Per a senior member in the Spring forums, the Spring DataSource is not intended for production use: The above answers are only part of the solution. Indeed you need proper transaction managent AND you need a connection pool. The DriverManagerDataSource is NOT meant for production, it opens and closes a datebase connection each time it … Read more
In modern JVM’s you shouldn’t be worrying about SQL string concatenation too much. The true overhead any database abstraction layer may produce (compared to the relatively high round-trip time to the database and back), is usually due to second-level caching, which is done in Hibernate/JPA. Or by inefficiently mapping object models to SQL in a … Read more
The problem is that you are setting autocommit on a Connection, but JdbcTemplate doesn’t remember that Connection; instead, it gets a new Connection for each operation, and that might or might not be the same Connection instance, depending on your DataSource implementation. Since defaultAutoCommit is not a property on DataSource, you have two options: Assuming … Read more
Where did this come from: database.driverClassName=org.postgresql.Driver? Don’t you mean spring.datasource.driverClassName?
As said by a previous response there is many possible causes. One of them is that the table isn’t created because of syntax incompatibility. If specific DB vendor syntax or specific capability is used, HSQLDB will not recognize it. Then while the creation code is executed you could see that the table is not created … Read more
you need to write this structure on your bean configuration (this is your datasource): <bean id=”hikariConfig” class=”com.zaxxer.hikari.HikariConfig”> <property name=”poolName” value=”springHikariCP” /> <property name=”connectionTestQuery” value=”SELECT 1″ /> <property name=”dataSourceClassName” value=”${hibernate.dataSourceClassName}” /> <property name=”maximumPoolSize” value=”${hibernate.hikari.maximumPoolSize}” /> <property name=”idleTimeout” value=”${hibernate.hikari.idleTimeout}” /> <property name=”dataSourceProperties”> <props> <prop key=”url”>${dataSource.url}</prop> <prop key=”user”>${dataSource.username}</prop> <prop key=”password”>${dataSource.password}</prop> </props> </property> </bean> <!– HikariCP configuration –> <bean … Read more
You could replace constructor-based dependency injection with setter-based dependency injection to resolve the cycle, see Spring Framework Reference Documentation: Circular dependencies If you use predominantly constructor injection, it is possible to create an unresolvable circular dependency scenario. For example: Class A requires an instance of class B through constructor injection, and class B requires an … Read more
To populate a List of String, you need not use custom row mapper. Implement it using queryForList. List<String>data=jdbcTemplate.queryForList(query,String.class)
When you use JdbcTemplate you give it SQL that has a ? placeholder for each parameter you want substituted into the SQL. When you assign parameters in the code you have to pass in arguments in an array and they get used in the order in which they appear in the array, like this: Object[] … Read more
The SSL connection to the database is failing, try changing your datasource URL to: spring.datasource.url=jdbc:mysql://localhost:3306/employee_database?useSSL=false