android sqlite使用之模糊查询数据库数据的三种方式

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;

}

// 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;

}

}