239 lines
6.9 KiB
Markdown
239 lines
6.9 KiB
Markdown
# Spring 整合 Jdbc Template（注解方式）
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<nav>
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<a href="#一项目说明">一、项目说明</a><br/>
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<a href="#11-项目结构">1.1 项目结构</a><br/>
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<a href="#12--项目依赖">1.2 项目依赖</a><br/>
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<a href="#二整合-JDBC-Template">二、整合 JDBC Template</a><br/>
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<a href="#21-数据库配置">2.1 数据库配置</a><br/>
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<a href="#22-配置数据源">2.2 配置数据源</a><br/>
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<a href="#23-数据查询">2.3 数据查询</a><br/>
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<a href="#24-测试查询">2.4 测试查询</a><br/>
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</nav>
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## 一、项目说明
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### 1.1 项目结构
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1. 数据源配置位于 config 目录下的 DatabaseConfig 和 DataSourceConfig；
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2. 项目以单元测试的方法进行测试。
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<div align="center"> <img src="https://gitee.com/heibaiying/spring-samples-for-all/raw/master/pictures/spring-jdbc-annotation.png"/> </div>
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### 1.2 项目依赖
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```xml
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<!--jdbc 相关依赖包-->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-jdbc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.13</version>
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</dependency>
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<dependency>
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<groupId>com.oracle</groupId>
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<artifactId>ojdbc6</artifactId>
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<version>11.2.0.3.0</version>
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</dependency>
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</dependencies>
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```
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## 二、整合 JDBC Template
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### 2.1 数据库配置
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在 resources 文件夹下新建数据库配置文件 mysql.properties、oracle.properties 及其映射的实体类：
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```properties
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# mysql 数据库配置
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mysql.driverClassName=com.mysql.jdbc.Driver
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mysql.url=jdbc:mysql://localhost:3306/mysql
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mysql.username=root
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mysql.password=root
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```
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```properties
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# oracle 数据库配置
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oracle.driverClassName=oracle.jdbc.driver.OracleDriver
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oracle.url=jdbc:oracle:thin:@//IP 地址:端口号/数据库实例名
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oracle.username=用户名
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oracle.password=密码
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```
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```java
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@Configuration
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@PropertySource(value = "classpath:mysql.properties")
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@Data
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public class DataSourceConfig {
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@Value("${mysql.driverClassName}")
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private String driverClassName;
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@Value("${mysql.url}")
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private String url;
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@Value("${mysql.username}")
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private String username;
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@Value("${mysql.password}")
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private String password;
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}
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```
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### 2.2 配置数据源
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基于注解方式配置数据源：
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```java
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@Configuration
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@EnableTransactionManagement // 开启声明式事务处理 等价于 xml 中<tx:annotation-driven/>
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@ComponentScan(basePackages = {"com.heibaiying.*"})
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public class DatabaseConfig {
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/**
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* 配置数据源
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*/
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@Bean
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public DriverManagerDataSource dataSource(DataSourceConfig sourceConfig) {
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DriverManagerDataSource dataSource = new DriverManagerDataSource();
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dataSource.setDriverClassName(sourceConfig.getDriverClassName());
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dataSource.setUrl(sourceConfig.getUrl());
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dataSource.setUsername(sourceConfig.getUsername());
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dataSource.setPassword(sourceConfig.getPassword());
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return dataSource;
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}
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/**
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* 配置 jdbcTemplate
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* @param dataSource 这个参数的名称需要保持和上面方法名一致 才能自动注入,因为
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* 采用@Bean 注解生成的 bean 默认采用方法名为名称，当然也可以在使用@Bean 时指定 name 属性
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*/
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@Bean
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public JdbcTemplate jdbcTemplate(DriverManagerDataSource dataSource) {
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JdbcTemplate jdbcTemplate = new JdbcTemplate();
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jdbcTemplate.setDataSource(dataSource);
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return jdbcTemplate;
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}
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/**
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* 定义事务管理器
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*/
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@Bean
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public DataSourceTransactionManager transactionManager(DriverManagerDataSource dataSource) {
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DataSourceTransactionManager manager = new DataSourceTransactionManager();
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manager.setDataSource(dataSource);
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return manager;
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}
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}
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```
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### 2.3 数据查询
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新建查询接口及其实现类，以下示例分别查询的是 MySQL 和 Oracle 中的字典表：
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```java
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@Repository
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public class MysqlDaoImpl implements MysqlDao {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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/**
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* 更多 JDBC 的使用可以参考官方文档
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* @see <a href="https://docs.spring.io/spring/docs/5.1.3.RELEASE/spring-framework-reference/data-access.html#jdbc-JdbcTemplate">JdbcTemplate</a>
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*/
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public List<Relation> get() {
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List<Relation> relations = jdbcTemplate.query("select * from help_keyword where help_keyword_id = ? ", new Object[]{691},
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new RowMapper<Relation>() {
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public Relation mapRow(ResultSet rs, int rowNum) throws SQLException {
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Relation relation = new Relation();
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relation.setId(rs.getString("help_keyword_id"));
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relation.setName(rs.getString("name"));
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return relation;
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}
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});
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return relations;
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}
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}
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```
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```java
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@Repository
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public class OracleDaoImpl implements OracleDao {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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public List<Flow> get() {
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List<Flow> flows = jdbcTemplate.query("select * from APEX_030200.WWV_FLOW_CALS where ID = ? ", new Object[]{217584603977429772L},
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new RowMapper<Flow>() {
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public Flow mapRow(ResultSet rs, int rowNum) throws SQLException {
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Flow flow = new Flow();
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flow.setId(rs.getLong("ID"));
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flow.setFlowId(rs.getLong("FLOW_ID"));
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flow.setPlugId(rs.getLong("PLUG_ID"));
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return flow;
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}
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});
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return flows;
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}
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}
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```
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### 2.4 测试查询
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新建测试类进行测试：
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration(classes = {ServletConfig.class})
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public class MysqlDaoTest {
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@Autowired
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private MysqlDao mysqlDao;
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@Test
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public void get() {
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List<Relation> relations = mysqlDao.get();
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if (relations != null) {
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for (Relation relation : relations) {
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System.out.println(relation.getId() + " " + relation.getName());
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}
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}
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}
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}
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```
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration(classes = {ServletConfig.class})
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public class OracleDaoTest {
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/*注入接口时: 如果接口有多个实现类 可以用这个指定具体的实现类*/
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@Qualifier("oracleDaoImpl")
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@Autowired
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private OracleDao oracleDao;
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@Test
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public void get() {
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List<Flow> flows = oracleDao.get();
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if (flows != null) {
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for (Flow flow : flows) {
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System.out.println(flow.getId() + " " + flow.getPlugId());
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}
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}
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}
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}
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```
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