package com.example.utils; import java.util.ArrayList; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; public class DBManage extends SQLiteOpenHelper { static int init_version = 1; static String database_name = "android_sqlite_test.db"; static String tab_name = "uer_log"; static String tab_field01 = "_id"; static String tab_field02 = "log_name"; SQLiteDatabase mDatabase; public DBManage(Context context) { super(context, database_name, null, init_version); // TODO Auto-generated constructor stub mDatabase = getWritableDatabase(); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub String sql = "create table " + tab_name + " ( " + tab_field01 + " integer primary key , " + tab_field02 + " text not null) "; db.execSQL(sql); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub } /** * 插入记录 * * @param u * @return */ public boolean insertData(String... str) { int request_int = 0; for (int i = 0; i < str.length; i++) { // 实例化一个ContentValues 对象 ,作用，收集数据，方便于SQLite执行增，删，改，查 ContentValues contentValues = new ContentValues(); contentValues.put(tab_field02, str[i]); mDatabase.insert(tab_name, null, contentValues); request_int++; } return str.length == request_int; } public ArrayList<String> query(int top_int, String... str) { ArrayList<String> result_list = new ArrayList<String>(); mDatabase = getReadableDatabase(); //模糊查询的三种方式： /* * 全部查询 String current_sql_sel = "SELECT * FROM " + tab_name; Cursor c = mDatabase.rawQuery(current_sql_sel, null);*/ //1.使用这种query方法%号前不能加' ; Cursor c_test = mDatabase.query(tab_name, new String[]{tab_field02}, tab_field02+" LIKE ? ", new String[] { "%" + str[0] + "%" }, null, null, null); //2.使用这种query方法%号前必须加' ; // Cursor c_test=mDatabase.query(tab_name, new String[]{tab_field02},tab_field02+" like '%" + str[0] + "%'", null, null, null, null); //3.使用这种方式必须在%号前加' ; String current_sql_sel = "SELECT * FROM "+tab_name +" where "+tab_field02+" like '%"+str[0]+"%'"; //Cursor c_test = mDatabase.rawQuery(current_sql_sel, null); Log.e("tag", "查询完成..."); while (c_test.moveToNext()) { String name = c_test.getString(c_test.getColumnIndex(tab_field02)); //name.contains(str[0]); // 让集合中的数据不重复; if (!result_list.contains(name)) { result_list.add(name); Log.e("tag", name); } } c_test.close(); return result_list; } } |