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JDBC 获取 Oracle 数据库连接(使用 Driver)(jdbc获取oracle表结构)

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对于JDBC获取Oracle数据库连接感兴趣的读者,本文将会是一篇不错的选择,我们将详细介绍使用Driver,并为您提供关于2.通过原始的Driver接口通过读取Properties属性文件获取JDB

对于JDBC 获取 Oracle 数据库连接感兴趣的读者,本文将会是一篇不错的选择,我们将详细介绍使用 Driver,并为您提供关于2. 通过原始的 Driver 接口通过读取 Properties 属性文件获取 JDBC 数据库连接 Connection、Caused by: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jd、ClassCastException:无法将oracle.jdbc.driver.T4CConnection强制转换为oracle.jdbc.OracleConnection、com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver的有用信息。

本文目录一览:

JDBC 获取 Oracle 数据库连接(使用 Driver)(jdbc获取oracle表结构)

JDBC 获取 Oracle 数据库连接(使用 Driver)(jdbc获取oracle表结构)

获取数据库连接的方法:

1. Driver 接口:

Java.sql.Driver 接口是所有 JDBC 驱动程序需要实现的接口。这个接口是提供给数据库厂商使用的,不同数据库厂商提供不同的实现

在程序中不需要直接去访问实现了 Driver 接口的类,而是由驱动程序管理器类(java.sql.DriverManager)去调用这些Driver实现

2. 加载与注册JDBC 驱动:

加载 JDBC 驱动需调用 Class 类的静态方法 forName(),向其传递要加载的 JDBC 驱动的类名

DriverManager 类是驱动程序管理器类,负责管理驱动程序

通常不用显式调用 DriverManager 类的 registerDriver() 方法来注册驱动程序类的实例,因为 Driver 接口的驱动程序类都包含了静态代码块,在这个静态代码块中,会调用 DriverManager.registerDriver() 方法来注册自身的一个实例

3. 建立连接: 

可以调用 DriverManager 类的 getConnection() 方法建立到数据库的连接

JDBC URL 用于标识一个被注册的驱动程序,驱动程序管理器通过这个 URL 选择正确的驱动程序,从而建立到数据库的连接。

JDBC URL的标准由三部分组成,各部分间用冒号分隔。

jdbc:<子协议>:<子名称>

协议:JDBC URL中的协议总是jdbc

子协议:子协议用于标识一个数据库驱动程序

子名称:一种标识数据库的方法。子名称可以依不同的子协议而变化,用子名称的目的是为了定位数据库提供足够的信息

 

public Connection getConnection() throws Exception{
  String driverClass = null;
  String jdbcUrl = null;
  String user = null;
  String password = null;
  
  InputStream in =
    getClass().getClassLoader().getResourceAsStream("jdbc.properties");
  Properties properties = new Properties();
  properties.load(in);
  driverClass = properties.getProperty("driver");
  jdbcUrl = properties.getProperty("jdbcUrl");
  user = properties.getProperty("user");
  password = properties.getProperty("password");
  
  // 通过反射创建 Driver 对象
  Driver driver =
    (Driver) Class.forName(driverClass).newInstance();
  
  Properties info = new Properties();
  info.put("user", user);
  info.put("password", password);

// 通过 Driver 的connect 方法获取数据库连接
  Connection connection = driver.connect(jdbcUrl, info);
  
  return connection;
 }
 
 
@Test
 public void testGetConnection() throws Exception{
  System.out.println(getConnection());
 }

 

//  jdbc.properties 文件

driver=oracle.jdbc.driver.OracleDriver
jdbcUrl=jdbc:oracle:thin:
@localhost :1521:orcl
user=scott
password=tiger

2. 通过原始的 Driver 接口通过读取 Properties 属性文件获取 JDBC 数据库连接 Connection

2. 通过原始的 Driver 接口通过读取 Properties 属性文件获取 JDBC 数据库连接 Connection

/**
	 * 编写一个通用的方法, 在不修改源程序的情况下, 可以获取任何数据库的连接
	 * 解决方案: 把数据库驱动 Driver 实现类的全类名、url、user、password 放入一个
	 * 配置文件中, 通过修改配置文件的方式实现和具体的数据库解耦. 
	 * @throws Exception 
	 */
	public Connection getConnection() throws Exception{
		String driverClass = null;
		String jdbcUrl = null;
		String user = null;
		String password = null;
		
		//读取类路径下的 jdbc.properties 文件
		InputStream in = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
		Properties properties = new Properties();
		properties.load(in);
		driverClass = properties.getProperty("driver");
		jdbcUrl = properties.getProperty("jdbcUrl");
		user = properties.getProperty("user");
		password = properties.getProperty("password");
		
		//通过反射常见 Driver 对象. 
		Driver driver = 
				(Driver) Class.forName(driverClass).newInstance();
		
		Properties info = new Properties();
		info.put("user", user);
		info.put("password", password);
		
		//通过 Driver 的 connect 方法获取数据库连接. 
		Connection connection = driver.connect(jdbcUrl, info);
		
		return connection;
	}




Caused by: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jd

Caused by: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jd

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jdbc:mysql//localhost:3306/cache
### The error may exist in com/pshdhx/cache/mapper/Employeemapper.java (best guess)
### The error may involve com.pshdhx.cache.mapper.Employeemapper.getEmployee
### The error occurred while executing a query
### Cause: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jdbc:mysql//localhost:3306/cache




    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:96)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:441)
    at com.sun.proxy.$Proxy73.selectOne(Unknown Source)
    at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:160)
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:87)
    at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)
    at com.sun.proxy.$Proxy79.getEmployee(Unknown Source)






springboot连接mysql查询,是字段没有对应上出的错,一开始我是以为连接mysql出了问题;

ClassCastException:无法将oracle.jdbc.driver.T4CConnection强制转换为oracle.jdbc.OracleConnection

ClassCastException:无法将oracle.jdbc.driver.T4CConnection强制转换为oracle.jdbc.OracleConnection

如何解决ClassCastException:无法将oracle.jdbc.driver.T4CConnection强制转换为oracle.jdbc.OracleConnection

当我尝试与Oracle数据库建立连接时,我遇到了这个问题。我的应用程序规格是java8 + ejb + jboss-eap-7.3 + oracle 12c

请在下面找到我的代码详细信息

我的pom.xml

    <dependency>
         <groupId>ojdbc</groupId>
         <artifactId>ojdbc</artifactId>
         <version>14</version>
         <type>ejb</type>
         <scope>provided</scope> 
    <dependency>
    

我已从路径jboss-ep-7.3/modules/com/oracle/ojdbc/main在module.xml文件中添加了“ ojdbc6.jar”。

    My DBConnection.java

    CallableStatement statement;
    Connection connection;
    ArrayDescriptor descriptor;
    Connection conn = datasourceObj.getconnection(dev);
    try {
        statement = conn.prepareCall(callString);
        connection = ((WrappedConnection) 
      conn).getUnderlyingConnection();
        descriptor = ArrayDescriptor.createDescriptor("NUM_ARRAY",connection);
    }

将此EAR部署到jboss 7.3中之后,出现以下错误

由于:java.lang.classCastException: 无法强制转换org.jboss.jca.adapters.jdbc.jdk8.WrappedConnectionJDK8 到oracle.jdbc.OracleConnection

我替换下面的代码

connection = ((WrappedConnection) conn).getUnderlyingConnection();
        

使用这段代码

OracleConnection oracleConnection = (OracleConnection) conn.getClass().getmethod("getUnderlyingConnection").invoke(conn);
    

此代码更改后得到

ClassCastException:oracle.jdbc.driver.T4CConnection无法强制转换为 oracle.jdbc.OracleConnection

我什至删除了classes12.jar,但没有任何进展。我需要对oracle19c做同样的事情。请给出您的宝贵意见以解决此问题。

com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver

com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver

com.mysql.jdbc.Driver tocom.mysql.cj.jdbc.Driver

MySQL :: MySQL Connector/J 8.0 Developer Guide :: 4.3.1.3 Changes in the Connector/J API https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-api-changes.html

MySQL Connector/J 8.0 Developer Guide  /   ...  /  Changes in the Connector/J API

4.3.1.3 Changes in the Connector/J API

This section describes the changes to the Connector/J API going from version 5.1 to 8.0. You might need to adjust your API calls accordingly:

  • The name of the class that implements java.sql.Driver in MySQL Connector/J has changed from com.mysql.jdbc.Driver tocom.mysql.cj.jdbc.Driver. The old class name has been deprecated.

  • The names of these commonly-used interfaces have also been changed:

    • ExceptionInterceptor: from com.mysql.jdbc.ExceptionInterceptor to com.mysql.cj.exceptions.ExceptionInterceptor

    • StatementInterceptor: from com.mysql.jdbc.StatementInterceptorV2 to com.mysql.cj.interceptors.QueryInterceptor

    • ConnectionLifecycleInterceptor: from com.mysql.jdbc.ConnectionLifecycleInterceptor tocom.mysql.cj.jdbc.interceptors.ConnectionLifecycleInterceptor

    • AuthenticationPlugin: from com.mysql.jdbc.AuthenticationPlugin to com.mysql.cj.protocol.AuthenticationPlugin

    • BalanceStrategy: from com.mysql.jdbc.BalanceStrategy to com.mysql.cj.jdbc.ha.BalanceStrategy.

    •  

     

信息: Loading XML bean definitions from class path resource [Beans.xml]
Loading class `com.mysql.jdbc.Driver''. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver''. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

<?xml version="1.0" encoding="UTF-8"?>
<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 ">

    <bean id="dataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://rm-2zeo.mysql.rds.aliyuncs.com:3306/vtest"/>
        <property name="username" value="u"/>
        <property name="password" value="I"/>
    </bean>

    <!-- Definition for studentJDBCTemplate bean -->
    <bean id="studentJDBCTemplate">
        <property name="dataSource"  ref="dataSource" />
    </bean>

</beans>

  

 mvn clean;mvn compile;mvn package;mvn install;

mvn 打包jar

<?xml version="1.0" encoding="UTF-8"?>
<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>com.tutorialspoint</groupId>
    <artifactId>HelloSpringJDBCMysql</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>

        <!-- Spring Core -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

        <!-- Spring Context -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.3.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>

    </dependencies>
    <build>
        <!--使用的插件列表-->
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <archive>
                        <manifest>
                            <mainClass>com.tutorialspoint.MainApp</mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <useUniqueVersions>false</useUniqueVersions>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>com.tutorialspoint.MainApp</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

  

[root@d java]# tree -I target
.
├── pom.xml
├── spring.iml
└── src
├── main
│   ├── java
│   │   └── com
│   │   └── tutorialspoint
│   │   ├── MainApp.java
│   │   ├── StudentDAO.java
│   │   ├── Student.java
│   │   ├── StudentJDBCTemplate.java
│   │   └── StudentMapper.java
│   └── resources
│   └── beans.xml
└── test
└── java

8 directories, 8 files
[root@d java]#

com.tutorialspoint.StudentDAO

package com.tutorialspoint;
import java.util.List;
import javax.sql.DataSource;
public interface StudentDAO {
/**
* This is the method to be used to initialize
* database resources ie. connection.
*/
public void setDataSource(DataSource ds);
/**
* This is the method to be used to create
* a record in the Student table.
*/
public void create(String name, Integer age);
/**
* This is the method to be used to list down
* a record from the Student table corresponding
* to a passed student id.
*/
public Student getStudent(Integer id);
/**
* This is the method to be used to list down
* all the records from the Student table.
*/
public List<Student> listStudents();
/**
* This is the method to be used to delete
* a record from the Student table corresponding
* to a passed student id.
*/
public void delete(Integer id);
/**
* This is the method to be used to update
* a record into the Student table.
*/
public void update(Integer id, Integer age);
}

com.tutorialspoint.Student

package com.tutorialspoint;
public class Student {
/**
CREATE TABLE Student(
ID INT NOT NULL AUTO_INCREMENT,
NAME VARCHAR(20) NOT NULL,
AGE INT NOT NULL,
PRIMARY KEY (ID)
);
* */
private Integer age;
private String name;
private Integer id;
public void setAge(Integer age) {
this.age = age;
}
public Integer getAge() {
return age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getId() {
return id;
}
}

com.tutorialspoint.StudentMapper

package com.tutorialspoint;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class StudentMapper implements RowMapper<Student> {
public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
Student student = new Student();
student.setId(rs.getInt("id"));
student.setName(rs.getString("name"));
student.setAge(rs.getInt("age"));
return student;
}
}

com.tutorialspoint.StudentJDBCTemplate

package com.tutorialspoint;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
public class StudentJDBCTemplate implements StudentDAO {
private DataSource dataSource;
private JdbcTemplate jdbcTemplateObject;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
}
public void create(String name, Integer age) {
String SQL = "insert into Student (name, age) values (?, ?)";
jdbcTemplateObject.update( SQL, name, age);
System.out.println("Created Record Name = " + name + " Age = " + age);
return;
}
public Student getStudent(Integer id) {
String SQL = "select * from Student where id = ?";
Student student = jdbcTemplateObject.queryForObject(SQL,
new Object[]{id}, new StudentMapper());
return student;
}
public List<Student> listStudents() {
String SQL = "select * from Student";
List <Student> students = jdbcTemplateObject.query(SQL,
new StudentMapper());
return students;
}
public void delete(Integer id){
String SQL = "delete from Student where id = ?";
jdbcTemplateObject.update(SQL, id);
System.out.println("Deleted Record with ID = " + id );
return;
}
public void update(Integer id, Integer age){
String SQL = "update Student set age = ? where id = ?";
jdbcTemplateObject.update(SQL, age, id);
System.out.println("Updated Record with ID = " + id );
return;
}
}

com.tutorialspoint.MainApp

package com.tutorialspoint;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
//ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
//ApplicationContext context = new ClassPathXmlApplicationContext("/data/gateway/java/src/main/resources/beans.xml");
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
StudentJDBCTemplate studentJDBCTemplate =
(StudentJDBCTemplate)context.getBean("studentJDBCTemplate");
System.out.println("------Records Creation--------" );
studentJDBCTemplate.create("Zara", 11);
studentJDBCTemplate.create("Nuha", 2);
studentJDBCTemplate.create("Ayan", 15);
System.out.println("------Listing Multiple Records--------" );
List<Student> students = studentJDBCTemplate.listStudents();
for (Student record : students) {
System.out.print("ID : " + record.getId() );
System.out.print(", Name : " + record.getName() );
System.out.println(", Age : " + record.getAge());
}
System.out.println("----Updating Record with ID = 2 -----" );
studentJDBCTemplate.update(2, 20);
System.out.println("----Listing Record with ID = 2 -----" );
Student student = studentJDBCTemplate.getStudent(2);
System.out.print("ID : " + student.getId() );
System.out.print(", Name : " + student.getName() );
System.out.println(", Age : " + student.getAge());
}
}

 

 

[root@d java]# java -jar /data/gateway/java/target/HelloSpringJDBCMysql-0.0.1-SNAPSHOT-jar-with-dependencies.jar
Dec 03, 2018 3:11:06 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@133314b: startup date [Mon Dec 03 15:11:06 CST 2018]; root of context hierarchy
Dec 03, 2018 3:11:06 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [beans.xml]
------Records Creation--------
Created Record Name = Zara Age = 11
Created Record Name = Nuha Age = 2
Created Record Name = Ayan Age = 15
------Listing Multiple Records--------
ID : 1, Name : Zara, Age : 11
ID : 2, Name : Nuha, Age : 2
ID : 3, Name : Ayan, Age : 15
----Updating Record with ID = 2 -----
Updated Record with ID = 2
----Listing Record with ID = 2 -----
ID : 2, Name : Nuha, Age : 20
[root@d java]#

  

 

 

 

今天关于JDBC 获取 Oracle 数据库连接使用 Driver的介绍到此结束,谢谢您的阅读,有关2. 通过原始的 Driver 接口通过读取 Properties 属性文件获取 JDBC 数据库连接 Connection、Caused by: java.lang.RuntimeException: Driver com.mysql.jdbc.Driver claims to not accept jdbcUrl, jd、ClassCastException:无法将oracle.jdbc.driver.T4CConnection强制转换为oracle.jdbc.OracleConnection、com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver等更多相关知识的信息可以在本站进行查询。

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