修复 ThinkPHP 使用 PostgreSQL 12+ 高版本报错 Column adsrc doesn't exist

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Column adsrc doesn't exist

解决方法：

将pgsql.sql中的

pg_attrdef.adsrc

替换为

pg_get_expr(pg_attrdef.adbin, pg_attribute.attrelid)

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';