occi获取表，列，类型

create table temp_test(iid_number number, name_varchar2 varchar2(32), 
                        num_53 number(5,3), char_5 char(5), long_type long, raw_20 raw(20), 

blob_type blob, integer_type integer , stat_time_date date);
 

Environment *env; 

  Connection *conn; 
  Statement *stmt;

  ResultSet *rs;

env = Environment::createEnvironment();//创建环境变量
  conn = env->createConnection(username,password,connstring); //创建数据库连接对象
  stmt = conn->createStatement();//创Statement对象

string sql = "select * from temp_test";
stmt->setSQL(sql);//准备SQL语句

// 逐行获取表字段

try

{

                 rs =  stmt->executeQuery();//执行SQL语句，返回结果集
  while (rs->next()) //取数据
  {
  cout<<rs->getString(1)<<""<<rs->getString(2)<<" "<<rs->getInt(3)<<endl;
          }

}

catch(SQLException &ex) //异常处理
{
  cout << " Error Number "<< ex.getErrorCode() << endl;
  cout << ex.getMessage() << endl;
}

///获取表字段属性temp_test为表名

MetaData custtab_metaData = conn->getMetaData("temp_test", MetaData::PTYPE_TABLE);

vector <MetaData> listOfColumns = custtab_metaData.getVector(MetaData::ATTR_LIST_COLUMNS);

unsigned   int   uiColumnNum   =   listOfColumns.size(); 
printf( "字段数=%u\n ",   uiColumnNum); 

for   (int i=0;   i <uiColumnNum;   i++) 
{ 
  MetaData   columnObj   =   listOfColumns[i]; 
  //cout<<"columnObj.getType():"<<columnObj.getType()<<endl;
 
  printf( "%d   列名：%s\n ",   i+1,   columnObj.getString(MetaData::ATTR_NAME).c_str()); 
 
  printf( "%d   类型：%d,\n ",   i+1,   columnObj.getInt(MetaData::ATTR_DATA_TYPE)/*,   getTypeString(columnObj.getInt(MetaData::ATTR_DATA_TYPE)).c_str()*/); 
  printf( "%d   大小：%d\n ",   i+1,   columnObj.getInt(MetaData::ATTR_DATA_SIZE)); 
  printf( "%d   精度：%d\n ",   i+1,   columnObj.getInt(MetaData::ATTR_PRECISION)); 
  printf( "%d   数值范围：%d\n ",   i+1,   columnObj.getInt(MetaData::ATTR_SCALE)); 
  if(   columnObj.getBoolean(MetaData::ATTR_IS_NULL)   ) 
  printf( "%d   允许为空\n ",   i+1); 
  else 
  printf( "%d   不允许为空\n ",   i+1); 
  int nType = columnObj.getInt(MetaData::ATTR_DATA_TYPE);
  switch (nType)
  {
  case SQLT_DAT:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is date\n"; 
  break;
  case SQLT_NUM:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is number\n"; 
  break;
  case SQLT_CHR:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is varchar2\n";
  break;
  case SQLT_STR:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is SQLT_STR\n";
  break;
  case SQLT_LNG:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is SQLT_LNG\n";
  break;
  case SQLT_BLOB:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is SQLT_BLOB\n";
  break;
  case SQLT_INT:
  cout<<columnObj.getString(MetaData::ATTR_NAME).c_str()<<":is SQLT_INT\n";
  break;
 
  default:
  break;
  }
} 

//通过结果集获取字段属性

/* Create a statement and associate it with a select clause */
 string sqlStmt="temp_test";
 Statement *stmt=conn->createStatement(sqlStmt);
 /* Execute the statement to obtain a ResultSet */
 ResultSet *rset=stmt->executeQuery();
 /* Obtain the metadata about the select list */
 vector<MetaData>cmd=rset->getColumnListMetaData();
 /* The metadata is a column list and each element is a column metaData */
 int dataType=cmd[i].getInt(MetaData::ATTR_DATA_TYPE);

conn->terminateStatement(stmt);//终止Statement对象
  env->terminateConnection(conn);//断开数据库连接
  Environment::terminateEnvironment(env);// 终止环境变量