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();
}