moveToNext()) {
      for (int i = 0; i < cursor.getColumnCount(); i++) {
        text += cursor.getString(i);
      }
      text += "\n";
    }
    Toast.makeText(this, cursor.getCount() + "\n" + text,Toast.LENGTH_LONG).show();
}