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';