Java - MySQL-StoredProcedure 未执行

Question

我从我的 java 类中调用了一些存储过程。这些存储过程中只有一个似乎没有被调用，但没有抛出异常。存储过程如下所示:

CREATE PROCEDURE `insertLoggingMessage` (IN userName VARCHAR(50), IN softwareId   VARCHAR(100), IN operationName VARCHAR(100), IN msg VARCHAR(1000), IN lvl VARCHAR(10))

BEGIN
    SELECT id INTO @userId FROM benutzer WHERE name = userName;
    INSERT INTO logging (benutzer_id, software_id, operation_name, message, level)
    VALUES (@userId, softwareId, operationName, msg, lvl);
END

运行查询的 java 代码如下所示:

private void logToDatabase(Authentication auth, String operationName, String message, LoggingLevel level) {
  String software = getSoftwareId(auth);
  String query = "CALL insertLoggingMessage(?, ?, ?, ?, ?)";
  try {
    connect(this.dataSource);
    CallableStatement statement = this.conn.prepareCall(query);
    statement.setString(1, auth.getUserName());
    setNullableStringParameter(statement, software, 2);
    statement.setString(3, operationName);
    setNullableStringParameter(statement, message, 4);
    statement.setString(5, level.name());
    statement.execute();
    disconnect();
  } catch (Exception exc) {
    logToFile(auth, "logToDatabase", exc, level);
  }
}

代码执行无异常。当我通过 HeidiSQL 调用存储过程时，它工作正常。那么为什么存储过程没有通过 CallableStatement 执行呢？我现在真的很绝望。

Answer 1

我找到了解决方法。在通过 select 语句设置值之前，我在存储过程中声明了变量。这行得通。

DECLARE userId INT(10);
SELECT id INTO userId FROM benutzer WHERE name = userName;
INSERT INTO logging (benutzer_id, software_id, operation_name, message, level)
VALUES (userId, softwareId, operationName, msg, lvl);