C说话SQLite3事宜和锁的操纵实例

本篇章节讲授C说话SQLite3事宜和锁的操纵。分享给各人供各人参考，详细如下：

#include <stdio.h>
#include <sqlite3.h>
static int lib_get_value_callback(void *buf,int argc,char *argv[],char *column_name[])
{
  printf("argc:%d,%s argv[0]:%s,%s argv[1]:%sn",argc,column_name[0],argv[0],column_name[1],argv[1]);
  return 0;
}
/*!
 * fn war_snprintf.
 * brief the functions snprintf produce output according to a format.
 * param str: the output buffer.
 * param size: size allow writting to buffer
 * param format: format string
 * param ap: variable list
 * return success: size written to buffer ; fail or output longer than size: -1
 */
int war_vsnprintf(char *str,size_t size,const char *format,va_list ap)
{
  int res;
  res = vsnprintf(str,size,format,ap);
  if (res >= size) {
  //tr_log(LOG_ERROR,"[v]snprintf failed or output longer than buffer!");
  printf("[v]snprintf failed or output longer than buffer!n");
    return -1;
  } else
    return res;
}
/*!
 * fn war_snprintf.
 * brief the functions snprintf produce output according to a format.
 * param str: the output buffer.
 * param size: size allow writting to buffer
 * param format: format string
 * return success: size written to buffer ; fail: -1
 */
int war_snprintf(char *str,...)
{
  int res;
  va_list ap;
  va_start(ap,format);
  res = war_vsnprintf(str,ap);
  va_end(ap);
  return res;
}
#define CHECK_RC(rc,szInfo,szErrMsg,db) if(rc!=SQLITE_OK)

      {printf("%s error!n",szInfo);

      printf("%sn",szErrMsg);

      sqlite3_free(szErrMsg);

      sqlite3_close(db);

      return 0;}
int main(int argc,char * argv[])
{
  sqlite3 *db;
  char *dbPath="tr.db";
  char *szErrMsg = 0;
  int rc = 0;
     rc= sqlite3_open(dbPath,&db);
   if(rc == SQLITE_OK){
    printf("open succeedn");
    }
   else{
    printf("open failn");
    }
  //char *szSql ="SELECT type,value FROM tr WHERE id=3";
  //char *szSql = "insert into tr values(null,-1,'','false',1,'node','')";
  char szSql[128];
  int i = 1;
  //char *Sql = "CREATE TABLE tr(id INTEGER PRIMARY KEY,pid INTEGER DEFAULT -1,name TEXT NOT NULL COLLATE NOCASE,rw varchar(5) DEFAULT 'true',getc varchar(5) DEFAULT 'false',noc INTEGER DEFAULT 0,nocc charchar(3) DEFAULT '',nin INTEGER DEFAULT 1,il INTEGER DEFAULT 0,acl varchar(255) DEFAULT '',type varchar(16) DEFAULT 'node',value TEXT DEFAULT NULL,UNIQUE(pid,name));";
  //rc=sqlite3_exec(db,Sql,&szErrMsg);
  //CHECK_RC(rc,"create table",db);
  for(i = 1;i <= 30;i++)
  {
  /*begin*/
   rc = sqlite3_exec(db,"BEGIN EXCLUSIVE",NULL,&szErrMsg);
   CHECK_RC(rc,"begin",db);
  war_snprintf(szSql,sizeof(szSql),"insert into tr values(null,%d,'jjhh','true','string','')",i);
  rc = sqlite3_exec(db,szSql,lib_get_value_callback,&szErrMsg);
  CHECK_RC(rc,"insert values",db);
  if((rc == SQLITE_OK)&&((i%2)==0))
    {
    rc=sqlite3_exec(db,"COMMIT",&szErrMsg);
    CHECK_RC(rc,db);
    war_snprintf(szSql,"SELECT id,value FROM tr WHERE pid=%d and name='%s'",i,"jjhh");
       rc = sqlite3_exec(db,&szErrMsg);
       CHECK_RC(rc,"query values",db);
    }
  else
    {
    rc=sqlite3_exec(db,"ROLLBACK",db);
    }
  sleep(5);
  }
  sqlite3_close(db);
  printf("happy everyday!");
  return 0;
}

但愿本文所述对各人C说话措施计划有所辅佐。

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