本文汇总了常见的Java JDBC关系型数据库连接字符串，包括MySQL，Postgres，SQL Server和DB2。

Database	URL (JDBC Connection String)	JDBC Driver
MySQL	jdbc:mysql://HOST/DATABASE	com.mysql.jdbc.Driver
Postgresql	jdbc:postgresql://HOST/DATABASE	org.postgresql.Driver
SQL Server	jdbc:microsoft:sqlserver://HOST:1433;DatabaseName=DATABASE	com.microsoft.jdbc.sqlserver.SQLServerDriver
DB2	jdbc:as400://HOST/DATABASE;	com.ibm.as400.access.AS400JDBCDriver

MySQL JDBC 使用示例 (JDBC URL)

Here's a sample MySQL JDBC connection string and JDBC driver string, taken from a Java properties file:

如下是在java的properties文件中配置mysql的jdbc连接字符串的示例：

db_url      = jdbc:mysql://HOST/DATABASE
db_driver   = com.mysql.jdbc.Driver
db_username = USERNAME
db_password = PASSWORD

下面是一个java连接MYSQL 执行查询的代码示例：

try
{
  Class.forName("com.mysql.jdbc.Driver").newInstance();
  String url = "jdbc:mysql://HOST/DATABASE";
  conn = DriverManager.getConnection(url, "username", "password");
  doTests();
  conn.close();
}
catch (ClassNotFoundException ex) {System.err.println(ex.getMessage());}
catch (IllegalAccessException ex) {System.err.println(ex.getMessage());}
catch (InstantiationException ex) {System.err.println(ex.getMessage());}
catch (SQLException ex)           {System.err.println(ex.getMessage());}

如果你的mysql数据库监听的端口不是标准的3306，那么需要在连接字符串中指定端口号，如下使用了3336端口的示例：

db_url      = jdbc:mysql://HOST:3336/DATABASE
db_driver   = com.mysql.jdbc.Driver
db_username = USERNAME
db_password = PASSWORD

Postgresql JDBC 连接字符串示例

下面是一个Postgresql jdbc连接字符串的properties文件的示例：

db_url      = jdbc:postgresql://HOST/DATABASE
db_driver   = org.postgresql.Driver
db_username = USERNAME
db_password = PASSWORD

下面是java连接Postgresql的例子：

Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql://HOST/DATABASE";
Connection conn = DriverManager.getConnection(url,"username", "password");

SQL Server JDBC连接字符串示例

如下java properties文件；

db_url      = jdbc:microsoft:sqlserver://HOST:1433;DatabaseName=DATABASE
db_driver   = com.microsoft.jdbc.sqlserver.SQLServerDriver
db_username = USERNAME
db_password = PASSWORD

DB2 on an As/400 (iSeries) jdbc 连接示例

下面是jdbc连接db2数据库的示例，使用spring 配置文件配置。

<bean id="as400DataSource" class="org.apache.commons.dbcp.BasicDataSource">
  <property name="driverClassName" value="com.ibm.as400.access.AS400JDBCDriver" />
  <property name="url" value="jdbc:as400://HOST/DATABASE;" />
  <property name="username" value="USERNAME" />
  <property name="password" value="PASSWORD" />
</bean>

当然你也可以在java properties文件中配置：

db_url      = jdbc:as400://HOST/DATABASE;
db_driver   = com.ibm.as400.access.AS400JDBCDriver
db_username = USERNAME
db_password = PASSWORD