jdbc

问题 I wanted to do batch updates using Springs JDBC template in postgre. However, I am curious that do I really need to use the jdbcTemplate.BatchUpdate() calls. I read in several places that they are slower if not implemented correctly. Will adding a @Transactional on the method that inserts in a loop achieve the same functionality of batching the updates? If the below method that inserts one record at a time, is called from a loop which is in a transactional as shown, will this cause updates to

问题 I wanted to do batch updates using Springs JDBC template in postgre. However, I am curious that do I really need to use the jdbcTemplate.BatchUpdate() calls. I read in several places that they are slower if not implemented correctly. Will adding a @Transactional on the method that inserts in a loop achieve the same functionality of batching the updates? If the below method that inserts one record at a time, is called from a loop which is in a transactional as shown, will this cause updates to

问题 Here my reader: @Bean public ItemReader<Unitat> itemReader(PagingQueryProvider queryProvider) { return new JdbcPagingItemReaderBuilder<Unitat>() .name("creditReader") .dataSource(this.dataSource) .queryProvider(queryProvider) .rowMapper(this.unitatMapper) .pageSize(2) .build(); } @Bean public SqlPagingQueryProviderFactoryBean queryProvider() { SqlPagingQueryProviderFactoryBean provider = new SqlPagingQueryProviderFactoryBean(); provider.setDataSource(this.dataSource); provider.setSelectClause

问题 Here my reader: @Bean public ItemReader<Unitat> itemReader(PagingQueryProvider queryProvider) { return new JdbcPagingItemReaderBuilder<Unitat>() .name("creditReader") .dataSource(this.dataSource) .queryProvider(queryProvider) .rowMapper(this.unitatMapper) .pageSize(2) .build(); } @Bean public SqlPagingQueryProviderFactoryBean queryProvider() { SqlPagingQueryProviderFactoryBean provider = new SqlPagingQueryProviderFactoryBean(); provider.setDataSource(this.dataSource); provider.setSelectClause

问题 I'm using version: 2.1.6.RELEASE form Spring Boot in my pom.xml-dependencies. To connect to my database I put following in application.properties: spring.datasource.url= jdbc:postgresql:// spring.datasource.username= spring.datasource.password= When checking the amount of connections in postgresql with: SELECT * FROM pg_stat_activity; I see each time I start the application exactly 10 connections are made. They almost all have the same query: SET application_name = 'PostgreSQL JDBC Driver' Is

问题 I have a Vert.x web application that needs to query an AWS RDS instance running Postgres 10.7. The Vert.x JDBC client is io.vertx:vertx-jdbc-client:3.8.4 . I want to query a table with the constraint that a certain column's value is included in a set of values: select from table where column in/any (?) I followed the Vertx documentation, which says to create a JsonArray and populate it with the values to inject into the query. The column is of type text and the list that I want to match on is

问题 I am learning how to use SQL with Java. I have installed the JDBC driver successfully and I am able to read the records from a database and print it on the screen. My problem occurs when trying to do either an update or insert statement, where nothing happens. Here is my code: Method where the problem resides public static void updateSchools(ArrayList<String> newSchool) { try { openDatabase(); stmt = c.createStatement(); int numberOfRows = stmt.executeUpdate("UPDATE schools SET address='abc'

问题 I am learning how to use SQL with Java. I have installed the JDBC driver successfully and I am able to read the records from a database and print it on the screen. My problem occurs when trying to do either an update or insert statement, where nothing happens. Here is my code: Method where the problem resides public static void updateSchools(ArrayList<String> newSchool) { try { openDatabase(); stmt = c.createStatement(); int numberOfRows = stmt.executeUpdate("UPDATE schools SET address='abc'

问题 Using Java, I need to connect to a SQL Server database using JDBC. I need to go through our companies SOCKS proxy, so I did this and it appeared to work. Connection conn = null; Properties systemProperties = System.getProperties(); systemProperties.setProperty("socksProxyHost","socksproxy.domain.com"); systemProperties.setProperty("socksProxyPort","1081"); connectionUrl = "jdbc:sqlserver://1.2.3.4:60304;databaseName=myDatabase;sslProtocol=TLSv1.2;"; Class.forName("com.microsoft.sqlserver.jdbc

问题 Using Java, I need to connect to a SQL Server database using JDBC. I need to go through our companies SOCKS proxy, so I did this and it appeared to work. Connection conn = null; Properties systemProperties = System.getProperties(); systemProperties.setProperty("socksProxyHost","socksproxy.domain.com"); systemProperties.setProperty("socksProxyPort","1081"); connectionUrl = "jdbc:sqlserver://1.2.3.4:60304;databaseName=myDatabase;sslProtocol=TLSv1.2;"; Class.forName("com.microsoft.sqlserver.jdbc