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statement_executor.c
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statement_executor.c
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//
// Created by Colin Peppler on 1/5/20.
//
#include "statement_executor.h"
ExecuteResult execute_statement(Statement *statement, Table *table) {
switch (statement->type) {
case (STATEMENT_INSERT):
return execute_insert(statement, table);
case (STATEMENT_SELECT):
return execute_select(statement, table);
}
}
ExecuteResult execute_insert(Statement *statement, Table *table) {
Row *row_to_insert = &(statement->row_to_insert);
uint32_t key_to_insert = row_to_insert->id;
Cursor *cursor = table_find(table, key_to_insert);
void *node = get_page(table->pager, table->root_page_num);
uint32_t num_cells = *leaf_node_num_cells(node);
if (cursor->cell_num < num_cells) {
uint32_t key_at_index = *leaf_node_key(node, cursor->cell_num);
if (key_at_index == key_to_insert) {
return EXECUTE_DUPLICATE_KEY;
}
}
leaf_node_insert(cursor, row_to_insert->id, row_to_insert);
free(cursor);
return EXECUTE_SUCCESS;
}
ExecuteResult execute_select(Statement *statement, Table *table) {
Cursor *cursor = get_start_table_cursor(table);
Row row;
while (!cursor->is_end_of_table) {
deserialize_row(cursor_value(cursor), &row);
print_row(&row);
cursor_advance(cursor);
}
free(cursor);
return EXECUTE_SUCCESS;
}