thinkphp5, 结合pgsql使用时, 要先运行这段sql代码

按照tp5的官方文档的说法, 必须这么做: 先执行一段sql代码

 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" ),
   "fields_name" ),
   "fields_type" ),
   "fields_length" BIGINT,
   "fields_not_null" ),
   "fields_default" ),
   "fields_comment" )
 );

 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;
           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';

;