Sqlite3简单应用

sqlite3 *db;
	sqlite3_stmt *stat;
	char *zErrMsg = 0;
	char buffer2[1024]="0";

	
	int result = sqlite3_open16(_T("testh.db"),&db);;
	if(result == SQLITE_OK)
	{
		AfxMessageBox(_T("success1"));
	}
	else
	{
		AfxMessageBox(_T("fail1"));

	}

	sqlite3_exec(db,"CREATE TABLE list1 (fliename varchar(128) UNIQUE,fzip blob,ntest int,ntest1 int);",&zErrMsg);
	if (zErrMsg)
	{
		AfxMessageBox(_T("fail2"));
		sqlite3_free(zErrMsg);
	}
	//sqlite3_prepare 第一个参数是sqlite3 * 指针;
	//第二个参数是sql 字符串，可以包含多个sql语句;
	//第三个参数是sql 字符串长度，-1 sqlite 自己计算;
	//第四个参数是sqlite3_stmt ** 类型返回的是sql 解析的语句;
	//第个参数是const char *pzTail 用于指向zSql中下个sql语句开始的地址上,所以pzTail并没有重新开辟内存空间;
	const char *pzTail =NULL;
	const char *zSql = "insert into list1 values ('2.bmp',?,1); insert into list1 values ('2.bmp',1);";
	int nRet = sqlite3_prepare(db,zSql,-1,&stat,&pzTail);

	FILE *fp;
	long filesize = 0;
	char * ffile;
	fp = fopen("2.bmp","rb");
	if(fp != NULL)
	{
		fseek(fp,SEEK_END);
		filesize = ftell(fp);
		fseek(fp,SEEK_SET);
		ffile = new char[filesize+1];
		size_t sz = fread(ffile,sizeof(char),filesize+1,fp);

		fclose(fp);
	}


	//sqlite3_bind_xxx 函数第一个参数是sqlite3_prepare 后的sqlite3_stmt 指针变量;
	//第二个参数是列的索引（从索引0开始）;
	sqlite3_bind_blob(stat,1,ffile,filesize,NULL);
	delete(ffile);

	sqlite3_bind_int(stat,2,100);
	sqlite3_step(stat);

	//每次调用sqlite3_prepare 函数sqlite 会重新开辟sqlite3_stmt空间，;
	//所以在使用同一个sqlite3_stmt 指针再次调用sqlite3_prepare 前;
	//需要调用sqlite3_finalize先释放空间;
	sqlite3_finalize(stat);

	//--------------------------------------

	sqlite3_prepare(db,"select * from list1;",0);

	//在调用sqlite3_column_count获取查询结果列信息的时候不需要先执行sqlite3_step就可以获取;
	int nColNum = sqlite3_column_count(stat);

	int r = sqlite3_step(stat);

	//在调用sqlite3_column_type 和sqlite3_column_name获取列类型和列名称信息前需要先执行sqlite3_step;
	/*;
	#define SQLITE_INTEGER  1
	#define SQLITE_FLOAT    2
	#define SQLITE_TEXT     3
	#define SQLITE_BLOB     4
	#define SQLITE_NULL     5
	*/
	int colType = sqlite3_column_type(stat,0);
	const char *pchColName = sqlite3_column_name(stat,0);

	colType = sqlite3_column_type(stat,1);
	pchColName = sqlite3_column_name(stat,1);

	colType = sqlite3_column_type(stat,2);
	pchColName = sqlite3_column_name(stat,2);

	colType = sqlite3_column_type(stat,3);
	pchColName = sqlite3_column_name(stat,3);

	while(r == SQLITE_ROW)
	{
		const void * test = sqlite3_column_blob(stat,1);
		int size = sqlite3_column_bytes(stat,1);
		sprintf(buffer2,"%s",test);

		FILE *fp2;
		fp2 = fopen("outfile.bmp","wb");
		if(fp2 != NULL)
		{
			size_t ret = fwrite(test,size,fp2);
			fclose(fp2);
		}
		const unsigned char * ptest = sqlite3_column_text(stat,0);
		int ntest = sqlite3_column_int(stat,2);
		int ntest1 = sqlite3_column_int(stat,3);
		r = sqlite3_step(stat);
	}
	sqlite3_finalize(stat);
	sqlite3_close(db);

（编辑：李大同）

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