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LibSQL: Invent statement execution machinery and CREATE SCHEMA statement

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This patch introduces the ability execute parsed SQL statements. The
abstract AST Statement node now has a virtual 'execute' method. This
method takes a Database object as parameter and returns a SQLResult
object.

Also introduced here is the CREATE SCHEMA statement. Tables live in a
schema, and if no schema is present in a table reference the 'default'
schema is implied. This schema is created if it doesn't yet exist when
a Database object is created.

Finally, as a proof of concept, the CREATE SCHEMA and CREATE TABLE
statements received an 'execute' implementation. The CREATE TABLE
method is not able to create tables created from SQL queries yet.
This commit is contained in:
Jan de Visser 2021-06-27 21:32:22 -04:00 • committed by Ali Mohammad Pur
parent 30691549fd
commit 1037d6b0eb
9 changed files with 147 additions and 33 deletions
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44
Userland/Libraries/LibSQL/AST/CreateTable.cpp Normal file
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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibSQL/AST/AST.h>
#include <LibSQL/Database.h>
namespace SQL::AST {
RefPtr<SQLResult> CreateTable::execute(NonnullRefPtr<Database> database) const
{
auto schema_name = (!m_schema_name.is_null() && !m_schema_name.is_empty()) ? m_schema_name : "default";
auto schema_def = database->get_schema(schema_name);
if (!schema_def)
return SQLResult::construct(SQLCommand::Create, SQLErrorCode::SchemaDoesNotExist, m_schema_name);
auto table_def = database->get_table(schema_name, m_table_name);
if (table_def) {
if (m_is_error_if_table_exists) {
return SQLResult::construct(SQLCommand::Create, SQLErrorCode::TableExists, m_table_name);
} else {
return SQLResult::construct(SQLCommand::Create);
}
}
table_def = TableDef::construct(schema_def, m_table_name);
for (auto& column : m_columns) {
SQLType type;
if (column.type_name()->name() == "VARCHAR" || column.type_name()->name() == "TEXT") {
type = SQLType::Text;
} else if (column.type_name()->name() == "INT" || column.type_name()->name() == "INTEGER") {
type = SQLType::Integer;
} else if (column.type_name()->name() == "FLOAT" || column.type_name()->name() == "NUMBER") {
type = SQLType::Float;
} else {
return SQLResult::construct(SQLCommand::Create, SQLErrorCode::InvalidType, column.type_name()->name());
}
table_def->append_column(column.name(), type);
}
database->add_table(*table_def);
return SQLResult::construct(SQLCommand::Create, 0, 1);
}
}