Implement CREATE VIEW and DROP VIEW

This commit is contained in:
Pedro 2017-03-08 17:42:33 +01:00
parent 96f8b04359
commit 39d0dbd9af
4 changed files with 34 additions and 8 deletions

View File

@ -343,6 +343,13 @@ create_statement:
$$->tableName = $4;
$$->columns = $6;
}
| CREATE VIEW opt_not_exists table_name opt_column_list AS select_statement {
$$ = new CreateStatement(CreateStatement::kView);
$$->ifNotExists = $3;
$$->tableName = $4;
$$->viewColumns = $5;
$$->select = $7;
}
;
opt_not_exists:
@ -380,6 +387,10 @@ drop_statement:
$$ = new DropStatement(DropStatement::kTable);
$$->name = $3;
}
| DROP VIEW table_name {
$$ = new DropStatement(DropStatement::kView);
$$->name = $3;
}
| DEALLOCATE PREPARE IDENTIFIER {
$$ = new DropStatement(DropStatement::kPreparedStatement);
$$->name = $3;

View File

@ -5,9 +5,12 @@
// Note: Implementations of constructors and destructors can be found in statements.cpp.
namespace hsql {
struct SelectStatement;
// Represents definition of a table column
struct ColumnDefinition {
enum DataType {
UNKNOWN,
TEXT,
INT,
DOUBLE
@ -26,7 +29,8 @@ namespace hsql {
struct CreateStatement : SQLStatement {
enum CreateType {
kTable,
kTableFromTbl // Hyrise file format
kTableFromTbl, // Hyrise file format
kView
};
CreateStatement(CreateType type);
@ -37,6 +41,8 @@ namespace hsql {
char* filePath; // default: NULL
char* tableName; // default: NULL
std::vector<ColumnDefinition*>* columns; // default: NULL
std::vector<char*>* viewColumns;
SelectStatement* select;
};
} // namespace hsql

View File

@ -29,11 +29,14 @@ namespace hsql {
ifNotExists(false),
filePath(NULL),
tableName(NULL),
columns(NULL) {};
columns(NULL),
viewColumns(NULL),
select(NULL) {};
CreateStatement::~CreateStatement() {
free(filePath);
free(tableName);
delete select;
if (columns != NULL) {
for (ColumnDefinition* def : *columns) {
@ -41,6 +44,13 @@ namespace hsql {
}
delete columns;
}
if (viewColumns != NULL) {
for (char* column : *viewColumns) {
free(column);
}
delete viewColumns;
}
}
// DeleteStatement

View File

@ -42,10 +42,10 @@ WHERE L_PARTKEY = P_PARTKEY AND L_SHIPDATE >= '1995-09-01' AND L_SHIPDATE < date
-- TPC_H Query 15.1 - Create View for Top Supplier Query
-- CREATE VIEW REVENUE0 (SUPPLIER_NO, TOTAL_REVENUE) AS
-- SELECT L_SUPPKEY, SUM(L_EXTENDEDPRICE*(1-L_DISCOUNT)) FROM LINEITEM
-- WHERE L_SHIPDATE >= '1996-01-01' AND L_SHIPDATE < dateadd(mm, 3, cast('1996-01-01' as datetime))
-- GROUP BY L_SUPPKEY;
CREATE VIEW REVENUE0 (SUPPLIER_NO, TOTAL_REVENUE) AS
SELECT L_SUPPKEY, SUM(L_EXTENDEDPRICE*(1-L_DISCOUNT)) FROM LINEITEM
WHERE L_SHIPDATE >= '1996-01-01' AND L_SHIPDATE < dateadd(mm, 3, cast('1996-01-01' as datetime))
GROUP BY L_SUPPKEY;
-- TPC_H Query 15.2 - Top Supplier
@ -55,5 +55,4 @@ WHERE S_SUPPKEY = SUPPLIER_NO AND TOTAL_REVENUE = (SELECT MAX(TOTAL_REVENUE) FRO
ORDER BY S_SUPPKEY;
-- TPC_H Query 15.3 - Drop View
-- DROP VIEW REVENUE0;
DROP VIEW REVENUE0;