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Java调用 Oracle 函数

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Release: 2016-06-07 17:33:41
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Java调用 Oracle 函数,一个函数本质上一个返回一个结果的存储过程,这个例子示范了怎么调用有in、out和in/out参数的函数。

Java调用 Oracle 函数,一个函数本质上一个返回一个结果的存储过程,这个例子示范了怎么调用有in、out和in/out参数的函数。

大同小异的方法。

  CallableStatement cs;
  try {
  // 调用一个没有参数的函数; 函数返回 a VARCHAR
  // 预处理callable语句
  
  cs = connection.prepareCall("{? = call myfunc}");
  
  // 注册返回值类型
  cs.registerOutParameter(1, i);
  
  // Execute and retrieve the returned value
  cs.execute();
  String retValue = cs.getString(1);
  
  // 调用有一个in参数的函数; the function returns a VARCHAR
  cs = connection.prepareCall("{? = call myfuncin(?)}");
  
  // Register the type of the return value
  cs.registerOutParameter(1, Types.VARCHAR);
  
  // Set the value for the IN parameter
  cs.setString(2, "a string");
  
  // Execute and retrieve the returned value
  cs.execute();
  retValue = cs.getString(1);
  
  // 调用有一个out参数的函数; the function returns a VARCHAR
  cs = connection.prepareCall("{? = call myfuncout(?)}");
  
  // Register the types of the return value and OUT parameter
  cs.registerOutParameter(1, Types.VARCHAR);
  cs.registerOutParameter(2, Types.VARCHAR);
  
  // Execute and retrieve the returned values
  cs.execute();
  retValue = cs.getString(1);      // return value
  String outParam = cs.getString(2);  // OUT parameter
  
  // 调用有一个in/out参数的函数; the function returns a VARCHAR
  cs = connection.prepareCall("{? = call myfuncinout(?)}");
  
  // Register the types of the return value and OUT parameter
  cs.registerOutParameter(1, Types.VARCHAR);
  cs.registerOutParameter(2, Types.VARCHAR);
  
  // Set the value for the IN/OUT parameter
  cs.setString(2, "a string");
  
  // Execute and retrieve the returned values
  cs.execute();
  retValue = cs.getString(1);      // return value
  outParam = cs.getString(2);      // IN/OUT parameter
  } catch (SQLException e) {
  }

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