android query 模糊查询

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 = ;
    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 = ;  

   for (int i = ; 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);  

 mDatabase.insert(tab_name, null, contentValues);  

 request_int++;
        }
        return str.length ==
request_int;
    }  

    // 根据条件模糊查询数据库数据
    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[] + "%" }, 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[] + "%'", 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;
    }  

}

Db.rawQuery(sql,selectionArgs);sql ="selcet * from where  字段 like '% "+datestr+" %' "; //sql语句