修复 ThinkPHP5 使用 PostgreSQL 12+ 高版本报错

ThinkPHP 使用 PostgreSQL 需要导入一个 pgsql.sql ，然而在PostgreSQL 12版本以后，pg_attrdef.adsrc 被移除了，因此会报错

将 pgsql.sql 中的

pg_attrdef.adsrc
1
替换为

pg_get_expr(pg_attrdef.adbin, pg_attribute.attrelid)
1
然后重新运行一次SQL即可

附：替换完成后的pgsql.sql内容

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_get_expr(pg_attrdef.adbin, pg_attribute.attrelid) 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 '获得表信息';

---重载一个函数
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 '获得表信息';