Abrufen von Datentypinformationen für Spalten in einem Oracle OCCI ResultSet

Ich habe diesen alten Code herumliegen, ich denke, er macht genau das, was Sie wollen. Es verwendet OCI, nicht OCCI, aber vielleicht hilft es.

/* Get the number of columns in the query */
ub4 colCount = 0;
oraCheckErr( m_err, OCIAttrGet((dvoid *)_stmt, OCI_HTYPE_STMT, (dvoid *)&colCount,
                    0, OCI_ATTR_PARAM_COUNT, m_err));

ub2 oraType = 0;
OCIParam *col = 0;

ub4 nameLen, colWidth, charSemantics;
text *name;

for (ub4 i = 1; i <= colCount; i++)
{
    /* get parameter for column i */
    oraCheckErr( m_err, OCIParamGet((dvoid *)_stmt, OCI_HTYPE_STMT, m_err, (dvoid**)&col, i));

    /* get data-type of column i */
    oraType = 0;
    oraCheckErr( m_err, OCIAttrGet((dvoid *)col, OCI_DTYPE_PARAM,
            (dvoid *)&oraType, 0, OCI_ATTR_DATA_TYPE,  m_err));

    /* Retrieve the column name attribute */
    nameLen = 0;
    oraCheckErr( m_err, OCIAttrGet((dvoid*)col, OCI_DTYPE_PARAM,
            (dvoid**) &name, &nameLen, OCI_ATTR_NAME, m_err ));

    /* Retrieve the length semantics for the column */
    charSemantics = 0;
    oraCheckErr( m_err, OCIAttrGet((dvoid*)col, OCI_DTYPE_PARAM,
            (dvoid*) &charSemantics,0, OCI_ATTR_CHAR_USED, m_err ));

    colWidth = 0;
    if (charSemantics)
        /* Retrieve the column width in characters */
        oraCheckErr( m_err, OCIAttrGet((dvoid*)col, OCI_DTYPE_PARAM,
                (dvoid*) &colWidth, 0, OCI_ATTR_CHAR_SIZE, m_err ));
    else
        /* Retrieve the column width in bytes */
        oraCheckErr( m_err, OCIAttrGet((dvoid*)col, OCI_DTYPE_PARAM,
                (dvoid*) &colWidth,0, OCI_ATTR_DATA_SIZE, m_err ));

    _elements.output.push_back( SQLElement( String(reinterpret_cast<char*>(name), nameLen), getSQLTypes( oraType ), i, colWidth ));
}

OCIHandleFree ( (dvoid*) _stmt, OCI_HTYPE_STMT );

BEARBEITEN: Gemäß Ihrer Anfrage:

SQLTypes getSQLTypes(ub2 _oracleType)
{
switch( _oracleType )
{
    case SQLT_INT:
        return stInt;
    case SQLT_FLT:
    case SQLT_BDOUBLE:
        return stDouble;
    case SQLT_BFLOAT:
        return stFloat;
    case SQLT_ODT:
        return stDate;

    case SQLT_DATE:
    case SQLT_TIMESTAMP:
    case SQLT_TIMESTAMP_TZ:
    case SQLT_TIMESTAMP_LTZ:
        return stTimeStamp;

    case SQLT_CHR:
    case SQLT_NUM:
    case SQLT_STR:
    case SQLT_VCS:
    default:
        return stText;
}
}