spring boot DAO之jdbcTemplate
阿新 • • 發佈:2018-06-07
springboot依賴
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency>
application-database.properties
#初始化數據庫的時候,如果錯誤,是否繼續啟動。 spring.datasource.continue-on-error=false #jdbc driver.默認通過uri來自動檢測。 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #jdbc url.連接數據庫的uri spring.datasource.url=jdbc:mysql://172.28.1.227:3310/fc?useUnicode=true&autoReconnect=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useServerPrepStmts=false #數據庫連接用戶名 spring.datasource.username=fcdev #數據連接密碼 spring.datasource.password=123456 #全限定名,連接池。默認自動檢測classpath spring.datasource.type=com.zaxxer.hikari.HikariDataSource #sql腳本字符 spring.datasource.sql-script-encoding=UTF-8 #jdbcTemplate配置參數 spring.jdbc.template.fetch-size=-1 spring.jdbc.template.max-rows=-1 spring.jdbc.template.query-timeout=60
源碼-JdbcProperties
@ConfigurationProperties(prefix = "spring.jdbc") public class JdbcProperties { private final Template template = new Template(); public Template getTemplate() { return this.template; } /** * {@code JdbcTemplate} settings. */ public static class Template { /** * Number of rows that should be fetched from the database when more rows are * needed. Use -1 to use the JDBC driver‘s default configuration. */ private int fetchSize = -1; /** * Maximum number of rows. Use -1 to use the JDBC driver‘s default configuration. */ private int maxRows = -1; /** * Query timeout. Default is to use the JDBC driver‘s default configuration. If a * duration suffix is not specified, seconds will be used. */ @DurationUnit(ChronoUnit.SECONDS) private Duration queryTimeout; } }
源碼-JdbcTemplateAutoConfiguration
@Configuration
@ConditionalOnClass({ DataSource.class, JdbcTemplate.class })
@ConditionalOnSingleCandidate(DataSource.class)
@AutoConfigureAfter(DataSourceAutoConfiguration.class)
@EnableConfigurationProperties(JdbcProperties.class)
public class JdbcTemplateAutoConfiguration {
@Configuration
static class JdbcTemplateConfiguration {
private final DataSource dataSource;
private final JdbcProperties properties;
JdbcTemplateConfiguration(DataSource dataSource, JdbcProperties properties) {
this.dataSource = dataSource;
this.properties = properties;
}
@Bean
@Primary
@ConditionalOnMissingBean(JdbcOperations.class)
public JdbcTemplate jdbcTemplate() {
JdbcTemplate jdbcTemplate = new JdbcTemplate(this.dataSource);
JdbcProperties.Template template = this.properties.getTemplate();
jdbcTemplate.setFetchSize(template.getFetchSize());
jdbcTemplate.setMaxRows(template.getMaxRows());
if (template.getQueryTimeout() != null) {
jdbcTemplate
.setQueryTimeout((int) template.getQueryTimeout().getSeconds());
}
return jdbcTemplate;
}
}
@Configuration
@Import(JdbcTemplateConfiguration.class)
static class NamedParameterJdbcTemplateConfiguration {
@Bean
@Primary
@ConditionalOnSingleCandidate(JdbcTemplate.class)
@ConditionalOnMissingBean(NamedParameterJdbcOperations.class)
public NamedParameterJdbcTemplate namedParameterJdbcTemplate(
JdbcTemplate jdbcTemplate) {
return new NamedParameterJdbcTemplate(jdbcTemplate);
}
}
}
jdbcTemplate使用
@Repository
public class TestJdbcDao {
@Autowired
private JdbcTemplate jdbcTemplate;
public String getMenuNameById(int id){
return jdbcTemplate.queryForObject("select name from t_sys_menu where id = ?", new Object[]{id}, String.class);
}
}
jdbcTemplate測試
@RunWith(SpringRunner.class)
@SpringBootTest
public class AppContextTest {
@Autowired
private TestJdbcDao testJdbcDao;
@Test
public void jdbcTest(){
String menuName = testJdbcDao.getMenuNameById(1);
System.out.println("menuName = " + menuName);
}
spring boot DAO之jdbcTemplate