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Java 连接 OceanBase 示例
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=========================================
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1. 添加 Maven 依赖
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```javascript
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<dependency>
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<groupId>com.alipay.oceanbase</groupId>
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<artifactId>oceanbase-client</artifactId>
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<version>1.1.5</version>
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</dependency>
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```
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**说明**
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如果需要下载 oceanbase-client,请点击:[oceanbase-client](https://oceanbase-aliyun-docs.oss-cn-hangzhou.aliyuncs.com/downloads/obclient/oceanbase-client-1.1.5.jar)。
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<!-- -->
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2. 修改连接字符串
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连接串的前缀需要设置为 jdbc:oceanbase ,其他部分的使用方式与原生的 MySQL 使用方式保持一致。
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```javascript
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String url = "jdbc:oceanbase://192.168.1.101/TPCC?useUnicode=true&characterEncoding=utf-8";
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String username = "TPCC@obbmsql#obdemo";
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String password = "123456";
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Connection conn = null;
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try {
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Class.forName("com.alipay.oceanbase.obproxy.mysql.jdbc.Driver");
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conn = DriverManager.getConnection(url, username, password);
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PreparedStatement ps = conn.prepareStatement("select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual;");
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ResultSet rs = ps.executeQuery();
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rs.next();
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System.out.println("sysdate is:" + rs.getString(1));
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rs.close();
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ps.close();
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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if (null != conn) {
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conn.close();
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}
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}
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```
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**注意**
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* 目前驱动与服务端交互使用的是文本写协议部分,为了兼容 Oracle 文本协议的 SQL 语法,驱动在PreparedStatement 的 setTimestamp() 类型中都会在前面增加 timestamp 的字面量,因此针对 PreparedStatement 模式下,timestamp 参数不支持字面量。
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* ServerPreparedStatement 支持还不完善,因此请不要设置 useServerPrepStmts 和 cachePrepStmts 参数。
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* 对于 Druid 框架,推荐使用 Druid 最新版 1.2.3:https://github.com/alibaba/druid/releases。
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