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32 lines
878 B
PHP
32 lines
878 B
PHP
<?php
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defined('BASEPATH') OR exit('No direct script access allowed');
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class Migration_add_pk_iota extends CI_Migration {
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public function up() {
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$this->add_ix('iota','idx_iota_Tag','`tag`');
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}
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public function down() {
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$this->rm_ix('iota','idx_iota_Tag');
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}
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private function add_ix($table_name,$index,$cols) {
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$ix_exist = $this->db->query("SHOW INDEX FROM ".$table_name." WHERE Key_name = '".$index."'")->num_rows();
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if ($ix_exist == 0) {
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$sql = "CREATE UNIQUE INDEX `idx_iota_Tag` ON `iota` (Tag) COMMENT '' ALGORITHM DEFAULT LOCK DEFAULT";
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$this->db->query($sql);
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}
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}
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private function rm_ix($table_name,$index) {
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$ix_exist = $this->db->query("SHOW INDEX FROM ".$table_name." WHERE Key_name = '".$index."'")->num_rows();
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if ($ix_exist >= 1) {
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$sql = "ALTER TABLE ".$table_name." DROP INDEX `".$index."`;";
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$this->db->query($sql);
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}
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}
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}
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