Java中如何获得与数据库的最大并发连接？
package org.nhooo.example.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
public class MaxConcurrentConnection {
private static final String URL = "jdbc:mysql://localhost/nhooo";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
try (Connection connection =
DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
DatabaseMetaData metadata = connection.getMetaData();
//获取最大并发连接数的信息
//数据库。可能的最大活动连接数
//一次零的结果表示没有限制
//或限制未知。
int maxConnection = metadata.getMaxConnections();
System.out.println("Maximum Connection = " + maxConnection);
} catch (SQLException e) {
e.printStackTrace();
}
}
}上面的代码片段的结果：
Maximum Connection = 0
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>