SpringBoot整合JDBC学习笔记
1.创建工程
2.Linux启动数据库
3.连接数据库
com.mysql.jdbc.Driver过时了，改成新的
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
数据源自动配置原理
数据源的配置都在这
自动配置原理都这
DataSourceConfiguration//数据源的配置
源码
//springboot默认支持的连池：
//org.apache.commons.dbcp2.BasicDataSource
//com.zaxxer.hikari.HikariDataSource
//org.apache.tomcat.jdbc.pool.DataSource
//给容器中加数据源的，根据配置创建数据源，默认使用Hikari连接池；可以使用spring.datasource.type指定自定义的数据源类型；
abstract class DataSourceConfiguration {
/**
* Tomcat Pool DataSource configuration.
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(org.apache.tomcat.jdbc.pool.DataSource.class)
@ConditionalOnMissingBean(DataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "org.apache.tomcat.jdbc.pool.DataSource",
matchIfMissing = true)
static class Tomcat {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.tomcat")
org.apache.tomcat.jdbc.pool.DataSource dataSource(DataSourceProperties properties) {
org.apache.tomcat.jdbc.pool.DataSource dataSource = createDataSource(properties,
org.apache.tomcat.jdbc.pool.DataSource.class);
DatabaseDriver databaseDriver = DatabaseDriver.fromJdbcUrl(properties.determineUrl());
String validationQuery = databaseDriver.getValidationQuery();
if (validationQuery != null) {
dataSource.setTestOnBorrow(true);
dataSource.setValidationQuery(validationQuery);
}
return dataSource;
}
}
/**
* Hikari DataSource configuration.
*/
@Configuration(proxyBeanMethods = false)
//1.如果导入了HikariDataSource
@ConditionalOnClass(HikariDataSource.class)
//2.并且spring.datasource.type是com.zaxxer.hikari.HikariDataSource
@ConditionalOnMissingBean(DataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.zaxxer.hikari.HikariDataSource",
matchIfMissing = true)
static class Hikari {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.hikari")
//3.那么就导入HikariDataSource
HikariDataSource dataSource(DataSourceProperties properties) {
HikariDataSource dataSource = createDataSource(properties, HikariDataSource.class);
if (StringUtils.hasText(properties.getName())) {
dataSource.setPoolName(properties.getName());
}
return dataSource;
}
}
/**
* Generic DataSource configuration.
* 自定义数据源，如果数据源类型不是以上几种，就创建这个
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingBean(DataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type")
static class Generic {
@Bean
DataSource dataSource(DataSourceProperties properties) {
//使用DataSourceBuilder创建数据源，利用反射创建响应type的数据源，并且绑定相关属性
return properties.initializeDataSourceBuilder().build();
}
}
}
initializeDataSourceBuilder()//使用DataSourceBuilder创建数据源
源码
@ConfigurationProperties(prefix = "spring.datasource")
public class DataSourceProperties implements BeanClassLoaderAware, InitializingBean {
public DataSourceBuilder<?> initializeDataSourceBuilder() {
//创建数据源
return DataSourceBuilder.create(getClassLoader()).type(getType()).driverClassName(determineDriverClassName())
.url(determineUrl()).username(determineUsername()).password(determinePassword());
}
}
create()//创建数据源
源码：
public final class DataSourceBuilder<T extends DataSource> {
public static DataSourceBuilder<?> create(ClassLoader classLoader) {
return new DataSourceBuilder<>(classLoader);
}
@SuppressWarnings("unchecked")
public T build() {
Class<? extends DataSource> type = getType();
//BeanUtils工具进行反射创建数据源
DataSource result = BeanUtils.instantiateClass(type);
maybeGetDriverClassName();
//绑定相关的属性
bind(result);
return (T) result;
}
}
DataSourceAutoConfiguration//数据源的自动配置
源码
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass({ DataSource.class, EmbeddedDatabaseType.class })
@ConditionalOnMissingBean(type = "io.r2dbc.spi.ConnectionFactory")
@EnableConfigurationProperties(DataSourceProperties.class)
@Import({ DataSourcePoolMetadataProvidersConfiguration.class, DataSourceInitializationConfiguration.class })
public class DataSourceAutoConfiguration {
static class Registrar implements ImportBeanDefinitionRegistrar {
private static final String BEAN_NAME = "dataSourceInitializerPostProcessor";
@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata,
BeanDefinitionRegistry registry) {
if (!registry.containsBeanDefinition(BEAN_NAME)) {
GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
beanDefinition.setBeanClass(DataSourceInitializerPostProcessor.class);
beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
// We don't need this one to be post processed otherwise it can cause a
// cascade of bean instantiation that we would rather avoid.
beanDefinition.setSynthetic(true);
registry.registerBeanDefinition(BEAN_NAME, beanDefinition);
}
}
}
}
DataSourceInitializerPostProcessor
源码：
class DataSourceInitializerPostProcessor implements BeanPostProcessor, Ordered {
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof DataSource) {
// force initialization of this bean as soon as we see a DataSource
//看到数据源就执行这个方法
this.beanFactory.getBean(DataSourceInitializerInvoker.class);
}
return bean;
}
}
DataSourceInitializationConfiguration
源码：
@Configuration(proxyBeanMethods = false)
@Import({ DataSourceInitializerInvoker.class, DataSourceInitializationConfiguration.Registrar.class })
class DataSourceInitializationConfiguration {
}
DataSourceInitializerInvoker
源码：
//ApplicationListener监听器，
//作用：初始化时可以帮我们运行schema的schema-*.sql，data-*.sql
class DataSourceInitializerInvoker implements ApplicationListener<DataSourceSchemaCreatedEvent>, InitializingBean {
@Override
public void afterPropertiesSet() {
DataSourceInitializer initializer = getDataSourceInitializer();
if (initializer != null) {
//运行建表语句
boolean schemaCreated = this.dataSourceInitializer.createSchema();
if (schemaCreated) {
initialize(initializer);
}
}
}
private void initialize(DataSourceInitializer initializer) {
try {
this.applicationContext.publishEvent(new DataSourceSchemaCreatedEvent(initializer.getDataSource()));
// The listener might not be registered yet, so don't rely on it.
if (!this.initialized) {
this.dataSourceInitializer.initSchema();
this.initialized = true;
}
}
catch (IllegalStateException ex) {
logger.warn(LogMessage.format("Could not send event to complete DataSource initialization (%s)",
ex.getMessage()));
}
}
private DataSourceInitializer getDataSourceInitializer() {
if (this.dataSourceInitializer == null) {
DataSource ds = this.dataSource.getIfUnique();
if (ds != null) {
this.dataSourceInitializer = new DataSourceInitializer(ds, this.properties, this.applicationContext);
}
}
return this.dataSourceInitializer;
}
//监听器监听到事件后调用这个方法
@Override
public void onApplicationEvent(DataSourceSchemaCreatedEvent event) {
// NOTE the event can happen more than once and
// the event datasource is not used here
DataSourceInitializer initializer = getDataSourceInitializer();
if (!this.initialized && initializer != null) {
//运行插入数据的语句
initializer.initSchema();
this.initialized = true;
}
}
}
DataSourceInitializer
源码：
//运行建表语句
boolean createSchema() {
List<Resource> scripts = getScripts("spring.datasource.schema", this.properties.getSchema(), "schema");
if (!scripts.isEmpty()) {
if (!isEnabled()) {
logger.debug("Initialization disabled (not running DDL scripts)");
return false;
}
String username = this.properties.getSchemaUsername();
String password = this.properties.getSchemaPassword();
runScripts(scripts, username, password);
}
return !scripts.isEmpty();
}
/**
* Initialize the schema if necessary.
* @see DataSourceProperties#getData()
* //运行插入数据的语句
*/
void initSchema() {
List<Resource> scripts = getScripts("spring.datasource.data", this.properties.getData(), "data");
if (!scripts.isEmpty()) {
if (!isEnabled()) {
logger.debug("Initialization disabled (not running data scripts)");
return;
}
String username = this.properties.getDataUsername();
String password = this.properties.getDataPassword();
runScripts(scripts, username, password);
}
}
private void runScripts(List<Resource> resources, String username, String password) {
if (resources.isEmpty()) {
return;
}
ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
populator.setContinueOnError(this.properties.isContinueOnError());
populator.setSeparator(this.properties.getSeparator());
if (this.properties.getSqlScriptEncoding() != null) {
populator.setSqlScriptEncoding(this.properties.getSqlScriptEncoding().name());
}
for (Resource resource : resources) {
populator.addScript(resource);
}
DataSource dataSource = this.dataSource;
if (StringUtils.hasText(username) && StringUtils.hasText(password)) {
dataSource = DataSourceBuilder.create(this.properties.getClassLoader())
.driverClassName(this.properties.determineDriverClassName()).url(this.properties.determineUrl())
.username(username).password(password).build();
}
DatabasePopulatorUtils.execute(populator, dataSource);
}
默认只需要将文件命名为：
schema-*.sql、data-*.sql
建表语句时候
/**
* Create the schema if necessary.
* @return {@code true} if the schema was created
* @see DataSourceProperties#getSchema()
*/
boolean createSchema() {
//得到这个文件
List<Resource> scripts = getScripts("spring.datasource.schema", this.properties.getSchema(), "schema");
if (!scripts.isEmpty()) {
if (!isEnabled()) {
logger.debug("Initialization disabled (not running DDL scripts)");
return false;
}
String username = this.properties.getSchemaUsername();
String password = this.properties.getSchemaPassword();
runScripts(scripts, username, password);
}
return !scripts.isEmpty();
}
//可以指定文件路径
private List<Resource> getScripts(String propertyName, List<String> resources, String fallback) {
if (resources != null) {
return getResources(propertyName, resources, true);
}
//如果获取不到，就找classpath*:schema-all.sql或classpath*:schema.sql
String platform = this.properties.getPlatform();
List<String> fallbackResources = new ArrayList<>();
fallbackResources.add("classpath*:" + fallback + "-" + platform + ".sql");
fallbackResources.add("classpath*:" + fallback + ".sql");
return getResources(propertyName, fallbackResources, false);
}
platform
源码：
/**
* Platform to use in the DDL or DML scripts (such as schema-${platform}.sql or
* data-${platform}.sql).
*/
private String platform = "all";
没建起来
添加initialization-mode: always就好了
可以指定文件
/**
* {@link EnableAutoConfiguration Auto-configuration} for {@link JdbcTemplate} and
* {@link NamedParameterJdbcTemplate}.
*
* @author Dave Syer
* @author Phillip Webb
* @author Stephane Nicoll
* @author Kazuki Shimizu
* @since 1.4.0
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass({ DataSource.class, JdbcTemplate.class })
@ConditionalOnSingleCandidate(DataSource.class)
@AutoConfigureAfter(DataSourceAutoConfiguration.class)
@EnableConfigurationProperties(JdbcProperties.class)
//有数据源的情况下，在容器中添加jdbcTemplate和namedParameterJdbcTemplate（具名参数）
@Import({ JdbcTemplateConfiguration.class, NamedParameterJdbcTemplateConfiguration.class })
public class JdbcTemplateAutoConfiguration {
}
JdbcTemplateConfiguration
源码：
/**
* Configuration for {@link JdbcTemplateConfiguration}.
*
* @author Stephane Nicoll
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingBean(JdbcOperations.class)
class JdbcTemplateConfiguration {
@Bean
@Primary
JdbcTemplate jdbcTemplate(DataSource dataSource, JdbcProperties properties) {
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
JdbcProperties.Template template = properties.getTemplate();
jdbcTemplate.setFetchSize(template.getFetchSize());
jdbcTemplate.setMaxRows(template.getMaxRows());
if (template.getQueryTimeout() != null) {
jdbcTemplate.setQueryTimeout((int) template.getQueryTimeout().getSeconds());
}
return jdbcTemplate;
}
}
NamedParameterJdbcTemplateConfiguration
源码：
/**
* Configuration for {@link NamedParameterJdbcTemplate}.
*
* @author Stephane Nicoll
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnSingleCandidate(JdbcTemplate.class)
@ConditionalOnMissingBean(NamedParameterJdbcOperations.class)
class NamedParameterJdbcTemplateConfiguration {
@Bean
@Primary
NamedParameterJdbcTemplate namedParameterJdbcTemplate(JdbcTemplate jdbcTemplate) {
return new NamedParameterJdbcTemplate(jdbcTemplate);
}
}
jdbcTemplate操作数据库
没显示出来页面
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:653) ~[na:1.8.0_131]
at java.util.ArrayList.get(ArrayList.java:429) ~[na:1.8.0_131]
at com.aitiguigu.springbootjdbc.controller.HelloController.query(HelloController.java:26) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.35.jar:9.0.35]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.35.jar:9.0.35]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
原来项目启动完后，又执行了建表语句，数据库中表的数据没了，需要从新写。或是把建表的删除
