217 lines
7.3 KiB
Markdown
217 lines
7.3 KiB
Markdown
# Spring 整合 JDBC Template（XML 配置方式）
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<nav>
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<a href="#一说明">一、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、说明
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#### 1.1 项目结构
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-jdbc.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 `jdbc.properties`，内容如下：
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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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# 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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#### 2.2 配置数据源
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在配置文件中配置 JDBC 数据源并定义事务管理器：
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
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<!-- 开启注解包扫描-->
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<context:component-scan base-package="com.heibaiying.*"/>
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<!--指定配置文件的位置-->
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<context:property-placeholder location="classpath:jdbc.properties"/>
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<!--配置数据源-->
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<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
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<!--Mysql 配置-->
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<property name="driverClassName" value="${mysql.driverClassName}"/>
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<property name="url" value="${mysql.url}"/>
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<property name="username" value="${mysql.username}"/>
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<property name="password" value="${mysql.password}"/>
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<!--Oracle 配置-->
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<!--<property name="driverClassName" value="${oracle.driverClassName}"/>
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<property name="url" value="${oracle.url}"/>
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<property name="username" value="${oracle.username}"/>
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<property name="password" value="${oracle.password}"/>-->
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</bean>
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<!--配置 jdbcTemplate -->
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<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
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<!--引用上面的数据源-->
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!--定义事务管理器-->
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<bean id="transactionManager"
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class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!-- 开启事务注解@Transactional 支持 -->
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<tx:annotation-driven/>
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</beans>
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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({"classpath:springApplication.xml"})
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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({"classpath:springApplication.xml"})
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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 可以用这个注解指定具体的实现类*/
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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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