`JdbcAspect.getConnection` will execute `SELECT USER()` every time

I find the getConnection() method is slower than expected. So I check the source code:

  public Object getConnection(final ProceedingJoinPoint pjp) throws Throwable {
    Connection conn = (Connection) pjp.proceed();
    String url = conn.getMetaData().getURL();
    String user = conn.getMetaData().getUserName();
    String dbType;
    boolean withActiveSpanOnly = false;
    try {
      dbType = url.split(":")[1];
    } catch (Throwable t) {
      throw new IllegalArgumentException(
          "Invalid JDBC URL. Expected to find the database type after the first ':'. URL: " + url);
    }
    return new TracingConnection(conn, dbType, user, withActiveSpanOnly);
  }

For this line: String user = conn.getMetaData().getUserName(); mysql-connector-java will execute SELECT USER() every time.

[wuyupengwoaini]

@pavolloffay please help me to review the pr

[wuyupengwoaini]

Ok, i’ll try to fix it within a few days