57 lines
1.4 KiB
PHP
57 lines
1.4 KiB
PHP
<?php
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namespace core\db;
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/**
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* SQL 辅助类
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*/
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class Sql
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{
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// 构建 INSERT 语句
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public static function insert($table, $data)
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{
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$fields = implode(', ', array_keys($data));
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$placeholders = ':' . implode(', :', array_keys($data));
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return 'INSERT INTO ' . $table . ' (' . $fields . ') VALUES (' . $placeholders . ')';
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}
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// 构建 UPDATE 语句
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public static function update($table, $data, $where = '')
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{
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$set = array();
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foreach ($data as $key => $value) {
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$set[] = $key . ' = :' . $key;
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}
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$sql = 'UPDATE ' . $table . ' SET ' . implode(', ', $set);
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if ($where) {
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$sql .= ' WHERE ' . $where;
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}
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return $sql;
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}
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// 构建 SELECT 语句
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public static function select($table, $fields = '*', $where = '', $order = '', $limit = '')
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{
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$sql = 'SELECT ' . $fields . ' FROM ' . $table;
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if ($where) {
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$sql .= ' WHERE ' . $where;
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}
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if ($order) {
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$sql .= ' ORDER BY ' . $order;
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}
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if ($limit) {
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$sql .= ' LIMIT ' . $limit;
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}
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return $sql;
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}
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// 构建 DELETE 语句
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public static function delete($table, $where = '')
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{
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$sql = 'DELETE FROM ' . $table;
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if ($where) {
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$sql .= ' WHERE ' . $where;
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}
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return $sql;
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}
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}
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