93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
#include "CodeBuilder.h"
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#include "Pgsql_Result.h"
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#include "IndentationConfig.h"
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#include "LanguageConfig.h"
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#include "StructureTemplate.h"
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#include "util.h"
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#include <QTextStream>
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void CodeBuilder::GenCodeForExecutingQuery(QTextStream &q, const QString &query, const Pgsql::Result &result)
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{
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// %1 query string
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// %2 struct_name
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// %3 list of field assignments
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QString exec_query_template = "Pgsql::Result result = conn.query(%1);";
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QString loop_start_template =
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"Pgsql::Result result = conn.query(/%query_literal%/);"
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"for (auto row: result) {\n"
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" Pgsql::Col col(row);\n"
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" /%struct_type%/ v;\n"
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"/%assign_fields%/"
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"}";
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// %field_name%
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// %column_name%
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// %column_index%
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QString assign_result_field_template = "col >> v./%field_name%/";
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QString query_string_literal = ConvertToMultiLineCString(query);
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// [optional] Gen declaration of result structure
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GenReturnStructDefinition(q, result);
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// assume we have connection? What name???
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// gen code for creating and executing statement
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// - bind parameters
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// Gen code for iterating through result and filling the result struct/or local variables
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}
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void CodeBuilder::GenReturnStructDefinition(QTextStream &q, const Pgsql::Result &result) const
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{
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std::shared_ptr<const StructureTemplate> templ = m_configuration->structureTemplate();
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QString struct_name = "TODO";
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QString field_format = templ->m_fieldTemplate;
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int field_indent_levels = templ->m_fieldIndentation;
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QString field_indent_string = m_configuration->indentationConfig()->getIndentString(field_indent_levels);
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// Make struct start
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q << QString(templ->m_startTemplate).arg(struct_name);
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// Process fields
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for (int column = 0; column < result.cols(); ++column) {
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QString res_col_name = result.getColName(column);
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Oid type_oid = result.type(column);
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q << field_indent_string;
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genFieldDeclaration(q, field_format, res_col_name, type_oid);
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q << "\n";
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// Unfortunatly there is no easy reliable way to determine if a column can contain null values
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// For simple result columns we can have a look at the original column and if that has a NOT NULL constraint
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// then we can assume NOT NULL for the result if there are no LEFT/RIGHT JOINS or other constructs that can introduce NULL
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// values
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// Any way at generation time we might want to be able to specify the null handle
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// - exception/error return
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// - magic value
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// - boost::optional
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// - boolean flags
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// - null pointer (useful for languages where this has no cost, other cases boolean flags will be more performant)
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}
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// Finish struct
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q << QString(templ->m_endTemplate).arg(struct_name);
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}
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QString CodeBuilder::columnNameToVariableName(QString column_name) const
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{
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return m_configuration->columnNameToFieldName(column_name);
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}
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QString CodeBuilder::getTypeName(Oid dbtype) const
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{
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return m_configuration->getTypeName(dbtype);
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}
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void CodeBuilder::genFieldDeclaration(QTextStream &q, const QString &format, const QString &column_name, Oid column_type) const
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{
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QString field_name = columnNameToVariableName(column_name);
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QString type_name = getTypeName(column_type);
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q << QString(format).arg(field_name).arg(type_name);
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}
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