jdbctemplate

How exactly JdbcTemplate with TransactionManager works together?

由 泄露秘密 提交于 2020-01-03 11:03:56
问题 As far as I understood DataSourceTransactionManager binds a JDBC connection from the specified DataSource to the current thread, allowing for one thread-bound Connection per DataSource. If it's a pool of connections, it will take one of the available connections. After this if I use JdbcTemplate inside a transaction, it will capture a connection binded by DataSourceTransactionManager. Do I understand the mechanism correctly? A there any requirements for making transaction manager bean

How exactly JdbcTemplate with TransactionManager works together?

由 99封情书 提交于 2020-01-03 11:03:09
问题 As far as I understood DataSourceTransactionManager binds a JDBC connection from the specified DataSource to the current thread, allowing for one thread-bound Connection per DataSource. If it's a pool of connections, it will take one of the available connections. After this if I use JdbcTemplate inside a transaction, it will capture a connection binded by DataSourceTransactionManager. Do I understand the mechanism correctly? A there any requirements for making transaction manager bean

spring boot atomikos multiple datasource connection pool exhausted plain jdbc

由 此生再无相见时 提交于 2020-01-03 01:23:48
问题 I have a Spring Boot application that uses Atomikos for JTA Managed Transactions. It uses multiple DataSources to connect multiple Databases. The first request returns the expected Result but the second request failes with a 'Pool exhausted' Exception. I tried it with plain JDBC and JdbcTemplate with no result. It is the same. Here is my code with Spring Boot Version 1.5.8.RELEASE @SpringBootApplication @EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class,

JDBCTemplate optional parameters

由 爱⌒轻易说出口 提交于 2020-01-02 04:09:05
问题 I am using spring JDBCTemplate. I have a scenario, where the parameters that need to be passed into my query function, are conditional/optional. For example, I have the following code: List<RealTimeDTO> result = jdbcTemplate.query(sql, new Object[] {custId, number, requestType, startDate, endDate}, new CCCRowMapper()); In the code, I passed in custId, number, requestType, etc. However, requestType is an optional parameter that may come back as null or empty so I don't want it to be passed

JDBCTemplate optional parameters

由 ╄→尐↘猪︶ㄣ 提交于 2020-01-02 04:09:05
问题 I am using spring JDBCTemplate. I have a scenario, where the parameters that need to be passed into my query function, are conditional/optional. For example, I have the following code: List<RealTimeDTO> result = jdbcTemplate.query(sql, new Object[] {custId, number, requestType, startDate, endDate}, new CCCRowMapper()); In the code, I passed in custId, number, requestType, etc. However, requestType is an optional parameter that may come back as null or empty so I don't want it to be passed

Spring笔记4

由 陌路散爱 提交于 2020-01-01 12:50:04
Spring中的JdbcTemplate JdbcTemplate:他是spring框架中提供的一个对象，是对原始Jdbc API对象的简单封装。 JdbcTemplate的作用：用于和数据库交互的，实现对表的CRUD操作 JdbcTemplate的入门 导入相关的坐标 <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.0.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.0.3.RELEASE</version> </dependency> <dependency>

What are template classes in Spring Java? Why are they called templates? For example jdbc-template, jms-template etc

由 [亡魂溺海] 提交于 2020-01-01 07:55:43
问题 I'm new to Java. I've only been programming it for about a year. What does Spring mean by the use of templates? In Spring, there is jdbc-templates, jms-templates etc.. What are template classes in java? Are they a special kind of design pattern or what? Thank you in advance. 回答1: They are called template as use the Template method pattern. http://en.wikipedia.org/wiki/Template_method_pattern Basically the idea is define the operation needed to do something in an abstract class or super class

What is proper way to use PreparedStatementCreator of Spring JDBC?

由 为君一笑 提交于 2020-01-01 04:40:31
问题 As per my understanding the use of PreparedStatement in Java is we can use it multiple times. But I have some confusion using PreparedStatementCreator of Spring JDBC. For example consider following code, public class SpringTest { JdbcTemplate jdbcTemplate; PreparedStatementCreator preparedStatementCreator; ResultSetExtractor<String> resultSetExtractor; public SpringTest() throws SQLException { jdbcTemplate = new JdbcTemplate(OracleUtil.getDataSource()); preparedStatementCreator = new

Spring的数据库开发

由 这一生的挚爱 提交于 2020-01-01 01:00:59
spring的jdbcTemplate操作（用在dao层） spring框架是一个一站式框架，在每一层都提供了解决技术：在Dao层是使用了jdbcTemplate。 spring针对不同的持久化技术都提供了不同的模板。 Spring JDBC 　　Spring的JDBC模板负责提供数据库资源的管理和错误处理，大大简化了开发人员对数据库操作，使得开发人员可以从繁琐的数据库操作中解脱出来。 Spring jdbcTemplate的解析 　　针对数据库的操作，Spring框架提供了jdbcTemplate类，该类是Spring框架数据层的基础，其他更高层次的抽象类是构建在JdbcTemplate类之上，可以说，JdbcTemplate是Spring JDBC的核心类。 　　JdbcTemplata类的继承关系十分简单，它继承了JdbcAccessor抽象类，同时实现了JdbcOperations接口。 　　JdbcAccessor的设计中，对DataSource数据源进行了管理和配置，JdbcOperation接口定义中，定义了通过JDBC操作数据库的基本方法，而核心类JdbcTemplate提供了这些接口方法的实现。 Spring JDBC的配置 　　Spring JDBC模板主要是有四个包组成，分别是core(核心包)，dataSource（数据源包），object(对象包)

Spring（四）

由 两盒软妹~` 提交于 2020-01-01 00:49:41
Spring 中的 JdbcTemplate JdbcTemplate 概述 它是 spring 框架中提供的一个对象，是对原始 Jdbc API 对象的简单封装。spring 框架为我们提供了很多 的操作模板类。 操作关系型数据的： JdbcTemplate HibernateTemplate 操作 nosql 数据库的： RedisTemplate 操作消息队列的： JmsTemplate 我们今天的主角在 spring-jdbc-5.0.2.RELEASE.jar 中，我们在导包的时候，除了要导入这个 jar 包 外， 还需要导入一个 spring-tx-5.0.2.RELEASE.jar（它是和事务相关的）。 JdbcTemplate 对象的创建 我们可以参考它的源码，来一探究竟： public JdbcTemplate() { } public JdbcTemplate(DataSource dataSource) { setDataSource(dataSource); afterPropertiesSet(); } public JdbcTemplate(DataSource dataSource, boolean lazyInit) { setDataSource(dataSource); setLazyInit(lazyInit);
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