101 lines
2.8 KiB
PHP
101 lines
2.8 KiB
PHP
<?php
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namespace Driver\SQL\Query;
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use Driver\SQL\Column\Column;
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use Driver\SQL\Constraint\Constraint;
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use Driver\SQL\Constraint\ForeignKey;
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use Driver\SQL\Constraint\PrimaryKey;
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use Driver\SQL\SQL;
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class AlterTable extends Query {
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private string $table;
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private string $action;
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private ?Column $column;
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private ?Constraint $constraint;
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public function __construct(SQL $sql, string $table) {
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parent::__construct($sql);
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$this->table = $table;
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$this->column = null;
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$this->constraint = null;
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}
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public function add($what): AlterTable {
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if ($what instanceof Column) {
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$this->column = $what;
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} else if ($what instanceof Constraint) {
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$this->constraint = $what;
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} else {
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$this->column = new Column($what);
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}
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$this->action = "ADD";
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return $this;
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}
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public function modify(Column $column): AlterTable {
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$this->column = $column;
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$this->action = "MODIFY";
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return $this;
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}
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public function drop($what): AlterTable {
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if ($what instanceof Column) {
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$this->column = $what;
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} else if ($what instanceof Constraint) {
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$this->constraint = $what;
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} else {
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$this->column = new Column($what);
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}
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$this->action = "DROP";
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return $this;
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}
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public function getAction(): string { return $this->action; }
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public function getColumn(): ?Column { return $this->column; }
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public function getConstraint(): ?Constraint { return $this->constraint; }
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public function getTable(): string { return $this->table; }
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public function build(array &$params): ?string {
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$tableName = $this->sql->tableName($this->getTable());
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$action = $this->getAction();
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$column = $this->getColumn();
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$constraint = $this->getConstraint();
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$query = "ALTER TABLE $tableName $action ";
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if ($column) {
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$query .= "COLUMN ";
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if ($action === "DROP") {
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$query .= $this->sql->columnName($column->getName());
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} else {
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// ADD or modify
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$query .= $this->sql->getColumnDefinition($column);
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}
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} else if ($constraint) {
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if ($action === "DROP") {
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if ($constraint instanceof PrimaryKey) {
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$query .= "PRIMARY KEY";
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} else if ($constraint instanceof ForeignKey) {
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// TODO: how can we pass the constraint name here?
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$this->sql->setLastError("DROP CONSTRAINT foreign key is not supported yet.");
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return null;
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}
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} else if ($action === "ADD") {
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$query .= "CONSTRAINT ";
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$query .= $this->sql->getConstraintDefinition($constraint);
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} else if ($action === "MODIFY") {
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$this->sql->setLastError("MODIFY CONSTRAINT foreign key is not supported.");
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return null;
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}
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} else {
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$this->sql->setLastError("ALTER TABLE requires at least a column or a constraint.");
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return null;
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}
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return $query;
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}
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} |