以php中的thinkphp 5.1为例，php容器连接mac中的pgsql数据库失败时，出现如下错误

[7] PDOException in Connection.php line 528
SQLSTATE[08006] [7] could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?

解决：以thinkphp 5.1为例，只需把 database.php 中的 hostname 改为 host.docker.internal 即可，然后，thinkphp 就能访问到数据库了。

return [// 数据库类型'type'            => 'pgsql',// 服务器地址'hostname'        => 'host.docker.internal'
];

如果可以访问后，再出现 table_msg(unknown) 如下错误时

SQLSTATE[42883]: Undefined function: 7 ERROR: function table_msg(unknown) does not exist
LINE 1: ...fault as "default",fields_default as "extra" from table_msg(...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.

解决：在数据库中执行如下sql即可（因为 table_msg 函数需要用户自己定义）

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 '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';