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 = 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);  
           
 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[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;  
    }  
   
}

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