Skip to content
Advertisement

Tag: jdbctemplate

How to get list of Map data using JDBCTemplate.queryForMap

How I can get proper return type of List<Map<String, Object>> mapList = jdbctemplate.queryForList(query)); Where my query is “SELECT * FROM table_name;”. Can anyone help me? Answer You can use the following snippet to get the required map from the list: mapList.stream().collect(Collectors.toMap(k -> (Integer) k.get(“id”), k -> (String) k.get(“name”))); this is used to extract the exact data alone from the whole

BigQuery TableResult casting options

How can I cast the TableResult to the following format List<Map<String, Any>> Map contains the columns and its value respectively. Multiple rows are added to the list. I tried something like this, but it throws an error -> com.google.cloud.bigquery.TableResult cannot be cast to java.util.List How can we replicate something similar to jdbc template. For example with jdbc template we can

Write unit test for jdbcTemplate.batchUpdate() method

I have jdbcTemplate code, on which I am trying to write a unit test case. But the problem is I am unable to cover the full code. I am able to cover till: try{jdbcTemplate.batchUpdate(“update query”, new BatchPreparedStatementSetter(){ Test code snippet Please help. Answer Here the difficulty is that the new BatchPreparedStatementSetter(){ …} instance that contains the main logic that you

Why can ‘CURRENT_DATE’ not as a parameter when using NamedParameterJdbcTemplate in JAVA?

In mysql,I use this sql and it runs well. select * from student where CREATE_TIME>=DATE_SUB(curdate(),INTERVAL 24 HOUR) Now I want to use the date as a parameter,SO I use NamedParameterJdbcTemplate,If I pass the date like ‘2020-05-30’,it also runs well.But when I pass ‘CURRENT_DATE’ or ‘curdate()’,it could not search any result.How to change my code? Answer It doesn’t work, because the

jdbctemplate count queryForInt and pass multiple parameters

How can I pass multiple parameters in jdbcTemplate queryForInt to get the count. I have tried this, But its showing queryForInt as strikes. Answer Both queryForInt() and queryForLong() are deprecated since version 3.2.2 (correct me if mistake). To fix it, replace the code with queryForObject(String, Class). As per spring docs int queryForInt(String sql, Map args) Deprecated. Query for an int

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

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. Answer They are called template as use the Template method pattern.

Advertisement