Python使用graphviz画流程图过程解析

时间：2020-07-27 python教程查看: 1871

问题描述

项目中需要用到流程图，如果用js的echarts处理，不同层级建动态计算位置比较复杂，考虑用python来实现

测试demo

实现效果如下

完整代码

import yaml
import os
import ibm_db
from graphviz import Digraph
from datetime import datetime


# db连接
def db2_query(sql):
  conn = ibm_db.connect(
    "DATABASE=%s;HOSTNAME=%s;PORT=%s;PROTOCOL=TCPIP;UID=%s;PWD=%s" % (
      config['db2_databse'],
      config['db2_host'],
      config['db2_port'],
      config['db2_user'],
      config['db2_password']
    ), "", ""
  )

  if conn:
    # 执行
    stmt = ibm_db.exec_immediate(conn, sql)
    result = ibm_db.fetch_both(stmt)

  return result, stmt, conn


# 添加所有的点
def add_nodes():
  sql = "SELECT * FROM AML.DEP_OFTEN_TRAD WHERE ACCOUNT_NO=" + ACCOUNT_NO + " ORDER BY NUM DESC fetch first 10 rows ONLY;"
  result, stmt, conn = db2_query(sql)
  nodes = []
  nodes_dict = {}
  nodes_dict[ACCOUNT_NO] = 'A'

  count = 0
  while (result):
    count = count + 1
    print(chr(ord('A') + count) + "," + result[3])
    dot.node(chr(ord('A') + count), result[3], shape="rectangle", color="orange")

    nodes.append(result[2])
    nodes_dict[result[2]] = chr(ord('A') + count)
    print('-----------------')
    result = ibm_db.fetch_both(stmt)

  # 关闭数据库连接
  ibm_db.close(conn)
  nodes.append(ACCOUNT_NO)

  return dot, nodes, nodes_dict


# 添加所有的边
def add_edges(nodes):
  nodes_back = nodes
  print(nodes_back)

  for p in range(len(nodes_back)):
    nodes_temp = nodes.copy()
    from_nodes = nodes_temp.pop(p)
    print("len of nodes_temp:" + str(len(nodes_temp)) + ",from_nodes:" + from_nodes)

    nodes_temp_in = ",".join(nodes_temp)
    nodes_temp_in = '(' + nodes_temp_in + ')'

    sql = "SELECT * FROM AML.DEP_OFTEN_TRAD WHERE ACCOUNT_NO=" + from_nodes + " and CNTPRT_ACCOUNT_NO IN" + \
       nodes_temp_in
    result, stmt, conn = db2_query(sql)
    if (result):
      while (result):
        print('-----------------')
        print(result)
        print(result['CNTPRT_ACCOUNT_NO'] + nodes_dict[result['CNTPRT_ACCOUNT_NO']])
        print("add edges," + result['TRAD_VAL'] + " from:" + from_nodes + ",to:" + result['CNTPRT_ACCOUNT_NO'])
        dot.edge(nodes_dict[from_nodes], nodes_dict[result['CNTPRT_ACCOUNT_NO']], result['TRAD_VAL'])
        result = ibm_db.fetch_both(stmt)

      # 关闭数据库连接
      ibm_db.close(conn)
  return dot


if __name__ == "__main__":
  yaml_path = os.path.join('../', 'config.yaml')
  with open(yaml_path, 'r') as f:
    config = yaml.load(f)

  dot = Digraph(
    engine="circo",
    comment='The Test Table',
    format="png"
  )

  ACCOUNT_NO = '10100002181'
  # 添加圆点A,A的标签是Dot A
  dot.node('A', '中心客户', shape="rectangle", color="blue")

  nodes_begin = datetime.now()
  print(str(nodes_begin) + " nodes_begin")

  dot, nodes, nodes_dict = add_nodes()

  print(nodes_dict)
  edges_begin = datetime.now()
  print(str(edges_begin) + " edges_begin")

  dot = add_edges(nodes)

  print(dot.source)
  render_begin = datetime.now()
  print(str(render_begin) + " render_begin")
  dot.render('./file/db2-table.gv', view=True)

测试流程图

用不同的参数，生成的2个图如下

linux环境搭建

线上是不连外网的私有服务器，开始在离线环境安装，需要依赖的包太多，后来就在虚拟机里redhat6.6在线装好了。####redhat安装rpm依赖

#清除原有RHEL的YUM及相关软件包。
rpm -qa | grep yum | xargs rpm -e --nodeps
rpm -qa |grep python-urlgrabber|xargs rpm -e --nodeps

mv CentOS6-Base-163.repo /etc/yum.repos.d/

#安装rpm依赖包

rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
rpm -ivh yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm yum-3.2.29-81.el6.centos.noarch.rpm

替换yum163源

cd /etc/yum.repos.d/mv rhel-source.repo rhel-source.repo.bak

清理yum缓存

yum clean allyum makecache#测试yum repolist

安装graphviz

yum install 'graphviz*'#测试which dot #/usr/bin/dotdot -V#dot - graphviz version 2.26.0 (20091210.2329)

查看yum的安装日志，发现需要依赖2，30个包

解决依赖关系
--> 执行事务检查
---> Package graphviz.x86_64 0:2.26.0-10.el6 will be 安装
--> 处理依赖关系 libgd.so.2()(64bit)，它被软件包 graphviz-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 libXpm.so.4()(64bit)，它被软件包 graphviz-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 libXaw.so.7()(64bit)，它被软件包 graphviz-2.26.0-10.el6.x86_64 需要
---> Package graphviz-devel.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-doc.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-gd.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-graphs.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-guile.x86_64 0:2.26.0-10.el6 will be 安装
--> 处理依赖关系 guile，它被软件包 graphviz-guile-2.26.0-10.el6.x86_64 需要
---> Package graphviz-java.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-lua.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-perl.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-php.x86_64 0:2.26.0-10.el6 will be 安装
--> 处理依赖关系 php(zend-abi) = 20090626，它被软件包 graphviz-php-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 php(api) = 20090626，它被软件包 graphviz-php-2.26.0-10.el6.x86_64 需要
---> Package graphviz-python.x86_64 0:2.26.0-10.el6 will be 安装
---> Package graphviz-ruby.x86_64 0:2.26.0-10.el6 will be 安装
--> 处理依赖关系 ruby，它被软件包 graphviz-ruby-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 libruby.so.1.8()(64bit)，它被软件包 graphviz-ruby-2.26.0-10.el6.x86_64 需要
---> Package graphviz-tcl.x86_64 0:2.26.0-10.el6 will be 安装
--> 处理依赖关系 tcl >= 8.3，它被软件包 graphviz-tcl-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 tk，它被软件包 graphviz-tcl-2.26.0-10.el6.x86_64 需要
--> 处理依赖关系 libtk8.5.so()(64bit)，它被软件包 graphviz-tcl-2.26.0-10.el6.x86_64 需要
--> 执行事务检查
---> Package gd.x86_64 0:2.0.35-11.el6 will be 安装
---> Package guile.x86_64 5:1.8.7-5.el6 will be 安装
---> Package libXaw.x86_64 0:1.0.11-2.el6 will be 安装
---> Package libXpm.x86_64 0:3.5.10-2.el6 will be 安装
---> Package php-common.x86_64 0:5.3.3-49.el6 will be 安装
---> Package ruby.x86_64 0:1.8.7.374-5.el6 will be 安装
---> Package ruby-libs.x86_64 0:1.8.7.374-5.el6 will be 安装
--> 处理依赖关系 libreadline.so.5()(64bit)，它被软件包 ruby-libs-1.8.7.374-5.el6.x86_64 需要
---> Package tcl.x86_64 1:8.5.7-6.el6 will be 安装
---> Package tk.x86_64 1:8.5.7-5.el6 will be 安装
--> 执行事务检查
---> Package compat-readline5.x86_64 0:5.2-17.1.el6 will be 安装
--> 完成依赖关系计算

依赖关系解决

yum安装openssl-devel

#查看openssl安装包rpm -aq|grep opensslyum install openssl-devel -y

查看yum依赖

正在升级 : libcom_err-1.41.12-24.el6.x86_64 1/26
正在升级 : libselinux-2.0.94-7.el6.x86_64 2/26
正在升级 : krb5-libs-1.10.3-65.el6.x86_64 3/26
****************
Verifying : e2fsprogs-libs-1.41.12-21.el6.x86_64 23/26
Verifying : libselinux-2.0.94-5.8.el6.x86_64 24/26
Verifying : krb5-libs-1.10.3-33.el6.x86_64 25/26
Verifying : libss-1.41.12-21.el6.x86_64 26/26

python安装pip依赖

pip install -r requirement.txt

#Installing collected packages: PyYAML, ibm-db, tornado, graphviz
# Running setup.py install for PyYAML ... done
# Running setup.py install for ibm-db ... done
# Running setup.py install for tornado ... done
#Successfully installed PyYAML-5.1.1 graphviz-0.11.1 ibm-db-3.0.1 tornado-6.0.3

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