Erlang 中的 Mysql

Question

我想通过Erlang在Mysql中获取数据，但是我得到的数据输出显示所有col_name并且它没有一一渲染

这是我的输出:

{selected,["id","first_name","last_name"],
                              [{1,"Matt","Williamson"},
                               {2,"Matt","Williamson2"},
                               {3,"Matt","Williamson3"}]}}

我正在使用此代码:

application:start(odbc),
ConnString = "DSN=mysqldb",
{ok, Conn} = odbc:connect(ConnString, []),
Results = odbc:sql_query(Conn, "SELECT * FROM test_table"),
io:format("~p",[Results]).

如何获取不到 {selected, [col_name]}？ 以及如何使用 Erlang 像 php 中的 for 循环一样渲染我得到的数据？

渲染

{1,"Matt","Williamson"}{2,"Matt","Williamson2"}{3,"Matt","Williamson3"} have

我希望它像这样渲染

1 have Matt Williamson
2 have Matt Williamson2
3 have Matt Williamson3

Answer 1

您可以像这样使用模式匹配:

{selected, _Column, Data} = odbc:sql_query(Conn, "SELECT * FROM test_table"),

然后使用io:format("~p",[Data])。

你会得到:

[
 {1,"Matt","Williamson"},
 {2,"Matt","Williamson2"},
 {3,"Matt","Williamson3"}
]