thinkphp連接PostgreSQL數據庫的BUG

在ThinkPHP Controller裏一個簡單的M('user')調用就會出錯。排除了數據庫配置方面的原因。

有多個網友詳細的描述了這個錯誤現象，我遇到的錯誤跟他們是一樣的。

http://www.thinkphp.cn/topic/30273.html 

http://www.thinkphp.cn/bug/3200.html * 

http://www.thinkphp.cn/bug/3332.html 

http://www.thinkphp.cn/bug/3413.html * 

http://www.thinkphp.cn/bug/3525.html

這些鏈接都指向同一個錯誤。

解決辦法

上面帶 * 號的兩個鏈接裏面各有部分解決方案，加起來正好能夠解決問題。

好吧，我具體說一下如何解決這個錯誤，共兩項操作，希望對某些朋友有幫助：

在 PostgreSQL 裏添加自定義函數 table_msg

複製以下代碼到SQL管理器裏執行即可：

注意：我滿世界搜索都找不到 table_msg 的權威出處，只有這麼一個第三方的文章：http://lovejuan1314.iteye.com/blog/1167680。

CREATE OR REPLACE FUNCTION pgsql_type(a_type varchar) RETURNS varchar AS
$BODY$
DECLARE
     v_type varchar;
BEGIN
     IF a_type='int8' THEN
          v_type:='bigint';
     ELSIF a_type='int4' THEN
          v_type:='integer';
     ELSIF a_type='int2' THEN
          v_type:='smallint';
     ELSIF a_type='bpchar' THEN
          v_type:='char';
     ELSE
          v_type:=a_type;
     END IF;
     RETURN v_type;
END;
$BODY$
LANGUAGE PLPGSQL;

CREATE TYPE "public"."tablestruct" AS (
  "fields_key_name" varchar(100),
  "fields_name" VARCHAR(200),
  "fields_type" VARCHAR(20),
  "fields_length" BIGINT,
  "fields_not_null" VARCHAR(10),
  "fields_default" VARCHAR(500),
  "fields_comment" VARCHAR(1000)
);

CREATE OR REPLACE FUNCTION "public"."table_msg" (a_schema_name varchar, a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS
$body$
DECLARE
     v_ret tablestruct;
     v_oid oid;
     v_sql varchar;
     v_rec RECORD;
     v_key varchar;
BEGIN
     SELECT
           pg_class.oid  INTO v_oid
     FROM
           pg_class
           INNER JOIN pg_namespace ON (pg_class.relnamespace = pg_namespace.oid AND lower(pg_namespace.nspname) = a_schema_name)
     WHERE
           pg_class.relname=a_table_name;
     IF NOT FOUND THEN
         RETURN;
     END IF;

     v_sql='
     SELECT
           pg_attribute.attname AS fields_name,
           pg_attribute.attnum AS fields_index,
           pgsql_type(pg_type.typname::varchar) AS fields_type,
           pg_attribute.atttypmod-4 as fields_length,
           CASE WHEN pg_attribute.attnotnull  THEN ''not null''
           ELSE ''''
           END AS fields_not_null,
           pg_attrdef.adsrc AS fields_default,
           pg_description.description AS fields_comment
     FROM
           pg_attribute
           INNER JOIN pg_class  ON pg_attribute.attrelid = pg_class.oid
           INNER JOIN pg_type   ON pg_attribute.atttypid = pg_type.oid
           LEFT OUTER JOIN pg_attrdef ON pg_attrdef.adrelid = pg_class.oid AND pg_attrdef.adnum = pg_attribute.attnum
           LEFT OUTER JOIN pg_description ON pg_description.objoid = pg_class.oid AND pg_description.objsubid = pg_attribute.attnum
     WHERE
           pg_attribute.attnum > 0
           AND attisdropped <> ''t''
           AND pg_class.oid = ' || v_oid || '
     ORDER BY pg_attribute.attnum' ;

     FOR v_rec IN EXECUTE v_sql LOOP
         v_ret.fields_name=v_rec.fields_name;
         v_ret.fields_type=v_rec.fields_type;
         IF v_rec.fields_length > 0 THEN
            v_ret.fields_length:=v_rec.fields_length;
         ELSE
            v_ret.fields_length:=NULL;
         END IF;
         v_ret.fields_not_null=v_rec.fields_not_null;
         v_ret.fields_default=v_rec.fields_default;
         v_ret.fields_comment=v_rec.fields_comment;
         SELECT constraint_name INTO v_key FROM information_schema.key_column_usage WHERE table_schema=a_schema_name AND table_name=a_table_name AND column_name=v_rec.fields_name;
         IF FOUND THEN
            v_ret.fields_key_name=v_key;
         ELSE
            v_ret.fields_key_name='';
         END IF;
         RETURN NEXT v_ret;
     END LOOP;
     RETURN ;
END;
$body$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

COMMENT ON FUNCTION "public"."table_msg"(a_schema_name varchar, a_table_name varchar)
IS '獲得表信息';

---重載一個函數
CREATE OR REPLACE FUNCTION "public"."table_msg" (a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS
$body$
DECLARE
    v_ret tablestruct;
BEGIN
    FOR v_ret IN SELECT * FROM table_msg('public',a_table_name) LOOP
        RETURN NEXT v_ret;
    END LOOP;
    RETURN;
END;
$body$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

COMMENT ON FUNCTION "public"."table_msg"(a_table_name varchar)
IS '獲得表信息';

****修改 ThinkPHP 源代碼裏面的 BUG

把 ThinkPHP\Library\Think\Db\Driver\Pgsql.class.php 第 41 行 修改爲：

$result =   $this->query('

select fields_name as "field",fields_type as "type",fields_not_null as "null",fields_key_name as "key",fields_default

 as "default",fields_default as "extra" from table_msg(\''.$tableName.'\');');

也就是在 $tableName 前後各添加一個單引號，('.$tableName.') => (\''.$tableName.'\')。

感受

ThinkPHP 3.2.3 對 PostgreSQL 9.4.4 的支持度很差，連最基本的測試都不通過。多個網友報告BUG，幾個月過去了居然還沒有官方解決方案。他們居然調用了table_msg這個不存在的函數，而這個函數的定義代碼需要我到第三方網站上去找。

除了上面的問題，我還發現，M('table')->add()不能正常的返回新增記錄的主鍵id值。

我不知道ThinkPHP他們哪來的勇氣說支持PostgreSQL。