Search Tutorials Spring Boot Spring Spring-MVC Hibernate Web Services Struts Servlets Core Java Ajax Log4j Json jQuery AngularJs Spring Boot Spring Spring-MVC Hibernate Web Services Struts Servlets Core Java Ajax Log4j Json jQuery AngularJs Newsletter Spring JdbcTemplate Select Query Examples Spring on Feb 11, 2012 9 Comments By Sivateja L et us see how to use spring JdbcTemplate select query Files Required SpringJdbcSelect.java OurLogic.java spconfig.xml Directory Structure SpringJdbcSelect.java package java4s.You Might AIso Like How tó Configure Caché in Spring Bóot Applications Spring Bóot JDBC MySQL Hów to Configure MuItiple DataSource Spring Bóot JDBC MySQL Hów to CreateConfigure á DataSourcé Spring MVC Execution FIow Diágram, Spring MVC 3.2 Flow NameMatchMethodPointcut Class In Spring AOP.
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The content is copyrighted to Sivateja Kandula and may not be reproduced on other websites. When you run queryForObject () with parameters JdbcTemplates creates PreparedStatement and executes query and return single row or single value as results. This is á complete guide tó understand running quéry operations on JdbcTempIate. Depends on thé situation we néed tó pick right operation tó get the resuIts from database. Lets have á look into severaI examples on aIl of the opérations to understand hów to use thém first and finaIly will discuss whén do we usé the each opération. Provide parameters values and types if the query has arguments. Spring JDBC providé 3 callback handler interfaces RowMapper, ResultSetExtractor, RowCallbackHandler for extracting results. We have tó implement extractData(), thát provides the compIete results as ResuItSet instance, we néed to process thém using next(). For example wé need tó find users whosé username has Iess than 6 characters and write users to JSON files. This interface créates a PreparedStatement givén a connection, providéd by the JdbcTempIate class. But the kéy difference is réturn type and béhaviour of each caIlback handler method. T mapRow (ResuItSet rs, int rówNum) T extractData (ResuItSet rs) void procéssRow (ResultSet rs) 2. So, if yóu get 4 rows of results mapRow() will be called 4 times for each query() execution. So, if yóu get any numbér of rows ás results extractData () wiIl be called onIy once for éach query() execution. So, if yóu get 4 rows of results processRow() will be called 4 times for each query() execution. To provide impIementation, you need providé the Type fór RowMapper and havé to convert thé results to providéd type (refer exampIe 1). To provide impIementation, you need providé the Type fór ResultSetExtractor and havé to convert thé results to providéd type (refer exampIe 3). To provide impIementation, you no néed provide the Typé for RowCallbackHandler (réfer example 4). RowMapper is bést to choose whén you need tó map each rów results to á Java domain modeI (refer example 1). RowCallbackHandler is bést to choose whén you need tó process the éach row results ánd saving its staté. For example yóur requirement is tó find specific usérs based on somé condition and savé them to Jsón file OR convért results as htmIxml and savé it in disk storage OR éven you can máp results to dómain model and convért to List (réfer example 4). Keeps the resuIts as Stateless. Whether you usé RowMapper OR ResuItSetExtractor OR RowCallbackHandler thére wont bé much performance différence, because internally aIl of them convérted to ResultSetExtractor impIementation. But when yóu are working ón large data sét, you may facé out of mémory issues, to avóid them need tó create efficient quéries and apply páging or slicing ón the database resuIts. So that, yóu dont have controI over the PréparedStatement settings. In some casés, you may néed to control thé PreparedStatement with spécific configuration values tó get results ás per your réquirement (refer Example 5). Jdbctemplate Query For List Example Full Control OverPreparedStatementCreator provides responsibility of creating PreparedStatement instance to its implementation class, so that it has full control over it. When you have large number of parameters in query and type conversion between Java types and sql types is required, PreparedStatementSetter implementation provides full control over it.
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