116 lines
3.1 KiB
PHP
116 lines
3.1 KiB
PHP
<?php namespace System\DB\Query;
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class Compiler {
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/**
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* Build a SQL SELECT statement.
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*
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* @param Query $query
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* @return string
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*/
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public static function select($query)
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{
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// ----------------------------------------------------
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// Add the SELECT, FROM, and WHERE clause to the query.
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// ----------------------------------------------------
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$sql = $query->select.' '.$query->from.' '.$query->where;
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// ----------------------------------------------------
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// Add the ORDER BY clause to the query.
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// ----------------------------------------------------
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if (count($query->orderings) > 0)
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{
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$sql .= ' ORDER BY '.implode(', ', $query->orderings);
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}
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// ----------------------------------------------------
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// Add the LIMIT clause to the query.
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// ----------------------------------------------------
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if ( ! is_null($query->limit))
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{
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$sql .= ' LIMIT '.$query->limit;
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}
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// ----------------------------------------------------
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// Add the OFFSET clause to the query.
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// ----------------------------------------------------
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if ( ! is_null($query->offset))
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{
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$sql .= ' OFFSET '.$query->offset;
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}
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return $sql;
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}
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/**
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* Build a SQL INSERT statement.
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*
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* @param Query $query
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* @param array $values
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* @return string
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*/
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public static function insert($query, $values)
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{
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// -----------------------------------------------------
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// Begin the INSERT statement.
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// -----------------------------------------------------
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$sql = 'INSERT INTO '.$query->table.' (';
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// ----------------------------------------------------
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// Wrap each column name in keyword identifiers.
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// ----------------------------------------------------
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$columns = array();
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foreach (array_keys($values) as $column)
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{
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$columns[] = $query->wrap($column);
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}
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// -----------------------------------------------------
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// Concatenante the columns and values to the statement.
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// -----------------------------------------------------
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return $sql .= implode(', ', $columns).') VALUES ('.$query->parameterize($values).')';
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}
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/**
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* Build a SQL UPDATE statement.
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*
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* @param Query $query
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* @param array $values
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* @return string
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*/
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public static function update($query, $values)
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{
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// ----------------------------------------------------
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// Initialize the UPDATE statement.
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// ----------------------------------------------------
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$sql = 'UPDATE '.$query->table.' SET ';
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// ---------------------------------------------------
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// Add each column set the statement.
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// ---------------------------------------------------
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$columns = array();
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foreach (array_keys($values) as $column)
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{
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$columns[] = $query->wrap($column).' = ?';
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}
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// ---------------------------------------------------
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// Concatenate the SETs to the statement.
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// ---------------------------------------------------
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return $sql .= implode(', ', $columns).' '.$query->where;
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}
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/**
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* Build a SQL DELETE statement.
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*
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* @param Query $query
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* @return string
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*/
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public static function delete($query)
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{
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return 'DELETE FROM '.$query->wrap($query->table).' '.$query->where;
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}
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} |