extended tableref and implemented helper function to print select statements
This commit is contained in:
Pedro
parent
c6cd391301
commit
eb6444fd2f
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@ -4,7 +4,7 @@
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PARSER = bison
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LIB_FILES = $(PARSER)/$(PARSER)_parser.cpp $(PARSER)/flex_lexer.cpp $(PARSER)/SQLParser.cpp lib/Statement.cpp lib/Expr.cpp
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LIB_FILES = $(PARSER)/$(PARSER)_parser.cpp $(PARSER)/flex_lexer.cpp $(PARSER)/SQLParser.cpp lib/Statement.cpp lib/Expr.cpp lib/sqlhelper.cpp
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TESTS_MAIN = sql_tests.cpp
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TESTS_BIN = bin/tests
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@ -71,6 +71,7 @@ typedef void* yyscan_t;
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List<char*>* slist;
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List<Expr*>* explist;
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List<TableRef*>* tbllist;
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}
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@ -92,11 +93,11 @@ typedef void* yyscan_t;
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%type <statement> statement
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%type <select_statement> select_statement
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%type <sval> table_name
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%type <table> from_clause table_exp
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%type <table> from_clause table_ref table_ref_atomic
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%type <expr> expr column_name scalar_exp literal
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%type <expr> comparison_predicate predicate search_condition where_clause
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%type <slist> table_ref_commalist
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%type <explist> expr_list group_clause select_list
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%type <tbllist> table_ref_commalist
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@ -146,7 +147,7 @@ select_list:
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from_clause:
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FROM table_exp { $$ = $2; }
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FROM table_ref { $$ = $2; }
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;
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@ -162,21 +163,6 @@ group_clause:
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;
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// TODO: comma_list with mixed table names and select statements
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table_exp:
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table_ref_commalist {
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TableRef* t = new TableRef(eTableName);
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t->table_names = $1;
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$$ = t;
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}
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| '(' select_statement ')' {
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TableRef* t = new TableRef(eTableSelect);
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t->stmt = $2;
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$$ = t;
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}
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;
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// TODO: multiple predicates
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search_condition:
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predicate
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@ -214,10 +200,6 @@ column_name:
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NAME { $$ = makeColumnRef($1); }
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;
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table_name:
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NAME
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| NAME '.' NAME
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;
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literal:
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STRING { $$ = makeStringLiteral($1); }
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@ -231,20 +213,47 @@ opt_semicolon:
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;
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/******************************
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** Lists
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******************************/
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expr_list:
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expr { $$ = new List<Expr*>($1); }
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| expr_list ',' expr { $1->push_back($3); $$ = $1; }
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;
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// TODO: add table_ref to include names and select queries
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table_ref_commalist:
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table_name { $$ = new List<char*>($1); }
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| table_ref_commalist ',' table_name { $1->push_back($3); $$ = $1; }
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/******************************
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** Table
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******************************/
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table_ref:
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table_ref_atomic
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| table_ref_atomic ',' table_ref_commalist {
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$3->push_back($1);
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auto tbl = new TableRef(eTableCrossProduct);
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tbl->list = $3;
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$$ = tbl;
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}
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;
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table_ref_atomic:
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table_name {
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auto tbl = new TableRef(eTableName);
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tbl->name = $1;
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$$ = tbl;
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}
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| '(' select_statement ')' {
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auto tbl = new TableRef(eTableSelect);
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tbl->stmt = $2;
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$$ = tbl;
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}
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;
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table_ref_commalist:
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table_ref_atomic { $$ = new List<TableRef*>($1); }
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| table_ref_commalist ',' table_ref_atomic { $1->push_back($3); $$ = $1; }
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;
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table_name:
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NAME
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| NAME '.' NAME
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;
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%%
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@ -4,5 +4,5 @@ make clean
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make tests
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./bin/tests
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# make execution
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# ./bin/sql_execution "SELECT col1, col2 FROM table GROUP BY col1;"
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make execution
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./bin/sql_execution "SELECT col1, col2 FROM table, (SELECT * FROM a, table, (SELECT * FROM (SELECT * FROM foo))) GROUP BY col1;"
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@ -9,16 +9,20 @@ class SelectStatement;
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*/
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typedef enum {
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eTableName,
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eTableSelect
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eTableSelect,
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eTableCrossProduct
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} ETableRefType;
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typedef struct TableRef TableRef;
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struct TableRef {
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TableRef(ETableRefType type) : type(type) {}
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ETableRefType type;
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char* name;
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SelectStatement* stmt;
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List<char*>* table_names;
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List<TableRef*>* list;
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};
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@ -0,0 +1,40 @@
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#include "sqlhelper.h"
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#include <stdio.h>
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#include <string>
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const char* indent(uint num_indent) { return std::string(num_indent, ' ').c_str(); }
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void inprint(int val, uint num_indent) { printf("%s%d\n", indent(num_indent), val); }
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void inprint(float val, uint num_indent) { printf("%s%f\n", indent(num_indent), val); }
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void inprint(const char* val, uint num_indent) { printf("%s%s\n", indent(num_indent), val); }
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void printTableRefInfo(TableRef* table, uint num_indent) {
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switch (table->type) {
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case eTableName:
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inprint(table->name, num_indent);
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break;
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case eTableSelect:
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printSelectStatementInfo(table->stmt, num_indent);
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break;
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case eTableCrossProduct:
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for (TableRef* tbl : table->list->_vector) printTableRefInfo(tbl, num_indent);
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break;
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}
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}
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void printSelectStatementInfo(SelectStatement* stmt, uint num_indent) {
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inprint("SelectStatement", num_indent);
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inprint("Fields:", num_indent+1);
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for (Expr* expr : stmt->select_list->_vector) {
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switch (expr->type) {
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case eExprStar: inprint("*", num_indent+2); break;
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case eExprColumnRef: inprint(expr->name, num_indent+2); break;
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case eExprLiteralFloat: inprint(expr->float_literal, num_indent+2); break;
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case eExprLiteralString: inprint(expr->name, num_indent+2); break;
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case eExprFunctionRef: /* todo */ break;
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case eExprPredicate: /* todo */ break;
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}
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}
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inprint("Sources:", num_indent+1);
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printTableRefInfo(stmt->from_table, num_indent+2);
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}
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@ -0,0 +1,11 @@
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#ifndef __SQLHELPER_H__
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#define __SQLHELPER_H__
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#include "Statement.h"
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void printSelectStatementInfo(SelectStatement* stmt, uint num_indent);
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#endif
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@ -1,11 +1,8 @@
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#include "SQLParser.h"
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#include <stdio.h>
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#include <string>
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typedef int* Table;
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Table executeSelect(SelectStatement* stmt);
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#include "lib/sqlhelper.h"
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#include "SQLParser.h"
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int main(int argc, char *argv[]) {
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if (argc <= 1) {
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@ -13,8 +10,6 @@ int main(int argc, char *argv[]) {
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return -1;
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}
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// Statement *stmt = NULL;
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for (int n = 1; n < argc; ++n) {
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char* sql = argv[n];
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@ -27,71 +22,11 @@ int main(int argc, char *argv[]) {
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}
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if (stmt->type == eSelect) {
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executeSelect((SelectStatement*)stmt);
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printSelectStatementInfo((SelectStatement*) stmt, 0);
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} else {
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fprintf(stderr, "Only Supporting Select Statements!\n");
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}
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}
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return 0;
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}
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// Dummy Database
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int NUM_COLUMNS = 4;
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int NUM_ROWS = 100;
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int TABLE[] = {40,59,8,7,74,28,7,10,15,17,2,20,15,82,41,20,25,72,89,67,74,0,70,31,67,75,74,30,0,45,82,6,9,35,73,83,13,46,39,45,28,34,11,41,20,30,72,78,51,36,32,71,16,70,39,88,59,25,0,68,73,54,0,4,7,35,19,4,6,23,30,25,51,31,52,14,65,95,95,85,94,90,65,35,51,64,68,44,80,7,78,23,99,30,17,72,8,22,40,47,15,30,9,51,77,9,67,94,15,69,49,21,51,99,91,36,5,91,69,55,36,36,74,63,1,87,24,67,51,52,21,10,60,37,6,43,53,4,25,35,19,4,61,61,16,83,9,69,32,46,36,74,96,47,90,27,48,48,79,95,55,64,48,40,42,77,33,18,36,80,23,24,1,75,2,63,9,23,17,99,82,56,9,92,17,94,76,35,28,86,61,58,38,61,16,4,69,61,51,33,53,23,6,48,81,62,46,51,61,34,97,100,53,7,41,61,45,15,46,91,85,29,73,75,39,24,99,38,0,32,68,23,76,25,62,40,58,67,85,33,18,51,70,45,27,62,30,89,85,53,87,91,61,37,33,69,2,2,9,24,23,55,45,76,0,59,72,12,75,5,10,52,59,32,34,24,86,72,97,2,5,4,0,70,6,98,29,22,11,69,74,90,19,12,68,7,55,22,70,83,20,72,88,61,46,38,98,4,15,63,14,42,16,94,100,33,58,65,53,56,26,94,63,80,88,22,49,20,57,81,89,30,82,83,62,87,21,91,36,98,78,53,24,69,60,31,24,71,9,95,94,30,42,35,97,56,51,14,31,0,73,80,11,83,77,9,51,93,37,16,41,99,24,93,100,12,23,59,61,36,70,69,100,4,14,73,47,81,54,44,12,34,14,55,95,19,79,95,77,69};
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int getValue(int col, int row) {
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return TABLE[row*NUM_COLUMNS+col];
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}
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int getValue(std::string col_name, int row) {
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if (col_name.compare("col1") == 0) return getValue(0, row);
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if (col_name.compare("col2") == 0) return getValue(1, row);
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if (col_name.compare("col3") == 0) return getValue(2, row);
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if (col_name.compare("col4") == 0) return getValue(3, row);
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return 0;
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}
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Table executeGroupBySelect(SelectStatement* stmt, Table source) {
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fprintf(stderr, "GROUP BY not yet implemented!\n");
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return NULL;
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}
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Table executeSelect(SelectStatement* stmt) {
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// Step 1:
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// Determine source table
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TableRef* from_table = stmt->from_table;
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Table source;
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if (from_table->type == eTableSelect) {
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// Nested Select Statements
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source = executeSelect(from_table->stmt);
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} else if (from_table->type == eTableName) {
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if (from_table->table_names->size() == 1) {
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if (std::string(from_table->table_names->at(0)).compare("table") == 0) {
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source = TABLE;
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} else {
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fprintf(stderr, "Couldn't find table!\n");
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return NULL;
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}
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} else {
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// Cross product of table
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fprintf(stderr, "We're not supporting cross product of tables atm.\n");
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return NULL;
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}
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}
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// Step 2
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// Check if group by
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if (stmt->group_by != NULL) {
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return executeGroupBySelect(stmt, source);
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}
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return NULL;
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}
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}
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