How to query for a List in JdbcTemplate?
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)
jdbctemplate
How to get Map data using JDBCTemplate.queryForMap
queryForMap is appropriate if you want to get a single row. You are selecting without a where clause, so you probably want to queryForList. The error is probably indicative of the fact that queryForMap wants one row, but you query is retrieving many rows. Check out the docs. There is a queryForList that takes just … Read more
NamedParameterJdbcTemplate vs JdbcTemplate
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
what is difference between ResultSetExtractor vs Rowmapper?
Basic difference is with ResultsetExtractor you will need to iterate through the result set yourself, say in while loop. This interface provides you processing of the entire ResultSet at once. The implemetation of Interface method extractData(ResultSet rs) will contain that manual iteration code. See one implementation of ResultsetExtractor while some callback handlers like RowCallbackHandler, the … Read more
Spring Boot: Jdbc javax.net.ssl.SSLException: closing inbound before receiving peer’s close_notify
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
identity from sql insert via jdbctemplate
The JDBCTemplate.update method is overloaded to take an object called a GeneratedKeyHolder which you can use to retrieve the autogenerated key. For example (code taken from here): final String INSERT_SQL = “insert into my_test (name) values(?)”; final String name = “Rob”; KeyHolder keyHolder = new GeneratedKeyHolder(); jdbcTemplate.update( new PreparedStatementCreator() { public PreparedStatement createPreparedStatement(Connection connection) throws … Read more
How to execute INSERT statement using JdbcTemplate class from Spring Framework
Use jdbcTemplate.update(String sql, Object… args) method: jdbcTemplate.update( “INSERT INTO schema.tableName (column1, column2) VALUES (?, ?)”, var1, var2 ); or jdbcTemplate.update(String sql, Object[] args, int[] argTypes), if you need to map arguments to SQL types manually: jdbcTemplate.update( “INSERT INTO schema.tableName (column1, column2) VALUES (?, ?)”, new Object[]{var1, var2}, new Object[]{Types.TYPE_OF_VAR1, Types.TYPE_OF_VAR2} );
Spring JDBC Template for calling Stored Procedures
There are a number of ways to call stored procedures in Spring. If you use CallableStatementCreator to declare parameters, you will be using Java’s standard interface of CallableStatement, i.e register out parameters and set them separately. Using SqlParameter abstraction will make your code cleaner. I recommend you looking at SimpleJdbcCall. It may be used like … Read more
JPA vs Spring JdbcTemplate [closed]
Use Spring JdbcTemplate if you don’t want to access your database schema via a domain model. Using JdbcTemplate you are using a lower level access, with more flexibility, but probably also more boilerplate. Spring JdbcTemplate can be more easily used with exotic database schemas and a stored procedure focus. Using JPA you need to make … Read more
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
What I think is that somebody realized that the queryForInt/Long methods has confusing semantics, that is, from JdbcTemplate source code you can see its current implementation: @Deprecated public int queryForInt(String sql, Object… args) throws DataAccessException { Number number = queryForObject(sql, args, Integer.class); return (number != null ? number.intValue() : 0); } which may lead you … Read more