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a bit of work on conversion functions

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vaclavt
2022-04-03 16:46:39 +02:00
parent aca52899fb
commit dadad69958
7 changed files with 81 additions and 25 deletions
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22
usql_dml.cpp
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@@ -217,7 +217,7 @@ ColDefNode USql::get_db_column_definition(Table *table, Node *node) {
throw Exception("Undefined table node - get_db_column_definition");
}
std::tuple<int, ColDefNode> USql::get_node_definition(Table *table, Node * node, const std::string & col_name, int col_order ) {
std::tuple<int, ColDefNode> USql::get_node_definition(Table *table, Node * node, const std::string &col_name, int col_order ) {
if (node->node_type == NodeType::database_value) {
ColDefNode src_col_def = get_db_column_definition(table, node);
ColDefNode col_def = ColDefNode{col_name, src_col_def.type, col_order, src_col_def.length, src_col_def.null};
@@ -226,9 +226,15 @@ std::tuple<int, ColDefNode> USql::get_node_definition(Table *table, Node * node,
} else if (node->node_type == NodeType::function) {
auto func_node = static_cast<FunctionNode *>(node);
if (func_node->function == FunctionNode::Type::to_string) {
if (func_node->function == FunctionNode::Type::to_char) {
ColDefNode col_def = ColDefNode{col_name, ColumnType::varchar_type, col_order, 32, true};
return std::make_tuple(FUNCTION_CALL, col_def);
} else if (func_node->function == FunctionNode::Type::to_int) {
ColDefNode col_def = ColDefNode{col_name, ColumnType::integer_type, col_order, 1, true};
return std::make_tuple(FUNCTION_CALL, col_def);
} else if (func_node->function == FunctionNode::Type::to_float) {
ColDefNode col_def = ColDefNode{col_name, ColumnType::float_type, col_order, 1, true};
return std::make_tuple(FUNCTION_CALL, col_def);
} else if (func_node->function == FunctionNode::Type::to_date) {
ColDefNode col_def = ColDefNode{col_name, ColumnType::integer_type, col_order, 1, true};
return std::make_tuple(FUNCTION_CALL, col_def);
@@ -243,18 +249,26 @@ std::tuple<int, ColDefNode> USql::get_node_definition(Table *table, Node * node,
// TODO handle cases here
if (func_node->params.empty()) throw Exception("Coalesce without parameters");
if (func_node->params[0]->node_type != NodeType::database_value) throw Exception("Coalesce first parameter must be database column");
ColDefNode tbl_col_def = get_db_column_definition(table, func_node->params[0].get());
ColDefNode col_def = ColDefNode{col_name, tbl_col_def.type, col_order, tbl_col_def.length, true};
return std::make_tuple(FUNCTION_CALL, col_def);
} else if (func_node->function == FunctionNode::Type::min || func_node->function == FunctionNode::Type::max) {
auto col_type= ColumnType::float_type;
auto col_type = ColumnType::float_type;
size_t col_len = 1;
auto & v = func_node->params[0];
auto &v = func_node->params[0];
if (v->node_type == NodeType::database_value) {
ColDefNode src_col_def = get_db_column_definition(table, v.get());
col_type = src_col_def.type;
col_len = src_col_def.length;
} else if (node->node_type == NodeType::function) {
std::tuple<int, ColDefNode> fun_type = get_node_definition(table, static_cast<Node*>(& *v), "", 0);
col_type = std::get<1>(fun_type).type;
col_len = std::get<1>(fun_type).length;
}
ColDefNode col_def = ColDefNode{col_name, col_type, col_order, col_len, true};
return std::make_tuple(FUNCTION_CALL, col_def);
} else if (func_node->function == FunctionNode::Type::count) {