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。