通过 Java 使用 Python 连接 BigSQL

Question

我正在尝试将 python 连接到 BigSQL。我有一个 java 代码可以将 python 连接到 BigSQL 并从 BigSQL 检索数据。下面是我的示例代码

 public class Hello {

  public static void main(String[] args) {
    try(Connection con = DriverManager.getConnection("connection details")) {

Class.forName("com.ibm.db2.jcc.DB2Driver");
    Statement stmt = con.createStatement();
    System.out.println("Connected to BigSQL");      
    ResultSet result = stmt.executeQuery("select *  from table limit 10");
    while (result.next()) {
      //Retrieve by com_name
      String com_name = result.getString(1);
      //Retrieve by family
      String family = result.getString(2); 
      //Retrieve by sci_name
      String sci_name = result.getString(3);
      //Retrieve by symbol
      String symbol = result.getString(4);
      //Retrieve by synonym
      String synonym = result.getString(5);
     System.out.println(com_name+":"+family+":"+sci_name+":"+symbol+":"+synonym);
    }

    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } 
  }

}  

我编写了一个 python 代码来使用我的 python 调用这个 java 代码

import os
import os.path,subprocess
from subprocess import STDOUT,PIPE
path='Location where my .java file is'
os.chdir(path)
def compile_java(java_file):
    subprocess.check_call(['javac', java_file])


def execute_java(java_file):
    java_class,ext = os.path.splitext(java_file)
    cmd = ['java', java_class]

compile_java('Hello.java')      
execute_java("Hello")

我的 python 代码运行成功，但我无法检索

中提到的 java 输出

System.out.println(com_name+":"+family+":"+sci_name+":"+symbol+":"+synonym);

你能帮帮我吗？

提前致谢

Answer 1

您需要执行对 java 的调用并使用check_output 来获取 java 输出。 check_call 只是返回返回码：

def execute_java(java_file):
    java_class,ext = os.path.splitext(java_file)
    cmd = ['java', java_class]
    print(cmd)
    javaStdout =subprocess.check_output(['java', java_class])
    print ('>>', javaStdout)

execute_java("HelloWorld")

回报：

['java', 'HelloWorld']
>> b'Hello World!\n'