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[英]Mysql connection error for Spring framework (org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; )
[英]Java Spring Error: Could not get JDBC Connection
我正在使用 Spring 框架和 JDBC 做一個小練習,我得到了以下錯誤:
Exception in thread "main" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: No suitable driver found for jdbc:mysql:3306//localhost/springcore
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:573)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:812)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:868)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:876)
at springcore.springcore.EmployeeJDBCTemplate.create(EmployeeJDBCTemplate.java:23)
at springcore.springcore.EmployeeApp.main(EmployeeApp.java:23)
Caused by: java.sql.SQLException: No suitable driver found for jdbc:mysql:3306//localhost/springcore
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
我的 pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>springcore</groupId>
<artifactId>springcore</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springcore</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.0.RELEASE</version>
</dependency>
<!-- MySQL database driver -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>3.2.0.RELEASE</version>
</dependency>
</dependencies>
</project>
和 Beans.xml:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">
<!-- Initialization for data source -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:3306//localhost/springcore"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</bean>
<!-- Definition for employeeJDBCTemplate bean -->
<bean id="employeeJDBCTemplate"
class="springcore.springcore.EmployeeJDBCTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
數據庫:MySQL,我用Xampp和phpmyadmin管理數據庫:IDE,esclipse,Maven項目!
我是不是缺少圖書館之類的?
請告訴我哪里出錯了::D 提前致謝!
您確定連接字符串正確嗎?
默認網址
jdbc:mysql://localhost:3306/dbname
清理並構建您的項目。
Tomcat服務器終端並重新啟動。
正確輸入您的網址。
JDBC_DRIVER = "com.mysql.jdbc.Driver"; DB_URL = "jdbc:mysql://localhost/EMP"; conn = DriverManager.getConnection(DB_URL,USER,PASS);
當我輸入“localhost”時,它不知何故不起作用,但是這個:
jdbc:mysql://127.0.0.1:3306/dbname
似乎對我有用....
驅動class:mysql數據庫的驅動class為com.mysql.jdbc.Driver。 連接URL:mysql數據庫的連接URL為jdbc:mysql://localhost:7101/empDB
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection(
"jdbc:mysql://localhost:7101/empDB","root","root");
//here empDB is database name, root is username and password
其中 jdbc 是 API,mysql 是數據庫,localhost 是運行 mysql 的服務器名稱,我們也可以使用 IP 地址,7101 是端口號,empDB 是數據庫名稱。 我們可以使用任何數據庫,在這種情況下,我們需要用我們的數據庫名稱替換 empDB。
MySQL 連接器數據庫 URL 以下是 MySQL 連接器的數據庫連接 URL 語法:
jdbc:mysql://[host][,failoverhost...]
[:port]/[database]
[?propertyName1][=propertyValue1]
[&propertyName2][=propertyValue2].
https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-jdbc-url-format.html
https://docs.oracle.com/javase/tutorial/jdbc/basics/connecting.html
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