Migrate install rewriting to new rewriters

2023-11-07 15:26:03 -08:00
parent 3754ae32e4
commit c60d8f90b1
11 changed files with 487 additions and 349 deletions
@@ -0,0 +1,60 @@
+<?php
+
+class ShowIndexSQLRewriter extends AbstractSQLRewriter
+{
+    public function rewrite(): string
+    {
+        $sql = $this->original();
+        $table = $this->extractTableNameFromShowIndex($sql);
+        return $this->generatePostgresShowIndexFrom($table);
+    }
+
+    /**
+     * Extracts table name from a "SHOW FULL COLUMNS" SQL statement.
+     *
+     * @param string $sql The SQL statement
+     * @return string|null The table name if found, or null otherwise
+     */
+    protected function extractVariableName($sql) {
+        $pattern = "/SHOW INDEX FROM ['\"`]?([^'\"`]+)['\"`]?/i";
+        if (preg_match($pattern, $sql, $matches)) {
+            return $matches[1];
+        }
+        return null;
+    }
+
+    /**
+     * Generates a PostgreSQL-compatible SQL query to mimic MySQL's "SHOW INDEX FROM".
+     *
+     * @param string $tableName The table name
+     * @return string The generated SQL query
+     */
+    function generatePostgresShowIndexFrom($tableName) {
+        $sql = <<<SQL
+        SELECT bc.relname AS "Table",
+            CASE WHEN i.indisunique THEN '0' ELSE '1' END AS "Non_unique",
+            CASE WHEN i.indisprimary THEN 'PRIMARY' WHEN bc.relname LIKE '%usermeta' AND ic.relname = 'umeta_key'
+                THEN 'meta_key' ELSE REPLACE( ic.relname, '' . $table . '_', '') END AS "Key_name",
+            a.attname AS "Column_name",
+            NULL AS "Sub_part"
+        FROM pg_class bc, pg_class ic, pg_index i, pg_attribute a
+        WHERE bc.oid = i.indrelid
+            AND ic.oid = i.indexrelid
+            AND (i.indkey[0] = a.attnum OR i.indkey[1] = a.attnum OR i.indkey[2] = a.attnum OR i.indkey[3] = a.attnum OR i.indkey[4] = a.attnum OR i.indkey[5] = a.attnum OR i.indkey[6] = a.attnum OR i.indkey[7] = a.attnum)
+            AND a.attrelid = bc.oid
+            AND bc.relname = '' . $tableName . ''
+            ORDER BY "Key_name", CASE a.attnum
+                WHEN i.indkey[0] THEN 0
+                WHEN i.indkey[1] THEN 1
+                WHEN i.indkey[2] THEN 2
+                WHEN i.indkey[3] THEN 3
+                WHEN i.indkey[4] THEN 4
+                WHEN i.indkey[5] THEN 5
+                WHEN i.indkey[6] THEN 6
+                WHEN i.indkey[7] THEN 7
+            END
+        SQL;
+
+        return $sql;
+    }
+}