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150 lines (126 loc) · 4.45 KB
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#include "Query.h"
#include <algorithm>
namespace sqlb
{
void Query::clear()
{
m_table.clear();
m_rowid_columns = {"_rowid_"};
m_selected_columns.clear();
m_where.clear();
m_sort.clear();
}
std::string Query::buildWherePart() const
{
if(m_where.empty() && m_global_where.empty())
return std::string();
std::string where = "WHERE ";
if(m_where.size())
{
for(auto i=m_where.cbegin();i!=m_where.cend();++i)
{
const auto it = findSelectedColumnByName(i->first);
std::string column = sqlb::escapeIdentifier(i->first);
if(it != m_selected_columns.cend() && it->selector != i->first)
column = it->selector;
where += column + " " + i->second + " AND ";
}
// Remove last ' AND '
where.erase(where.size() - 5);
}
if(m_global_where.size())
{
// Connect to previous conditions if there are any
if(m_where.size())
where += " AND ";
// For each condition
for(const auto& w : m_global_where)
{
where += "(";
// For each selected column
for(const auto& c : m_column_names)
{
const auto it = findSelectedColumnByName(c);
std::string column = sqlb::escapeIdentifier(c);
if(it != m_selected_columns.cend() && it->selector != column)
column = it->selector;
where += column + " " + w + " OR ";
}
// Remove last ' OR '
where.erase(where.size() - 4);
where += ") AND ";
}
// Remove last ' AND '
where.erase(where.size() - 5);
}
return where;
}
std::string Query::buildQuery(bool withRowid) const
{
// Selector and display formats
std::string selector;
if (withRowid)
{
// We select the rowid data into a JSON array in case there are multiple rowid columns in order to have all values at hand.
// If there is only one rowid column, we leave it as is.
if(m_rowid_columns.size() == 1)
{
// As of SQLite 3.36 when selecting rowid from a view SQLite does not return NULL anymore but instead returns "rowid" and throws
// an error. To avoid that error (we don't actually care for the value of this column, so the value is not the issue here) we
// explicitly select NULL (without any quotes) here.
if(m_is_view && !hasCustomRowIdColumn())
selector = "NULL,";
else
selector = sqlb::escapeIdentifier(m_rowid_columns.at(0)) + ",";
} else {
selector += "sqlb_make_single_value(";
for(size_t i=0;i<m_rowid_columns.size();i++)
selector += sqlb::escapeIdentifier(m_rowid_columns.at(i)) + ",";
selector.pop_back(); // Remove the last comma
selector += "),";
}
}
if(m_selected_columns.empty())
{
selector += "*";
} else {
for(const auto& it : m_selected_columns)
{
if (it.original_column != it.selector)
selector += it.selector + " AS " + sqlb::escapeIdentifier(it.original_column) + ",";
else
selector += sqlb::escapeIdentifier(it.original_column) + ",";
}
selector.pop_back();
}
// Filter
std::string where = buildWherePart();
// Sorting
std::string order_by;
for(const auto& sorted_column : m_sort)
order_by += sorted_column.toSql() + ",";
if(order_by.size())
{
order_by.pop_back();
order_by = "ORDER BY " + order_by;
}
return "SELECT " + selector + " FROM " + m_table.toString() + " " + where + " " + order_by;
}
std::string Query::buildCountQuery() const
{
// Build simplest count query for this (filtered) table
return "SELECT COUNT(*) FROM " + m_table.toString() + " " + buildWherePart();
}
std::vector<SelectedColumn>::iterator Query::findSelectedColumnByName(const std::string& name)
{
return std::find_if(m_selected_columns.begin(), m_selected_columns.end(), [name](const SelectedColumn& c) {
return name == c.original_column;
});
}
std::vector<SelectedColumn>::const_iterator Query::findSelectedColumnByName(const std::string& name) const
{
return std::find_if(m_selected_columns.cbegin(), m_selected_columns.cend(), [name](const SelectedColumn& c) {
return name == c.original_column;
});
}
}