我想知道在 APP ENGINE 中托管我的项目时为什么会抛出此错误,我添加了大量日志记录只是为了分析。当我使用本地 ip 来使用 com.mysql.jdbc.Driver 时,它可以工作。请帮忙!!
String name = "Vinodh";
String url = null;
try {
Class.forName("com.mysql.jdbc.GoogleDriver");
url = "jdbc:google:mysql://xxxxxxx:xxxxxx/vinodh?user=root&password=xxxxxx";
// Statements allow to issue SQL queries to the database
log.info("Initiate Connection");
Connection conn = DriverManager.getConnection(url);
log.info("Got Connection");
Statement statement = conn.createStatement();
// Result set get the result of the SQL query
ResultSet resultSet = statement
.executeQuery("select * from Family");
log.info("Entering While");
while(resultSet.next()){
log.info("Entered While");
String test = resultSet.getString("Name");
System.out.println(test);
name = test+test+test;
}
如本教程所示,在开发过程中,您应该使用普通的 mysql 驱动程序,并且只有 appengine 使用 Google mysql 驱动程序
if (SystemProperty.environment.value() ==
SystemProperty.Environment.Value.Production) {
// Load the class that provides the new "jdbc:google:mysql://" prefix.
Class.forName("com.mysql.jdbc.GoogleDriver");
url = "jdbc:google:mysql://your-project-id:your-instance-name/guestbook?user=root";
} else {
// Local MySQL instance to use during development.
Class.forName("com.mysql.jdbc.Driver");
url = "jdbc:mysql://127.0.0.1:3306/guestbook?user=root";
}
还要仔细检查您是否已为您的应用程序启用 MySQL Connector/J(默认情况下未启用)
https://developers.google.com/appengine/docs/java/cloud-sql/#enable_connector_j
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
...
<use-google-connector-j>true</use-google-connector-j>
</appengine-web-app>
显然他们悄悄地删除了这个。它甚至不再出现在
appengine-web.xml
的文档中。
使用标准
com.mysql.jdbc.Driver
但更新您的 JDBC URL:
jdbc:mysql://google/[your-db-schema]
?user=root
&password=[your-db-passord]
&socketFactory=com.google.cloud.sql.mysql.SocketFactory
&cloudSqlInstance=[your-db-project-id]:[your-db-region]:[your-db-intance]
也添加到你的 gradle 中:
dependencies {
...
implementation("mysql:mysql-connector-java:8.0.29")
implementation("com.google.cloud.sql:mysql-socket-factory-connector-j-8:1.5.0")
}
注意 URI 中的“google”。文档中没有任何地方说您需要它,但您必须这样做。
我的 App Engine Java 11 2023 解决方案
首先添加对gradle的依赖:
implementation('mysql:mysql-connector-java:8.0.33')
implementation('com.google.cloud.sql:mysql-socket-factory-connector-j-8:1.11.0')
然后您可以通过以下方式连接到 Cloud SQL:
Class.forName("com.mysql.cj.jdbc.Driver"); //com.mysql.cj.jdbc.Driver is deprecated
String jdbcUrl = "jdbc:mysql:///<DATABASE_NAME>?"
+ "cloudSqlInstance=<INSTANCE_CONNECTION_NAME>"
+ "&socketFactory=com.google.cloud.sql.mysql.SocketFactory"
+ "&user=<MYSQL_USER_NAME>"
+ "&password=<MYSQL_USER_PASSWORD>";
//now can use your connection string..for example:
DriverManager.getConnection(jdbcUrl, <MYSQL_USER_NAME>, <MYSQL_USER_PASSWORD>)
cloudSqlInstance 是实例连接名称(可在实例详细信息页面找到)。它类似于project_id:cloud_sql_zone:cloud_sql_name