QueryResult.cpp

Go to the documentation of this file.

/*
* This file is part of Project SkyFire https://www.projectskyfire.org.
* See LICENSE.md file for Copyright information
*/
 
#include "DatabaseEnv.h"
#include "Log.h"
 
ResultSet::ResultSet(MYSQL_RES* result, MYSQL_FIELD* fields, uint64 rowCount, uint32 fieldCount) :
    _rowCount(rowCount),
    _fieldCount(fieldCount),
    _result(result),
    _fields(fields)
{
    _currentRow = new Field[_fieldCount];
    ASSERT(_currentRow);
}
 
PreparedResultSet::PreparedResultSet(MYSQL_STMT* stmt, MYSQL_RES* result, uint64 rowCount, uint32 fieldCount) :
    m_rowCount(rowCount),
    m_rowPosition(0),
    m_fieldCount(fieldCount),
    m_rBind(NULL),
    m_stmt(stmt),
    m_res(result),
    m_isNull(NULL),
    m_length(NULL)
{
    if (!m_res)
        return;
 
    if (m_stmt->bind_result_done)
    {
        delete[] m_stmt->bind->length;
        delete[] m_stmt->bind->is_null;
    }
 
    m_rBind = new MYSQL_BIND[m_fieldCount];
    m_isNull = new bool[m_fieldCount];
    m_length = new unsigned long[m_fieldCount];
 
    memset(m_isNull, 0, sizeof(bool) * m_fieldCount);
    memset(m_rBind, 0, sizeof(MYSQL_BIND) * m_fieldCount);
    memset(m_length, 0, sizeof(unsigned long) * m_fieldCount);
 
    //- This is where we store the (entire) resultset
    if (mysql_stmt_store_result(m_stmt))
    {
        SF_LOG_WARN("sql.sql", "%s:mysql_stmt_store_result, cannot bind result from MySQL server. Error: %s", __FUNCTION__, mysql_stmt_error(m_stmt));
        delete[] m_rBind;
        delete[] m_isNull;
        delete[] m_length;
        return;
    }
 
    //- This is where we prepare the buffer based on metadata
    uint32 i = 0;
    MYSQL_FIELD* field = mysql_fetch_field(m_res);
    while (field)
    {
        size_t size = Field::SizeForType(field);
 
        m_rBind[i].buffer_type = field->type;
        m_rBind[i].buffer = malloc(size);
        memset(m_rBind[i].buffer, 0, size);
        m_rBind[i].buffer_length = size;
        m_rBind[i].length = &m_length[i];
        m_rBind[i].is_null = &m_isNull[i];
        m_rBind[i].error = NULL;
        m_rBind[i].is_unsigned = field->flags & UNSIGNED_FLAG;
 
        ++i;
        field = mysql_fetch_field(m_res);
    }
 
    //- This is where we bind the bind the buffer to the statement
    if (mysql_stmt_bind_result(m_stmt, m_rBind))
    {
        SF_LOG_WARN("sql.sql", "%s:mysql_stmt_bind_result, cannot bind result from MySQL server. Error: %s", __FUNCTION__, mysql_stmt_error(m_stmt));
        delete[] m_rBind;
        delete[] m_isNull;
        delete[] m_length;
        return;
    }
 
    m_rowCount = mysql_stmt_num_rows(m_stmt);
 
    m_rows.resize(uint32(m_rowCount));
    while (_NextRow())
    {
        m_rows[uint32(m_rowPosition)] = new Field[m_fieldCount];
        for (uint64 fIndex = 0; fIndex < m_fieldCount; ++fIndex)
        {
            if (!*m_rBind[fIndex].is_null)
                m_rows[uint32(m_rowPosition)][fIndex].SetByteValue(m_rBind[fIndex].buffer,
                    m_rBind[fIndex].buffer_length,
                    m_rBind[fIndex].buffer_type,
                    *m_rBind[fIndex].length);
            else
                switch (m_rBind[fIndex].buffer_type)
                {
                    case MYSQL_TYPE_TINY_BLOB:
                    case MYSQL_TYPE_MEDIUM_BLOB:
                    case MYSQL_TYPE_LONG_BLOB:
                    case MYSQL_TYPE_BLOB:
                    case MYSQL_TYPE_STRING:
                    case MYSQL_TYPE_VAR_STRING:
                        m_rows[uint32(m_rowPosition)][fIndex].SetByteValue("",
                            m_rBind[fIndex].buffer_length,
                            m_rBind[fIndex].buffer_type,
                            *m_rBind[fIndex].length);
                        break;
                    default:
                        m_rows[uint32(m_rowPosition)][fIndex].SetByteValue(0,
                            m_rBind[fIndex].buffer_length,
                            m_rBind[fIndex].buffer_type,
                            *m_rBind[fIndex].length);
                }
        }
        m_rowPosition++;
    }
    m_rowPosition = 0;

    CleanUp();
}
 
ResultSet::~ResultSet()
{
    CleanUp();
}
 
PreparedResultSet::~PreparedResultSet()
{
    for (uint32 i = 0; i < uint32(m_rowCount); ++i)
        delete[] m_rows[i];
}
 
bool ResultSet::NextRow()
{
    MYSQL_ROW row;
 
    if (!_result)
        return false;
 
    row = mysql_fetch_row(_result);
    if (!row)
    {
        CleanUp();
        return false;
    }
 
    unsigned long* lengths = mysql_fetch_lengths(_result);
    if (!lengths)
    {
        CleanUp();
        return false;
    }
 
    for (uint32 i = 0; i < _fieldCount; i++)
        _currentRow[i].SetStructuredValue(row[i], _fields[i].type, lengths[i]);
 
    return true;
}
 
bool PreparedResultSet::NextRow()
{
    if (++m_rowPosition >= m_rowCount)
        return false;
 
    return true;
}
 
bool PreparedResultSet::_NextRow()
{
    if (m_rowPosition >= m_rowCount)
        return false;
 
    int retval = mysql_stmt_fetch(m_stmt);
 
    if (!retval || retval == MYSQL_DATA_TRUNCATED)
        retval = true;
 
    if (retval == MYSQL_NO_DATA)
        retval = false;
 
    return retval;
}
 
void ResultSet::CleanUp()
{
    if (_currentRow)
    {
        delete[] _currentRow;
        _currentRow = NULL;
    }
 
    if (_result)
    {
        mysql_free_result(_result);
        _result = NULL;
    }
}
 
void PreparedResultSet::CleanUp()
{
    if (m_res)
        mysql_free_result(m_res);
 
    FreeBindBuffer();
    mysql_stmt_free_result(m_stmt);
 
    delete[] m_rBind;
}
 
void PreparedResultSet::FreeBindBuffer()
{
    for (uint32 i = 0; i < m_fieldCount; ++i)
        free(m_rBind[i].buffer);
}