最近在折腾greenplum，遇到一个蛋疼的问题，那就是获取表结构，也就是建表语句。大家都知道在MySQL里面是非常easy的，show create table table_name 就搞定了，在gpdb里面就没这么容易，在查询大量资料以后终于找到了方法。那就是自己定义一个函数去获取，函数中可以嵌套python代码，非常的方便。但是资料中的代码有大量错误，在经过几番调试以后终于可以使用了。
如果没有这个函数其实也可以获取表结构，那就是只能导出这个表的结构进行查看了。导出表结构的命令是：
pg_dump -s --table=tb1_partition_range_yyyymmdd testdb > tb1_partition_range_yyyymmdd.sql
查看表结构：
[gpadmin@mdw ~]$ cat tb1_partition_range_yyyymmdd.sql -- -- Greenplum Database database dump --
SET statement_timeout = 0;
SET client_encoding = ‘UTF8’;
SET standard_conforming_strings = off;
SET check_function_bodies = false;
SET client_min_messages = warning;
SET escape_string_warning = off;
SET search_path = public, pg_catalog;
SET default_tablespace = ‘’;
SET default_with_oids = false;
–
– Name: tb1_partition_range_yyyymmdd; Type: TABLE; Schema: public; Owner: gpadmin; Tablespace:
–
CREATE TABLE tb1_partition_range_yyyymmdd (
id numeric,
yyyymmdd date
)
WITH (appendonly=true, compresslevel=5) DISTRIBUTED BY (id) PARTITION BY RANGE(yyyymmdd)
(
PARTITION p20120811 START (‘2012-08-11’::date) END (‘2012-08-12’::date) WITH (tablename=‘tb1_partition_range_yyyymmdd_1_prt_p20120811’, orientation=row , appendonly=true, compresslevel=5 ),
PARTITION p20120812 START (‘2012-08-12’::date) END (‘2012-08-13’::date) WITH (tablename=‘tb1_partition_range_yyyymmdd_1_prt_p20120812’, orientation=row , appendonly=true, compresslevel=5 )
);
ALTER TABLE public.tb1_partition_range_yyyymmdd OWNER TO gpadmin;
–
– Name: idx_yyyymmdd; Type: INDEX; Schema: public; Owner: gpadmin; Tablespace:
–
CREATE INDEX idx_yyyymmdd ON tb1_partition_range_yyyymmdd USING btree (yyyymmdd);
–
– Greenplum Database database dump complete
–
还有一种方法就是\d table_name查看。这个只能查看字段信息啥的。
testdb=# \d+ tb1_partition_range_yyyymmdd Append-Only Table "public.tb1_partition_range_yyyymmdd" Column | Type | Modifiers | Storage | Description ----------+---------+-----------+---------+------------- id | numeric | | main | yyyymmdd | date | | plain | Compression Type: zlib Compression Level: 5 Block Size: 32768 Checksum: t Indexes: "idx_yyyymmdd" btree (yyyymmdd) Child tables: tb1_partition_range_yyyymmdd_1_prt_p20120811, tb1_partition_range_yyyymmdd_1_prt_p20120812 Has OIDs: no Options: appendonly=true, compresslevel=5 Distributed by: (id) Partition by: (yyyymmdd)
testdb=#
总体来说还是不太方便，下面创建一个自定义的函数进行查看：
1. 创建语言
CREATE PROCEDURAL LANGUAGE plpythonu;
2. 创建函数（代码如下）：
vim get_table_structure.sql
create or replace function get_table_structure(tablename text) returns text as $$ try: table_name = tablename.lower().split('.')[1] talbe_schema=tablename.lower().split('.')[0] except (IndexError): return 'Please in put "tableschema.table_name"' get_table_oid="select oid,reloptions,relkind from pg_class where oid='%s'::regclass"%(tablename) try: rv_oid=plpy.execute(get_table_oid,5) if not rv_oid: return 'Did not find any relation named"'+tablename +'".' except (Error): return 'Did not find any relation named"'+tablename +'".' table_oid=rv_oid[0]['oid'] rv_reloptions=rv_oid[0]['reloptions'] rv_relkind=rv_oid[0]['relkind'] create_sql=""; table_kind='table'; if rv_relkind !='r' and rv_relkind !='v': plpy.error('%s is not table or view'%(tablename)); elif rv_relkind=='v': get_view_def="select pg_get_viewdef(%s,'t') as viewdef;" % (table_oid) rv_viewdef=plpy.execute(get_view_def); create_sql='create view %s as \n' % (tablename) create_sql += rv_viewdef[0]['viewdef']+'\n'; table_kind='view' else: get_columns="select a.attname,pg_catalog.format_type(a.atttypid,a.atttypmod),\ (select substring(pg_catalog.pg_get_expr(d.adbin,d.adrelid) for 128) \ from pg_catalog.pg_attrdef d where d.adrelid=a.attrelid and d.adnum=a.attnum and a.atthasdef) \ as default,a.attnotnull as isnull from pg_catalog.pg_attribute \ a where a.attrelid= %s and a.attnum >0 and not a.attisdropped order by a.attnum;" % (table_oid); rv_columns=plpy.execute(get_columns)get_table_distribution1</span><span style="color: #808080;">=</span>"<span style="color: #0000ff;">select</span> attrnums <span style="color: #0000ff;">from</span> pg_catalog.gp_distribution_policy t <span style="color: #0000ff;">where</span> localoid <span style="color: #808080;">=</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;">" + table_oid + "</span><span style="color: #ff0000;">'</span><span style="color: #000000;"> " rv_distribution1</span><span style="color: #808080;">=</span>plpy.<span style="color: #0000ff;">execute</span>(get_table_distribution1,<span style="color: #800000; font-weight: bold;">500</span><span style="color: #000000;">) rv_distribution2</span><span style="color: #808080;">=</span><span style="color: #ff0000;">''</span> <span style="color: #0000ff;">if</span> rv_distribution1 <span style="color: #808080;">and</span> rv_distribution1<span style="color: #ff0000;">[</span><span style="color: #ff0000;">0</span><span style="color: #ff0000;">][</span><span style="color: #ff0000;">'attrnums'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: get_table_distribution2</span><span style="color: #808080;">=</span>"<span style="color: #0000ff;">select</span> attname <span style="color: #0000ff;">from</span> pg_attribute <span style="color: #0000ff;">where</span> attrelid<span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">"+table_oid+"</span><span style="color: #ff0000;">'</span> <span style="color: #808080;">and</span> attnum <span style="color: #808080;">in</span> (" <span style="color: #808080;">+</span> <span style="color: #ff00ff;">str</span>(rv_distribution1<span style="color: #ff0000;">[</span><span style="color: #ff0000;">0</span><span style="color: #ff0000;">][</span><span style="color: #ff0000;">'attrnums'</span><span style="color: #ff0000;">]</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">{</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">}</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">[</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]</span><span style="color: #ff0000;">'</span>)<span style="color: #808080;">+</span><span style="color: #000000;">")" rv_distribution2</span><span style="color: #808080;">=</span>plpy.<span style="color: #0000ff;">execute</span>(get_table_distribution2,<span style="color: #800000; font-weight: bold;">500</span><span style="color: #000000;">) create_sql</span><span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">create table %s (\n</span><span style="color: #ff0000;">'</span> <span style="color: #808080;">%</span><span style="color: #000000;"> (tablename) get_index</span><span style="color: #808080;">=</span>"<span style="color: #0000ff;">select</span> pg_get_indexdef(indexrelid) <span style="color: #0000ff;">as</span> indexdef <span style="color: #0000ff;">from</span> pg_index <span style="color: #0000ff;">where</span> indrelid<span style="color: #808080;">=%</span>s" <span style="color: #808080;">%</span><span style="color: #000000;"> (table_oid); rv_index</span><span style="color: #808080;">=</span>plpy.<span style="color: #0000ff;">execute</span><span style="color: #000000;">(get_index); get_parinfo1</span><span style="color: #808080;">=</span>"<span style="color: #0000ff;">select</span> attname <span style="color: #0000ff;">as</span> columnname <span style="color: #0000ff;">from</span> pg_attribute <span style="color: #0000ff;">where</span> attnum <span style="color: #808080;">=</span>(<span style="color: #0000ff;">select</span> paratts<span style="color: #ff0000;">[</span><span style="color: #ff0000;">0</span><span style="color: #ff0000;">]</span> <span style="color: #0000ff;">from</span> pg_partition <span style="color: #0000ff;">where</span> parrelid<span style="color: #808080;">=%</span>s) <span style="color: #808080;">and</span> attrelid<span style="color: #808080;">=%</span>s;"<span style="color: #808080;">%</span><span style="color: #000000;">(table_oid,table_oid); get_parinfo2</span><span style="color: #808080;">=</span>""" <span style="color: #0000ff;">select</span> pp.parrelid,prl.parchildrelid,<span style="color: #ff00ff;">case</span> <span style="color: #0000ff;">when</span> pp.parkind<span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">h</span><span style="color: #ff0000;">'</span>::"<span style="color: #0000ff;">char</span>" <span style="color: #0000ff;">then</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;">hash</span><span style="color: #ff0000;">'</span>::<span style="color: #0000ff;">text</span> <span style="color: #0000ff;">when</span> pp.parkind<span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">r</span><span style="color: #ff0000;">'</span>::"<span style="color: #0000ff;">char</span>" <span style="color: #0000ff;">then</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;">range</span><span style="color: #ff0000;">'</span>::<span style="color: #0000ff;">text</span> <span style="color: #0000ff;">when</span> pp.parkind<span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">l</span><span style="color: #ff0000;">'</span>::"<span style="color: #0000ff;">char</span>" <span style="color: #0000ff;">then</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;">list</span><span style="color: #ff0000;">'</span>::<span style="color: #0000ff;">text</span> <span style="color: #0000ff;">else</span> <span style="color: #0000ff;">null</span>::<span style="color: #0000ff;">text</span> <span style="color: #0000ff;">end</span> <span style="color: #0000ff;">as</span> partitiontype,pg_get_partition_rule_def(prl.oid,true) <span style="color: #0000ff;">as</span> partitionboundary <span style="color: #0000ff;">from</span> pg_partition pp,pg_partition_rule prl <span style="color: #0000ff;">where</span> pp.paristemplate<span style="color: #808080;">=</span>false <span style="color: #808080;">and</span> pp.parrelid <span style="color: #808080;">=</span> <span style="color: #808080;">%</span>s <span style="color: #808080;">and</span> prl.paroid <span style="color: #808080;">=</span> pp.oid <span style="color: #0000ff;">order</span> <span style="color: #0000ff;">by</span> prl.parname; """ <span style="color: #808080;">%</span><span style="color: #000000;"> (table_oid) v_par_parent</span><span style="color: #808080;">=</span>plpy.<span style="color: #0000ff;">execute</span><span style="color: #000000;">(get_parinfo1); v_par_info</span><span style="color: #808080;">=</span>plpy.<span style="color: #0000ff;">execute</span><span style="color: #000000;">(get_parinfo2); max_column_len</span><span style="color: #808080;">=</span><span style="color: #800000; font-weight: bold;">10</span><span style="color: #000000;"> max_type_len</span><span style="color: #808080;">=</span><span style="color: #800000; font-weight: bold;">4</span><span style="color: #000000;"> max_modifiers_len</span><span style="color: #808080;">=</span><span style="color: #800000; font-weight: bold;">4</span><span style="color: #000000;"> max_default_len</span><span style="color: #808080;">=</span><span style="color: #800000; font-weight: bold;">4</span> <span style="color: #0000ff;">for</span> i <span style="color: #808080;">in</span><span style="color: #000000;"> rv_columns: </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'attname'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: </span><span style="color: #0000ff;">if</span> max_column_len <span style="color: #808080;"><</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'attname'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__(): max_column_len</span><span style="color: #808080;">=</span>i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'attname'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__() </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'format_type'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: </span><span style="color: #0000ff;">if</span> max_type_len <span style="color: #808080;"><</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'format_type'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__(): max_type_len</span><span style="color: #808080;">=</span>i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'format_type'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__() </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'default'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: </span><span style="color: #0000ff;">if</span> max_type_len <span style="color: #808080;"><</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'default'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__(): max_default_len</span><span style="color: #808080;">=</span>i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'default'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">.__len__() first</span><span style="color: #808080;">=</span><span style="color: #000000;">True </span><span style="color: #0000ff;">for</span> i <span style="color: #808080;">in</span><span style="color: #000000;"> rv_columns: </span><span style="color: #0000ff;">if</span> first<span style="color: #808080;">==</span><span style="color: #000000;">True: split_char</span><span style="color: #808080;">=</span><span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span><span style="color: #000000;">; first</span><span style="color: #808080;">=</span><span style="color: #000000;">False </span><span style="color: #0000ff;">else</span><span style="color: #000000;">: split_char</span><span style="color: #808080;">=</span><span style="color: #ff0000;">'</span><span style="color: #ff0000;">,</span><span style="color: #ff0000;">'</span><span style="color: #000000;">; </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'attname'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> " " <span style="color: #808080;">+</span> split_char <span style="color: #808080;">+</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'attname'</span><span style="color: #ff0000;">]</span>.ljust(max_column_len<span style="color: #808080;">+</span><span style="color: #800000; font-weight: bold;">6</span>)<span style="color: #808080;">+</span><span style="color: #ff0000;">''</span> <span style="color: #0000ff;">else</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> "" <span style="color: #808080;">+</span> split_char <span style="color: #808080;">+</span> <span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span>.ljust(max_column_len<span style="color: #808080;">+</span><span style="color: #800000; font-weight: bold;">6</span><span style="color: #000000;">) </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'format_type'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> <span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span> <span style="color: #808080;">+</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'format_type'</span><span style="color: #ff0000;">]</span>.ljust(max_type_len <span style="color: #808080;">+</span><span style="color: #800000; font-weight: bold;">2</span><span style="color: #000000;">) </span><span style="color: #0000ff;">else</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> <span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span> <span style="color: #808080;">+</span> <span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span>.ljust(max_type_len<span style="color: #808080;">+</span><span style="color: #800000; font-weight: bold;">2</span><span style="color: #000000;">) </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'isnull'</span><span style="color: #ff0000;">]</span> <span style="color: #808080;">and</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'isnull'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> <span style="color: #ff0000;">'</span> <span style="color: #ff0000;">'</span> <span style="color: #808080;">+</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;"> not null </span><span style="color: #ff0000;">'</span>.ljust(<span style="color: #800000; font-weight: bold;">8</span><span style="color: #000000;">) </span><span style="color: #0000ff;">if</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'default'</span><span style="color: #ff0000;">]</span><span style="color: #000000;">: create_sql </span><span style="color: #808080;">+=</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;"> default </span><span style="color: #ff0000;">'</span> <span style="color: #808080;">+</span> i<span style="color: #ff0000;">[</span><span style="color: #ff0000;">'default'</span><span style="color: #ff0000;">]</span>.ljust(max_default_len<span style="color: #808080;">+</span><span style="color: #800000; font-weight: bold;">6</span><span style="color: #000000;">) create_sql </span><span style="color: #808080;">+=</span><span style="color: #000000;"> "\n" create_sql </span><span style="color: #808080;">+=</span><span style="color: #000000;"> ")" </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> rv_reloptions: create_sql </span><span style="color: #808080;">+=</span>" <span style="color: #0000ff;">with</span> ("<span style="color: #808080;">+</span><span style="color: #ff00ff;">str</span>(rv_reloptions).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">{</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">}</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">[</span><span style="color: #ff0000;">'</span>).strip(<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]</span><span style="color: #ff0000;">'</span>) <span style="color: #808080;">+</span><span style="color: #000000;">")\n" create_sql </span><span style="color: #808080;">=</span> create_sql.<span style="color: #ff00ff;">replace</span>("<span style="color: #ff0000;">'</span><span style="color: #ff0000;">",</span><span style="color: #ff0000;">''</span><span style="color: #ff0000;">) if rv_distribution2: create_sql += </span><span style="color: #ff0000;">'</span><span style="color: #0000ff;">Distributed</span> <span style="color: #0000ff;">by</span> (<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> for i in rv_distribution2: create_sql += i[</span><span style="color: #ff0000;">'</span>attname<span style="color: #ff0000;">'</span><span style="color: #ff0000;">] + </span><span style="color: #ff0000;">'</span>,<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> create_sql =create_sql.strip(</span><span style="color: #ff0000;">'</span>,<span style="color: #ff0000;">'</span><span style="color: #ff0000;">)+</span><span style="color: #ff0000;">'</span>)<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> elif rv_distribution1: create_sql += </span><span style="color: #ff0000;">'</span><span style="color: #0000ff;">Distributed</span> randomly\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> if v_par_parent: partitiontype=v_par_info[0][</span><span style="color: #ff0000;">'</span>partitiontype<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]; create_sql +=</span><span style="color: #ff0000;">'</span>\nPARTITION <span style="color: #0000ff;">BY</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;">+ partitiontype + "("+v_par_parent[0][</span><span style="color: #ff0000;">'</span>columnname<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]+")\n(\n"; for i in v_par_info: create_sql +=" " +i[</span><span style="color: #ff0000;">'</span>partitionboundary<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]+</span><span style="color: #ff0000;">'</span>,\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;">; create_sql=create_sql.strip(</span><span style="color: #ff0000;">'</span>,\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;">); create_sql+="\n)" create_sql+=";\n\n" for i in rv_index: create_sql += i[</span><span style="color: #ff0000;">'</span>indexdef<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]+</span><span style="color: #ff0000;">'</span>;\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> get_table_comment="select </span><span style="color: #ff0000;">'</span>comment <span style="color: #0000ff;">on</span> <span style="color: #808080;">%</span>s <span style="color: #808080;">%</span>s <span style="color: #0000ff;">is</span> <span style="color: #ff0000;">'''</span><span style="color: #ff0000;">|| COALESCE (description,</span><span style="color: #ff0000;">''</span><span style="color: #ff0000;">)|| </span><span style="color: #ff0000;">''''</span><span style="color: #ff0000;"> as comment from pg_description where objoid=%s and objsubid=0;" % (table_kind,tablename,table_oid) get_column_comment="select </span><span style="color: #ff0000;">'</span>comment <span style="color: #0000ff;">on</span> <span style="color: #0000ff;">column</span> <span style="color: #808080;">%</span>s.<span style="color: #ff0000;">'</span><span style="color: #ff0000;">||b.attname ||</span><span style="color: #ff0000;">'</span> <span style="color: #0000ff;">is</span> <span style="color: #ff0000;">'''</span><span style="color: #ff0000;"> || COALESCE(a.description,</span><span style="color: #ff0000;">''</span><span style="color: #ff0000;">)|| </span><span style="color: #ff0000;">'''</span> <span style="color: #ff0000;">'</span><span style="color: #ff0000;"> as comment from pg_catalog.pg_description a,pg_catalog.pg_attribute b where objoid=%s and a.objoid=b.attrelid and a.objsubid=b.attnum;" % (tablename,table_oid) rv_table_comment=plpy.execute(get_table_comment); rv_column_comment=plpy.execute(get_column_comment); for i in rv_table_comment: create_sql += i[</span><span style="color: #ff0000;">'</span>comment<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]+</span><span style="color: #ff0000;">'</span>;\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> for i in rv_column_comment: create_sql +=i[</span><span style="color: #ff0000;">'</span>comment<span style="color: #ff0000;">'</span><span style="color: #ff0000;">]+</span><span style="color: #ff0000;">'</span>;\n<span style="color: #ff0000;">'</span><span style="color: #ff0000;"> return create_sql;
$$ LANGUAGE plpythonu;
3. 进行测试
testdb=# SELECT get_table_structure('public.tb1_partition_range_yyyymmdd'); get_table_structure ------------------------------------------------------------------------------------------------------------------- create table public.tb1_partition_range_yyyymmdd ( id numeric ,yyyymmdd date ) with (appendonly=true, compresslevel=5) Distributed by (id) PARTITION BY range(yyyymmdd) ( PARTITION p20120811 START ('2012-08-11'::date) END ('2012-08-12'::date) WITH (appendonly=true, compresslevel=5), PARTITION p20120812 START ('2012-08-12'::date) END ('2012-08-13'::date) WITH (appendonly=true, compresslevel=5) );
CREATE INDEX idx_yyyymmdd ON tb1_partition_range_yyyymmdd USING btree (yyyymmdd);
(1 row)
参考资料：
《greenplum 企业应用实战》
作者：Atlas
出处：Atlas的博客 http://www.cnblogs.com/gomysql
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