ocos2d-x中使用sqlite数据库
分类: cocos2d-x
2012-12-07 16:09
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Cpp代码
- include "sqlite/sqlite3.h"
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- include "sqlite/sqlite3.h"
include "sqlite/sqlite3.h"
创建数据库的代码 返回sqlite3的一个指针,通过该指针可以添加、修改、删除数据
Cpp代码
- sqlite3 * DBUtils::creatTable()
- {
- sqlite3 *pDB = NULL;
- char * errMsg = NULL;
- std::string sqlstr;
- int result;
-
-
- result = sqlite3_open("save.db",&pDB);
- if( result != SQLITE_OK )
-
- cout<<errMsg<<endl;
-
- result=sqlite3_exec( pDB, "create table Info( id integer primary key autoincrement,name nvarchar(32),score nvarchar(50),award nvarchar(50)) ",NULL,&errMsg );
-
- return pDB;
-
-
- }
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- sqlite3 * DBUtils::creatTable()
- {
- sqlite3 *pDB = NULL;
- char * errMsg = NULL;
- std::string sqlstr;
- int result;
-
-
- result = sqlite3_open("save.db",&pDB);
- if( result != SQLITE_OK )
-
- cout<<errMsg<<endl;
-
- result=sqlite3_exec( pDB,"create table Info( id integer primary key autoincrement,award nvarchar(50)) ",&errMsg );
-
- return pDB;
-
-
- }
sqlite3 * DBUtils::creatTable()
{
sqlite3 *pDB = NULL;//数据库指针
char * errMsg = NULL;//错误信息
std::string sqlstr;//SQL指令
int result;//sqlite3_exec返回值
//打开一个数据库,如果该数据库不存在,则创建一个数据库文件
result = sqlite3_open("save.db",&pDB);
if( result != SQLITE_OK )
// CCLog( "打开数据库失败,错误码:%d ,错误原因:%sn",errMsg );
cout<<errMsg<<endl;
//创建表,设置ID为主键,且自动增加
result=sqlite3_exec( pDB,"create table Info( id integer primary key autoincrement,award nvarchar(50)) ",&errMsg );
return pDB;
// sqlite3_close(pDB);
}
通过创建数据库返回的指针,保存数据
Cpp代码
- int DBUtils::save(sqlite3 *pDB)
- {
- char * errMsg=NULL;
- std::string sqlstr=" insert into Info(name,score,award) values ( '1','1','1' ) ";
- int result = sqlite3_exec( pDB,sqlstr.c_str(),&errMsg );
- return result;
- }
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- int DBUtils::save(sqlite3 *pDB)
- {
- char * errMsg=NULL;
- std::string sqlstr=" insert into Info(name,'1' ) ";
- int result = sqlite3_exec( pDB,&errMsg );
- return result;
- }
int DBUtils::save(sqlite3 *pDB)
{
char * errMsg=NULL;
std::string sqlstr=" insert into Info(name,'1' ) ";
int result = sqlite3_exec( pDB,&errMsg );
return result;
}
查询数据
定义一个全局函数,也就是在类外定义
Cpp代码
- int loadRecord( void * para,int n_column, char ** column_value,char ** column_name )
- {
-
-
- InfoBean * info=new InfoBean(column_value[0],column_value[1],column_value[2],column_value[3]);
-
-
-
-
- DBUtils::list->addObject(info);
-
- info->autorelease();
- return 0;
- }
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- int loadRecord( void * para,int n_column,char ** column_value,char ** column_name )
- {
-
-
- InfoBean * info=new InfoBean(column_value[0],column_value[3]);
-
-
-
-
- DBUtils::list->addObject(info);
-
- info->autorelease();
- return 0;
- }
int loadRecord( void * para,int n_column,char ** column_value,char ** column_name )
{
InfoBean * info=new InfoBean(column_value[0],column_value[3]);
/*info->setId(column_value[0]);
info->setName(column_value[1]);
info->setScore(column_value[2]);
info->setAward(column_value[3]);*/
DBUtils::list->addObject(info);
info->autorelease();
return 0;
}
定义一个类的静态成员函数
Cpp代码
- void DBUtils::listAll(sqlite3 *pDB)
- {
- DBUtils::list=new CCSet();
- list->autorelease();
- char * errMsg=NULL;
- std::string sqlstr="select * from Info order by score desc limit 0,10";
- int result = sqlite3_exec( pDB,loadRecord,&errMsg );
-
-
- }
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- void DBUtils::listAll(sqlite3 *pDB)
- {
- DBUtils::list=new CCSet();
- list->autorelease();
- char * errMsg=NULL;
- std::string sqlstr="select * from Info order by score desc limit 0,10";
- int result = sqlite3_exec( pDB,&errMsg );
-
-
- }
void DBUtils::listAll(sqlite3 *pDB)
{
DBUtils::list=new CCSet();
list->autorelease();
char * errMsg=NULL;
std::string sqlstr="select * from Info order by score desc limit 0,10";
int result = sqlite3_exec( pDB,&errMsg );
}
当调用listAll的时候,执行到sqlite3_exec的时候,会回调loadRecord函数,一条数据调用一次
遍历CCSet
Cpp代码
- CCSetIterator it;
- InfoBean *bean;
- CCSet * list=listAllRecord();
- CCLOG("%s","hello");
- int position[]={300,606,300,530,454,378,302,760,302};
- int i=0;
- for(it=list->begin();it!=list->end();it++)
- {
- bean=(InfoBean *)(*it);
- if(!bean)
- break;
- CCLOG("%s",bean->getName());
- CCLabelTTF *m_pLabelName = CCLabelTTF::labelWithString(bean->getName(),"Arial",30);
- m_pLabelName->setColor(ccc3(255,0));
- int temp_one=2*i;
- int temp_two=(i+1)*2-1;
- m_pLabelName->setPosition(CCPointMake(position[temp_one],position[temp_two]));
- this->addChild(m_pLabelName);
- CCLabelTTF *m_pLabelScore = CCLabelTTF::labelWithString(bean->getScore(),30);
- m_pLabelScore->setColor(ccc3(255,0));
-
- m_pLabelScore->setPosition(CCPointMake(position[temp_one]+150,position[temp_two]));
- this->addChild(m_pLabelScore);
-
-
- i++;
- }
(编辑:李大同)
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