Wednesday, 6 March 2019

Spring - Inserting data using SimpleJdbcInsert | Spring JDBC tutorial | Spring JDBC

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Inserting Data Using SimpleJdbcInsert in Spring JDBC

In standard JDBC and basic JdbcTemplate setups, executing insert statements often requires writing boilerplate SQL strings and mapping parameters manually. SimpleJdbcInsert is a powerful multi-threaded class provided by Spring JDBC that dramatically simplifies insert operations by utilizing database metadata to configure the insert statement automatically.

1. What is SimpleJdbcInsert?

SimpleJdbcInsert is part of the org.springframework.jdbc.core.simple package. It inspects table metadata directly through the JDBC driver, allowing you to execute inserts without manually writing the standard INSERT INTO table_name (...) VALUES (...) SQL statement:

Metadata Discovery: Reads column definitions and primary key configurations automatically.
Reduced Boilerplate: Eliminates tedious SQL query strings and placeholder parameter matching.
Clean Mapping: Accepts key-value pairs using Java Map implementations or bean property holders.

2. How to Configure SimpleJdbcInsert

To set up SimpleJdbcInsert in your Spring DAO or repository layer:

Initialize with DataSource: Instantiate SimpleJdbcInsert by passing the configured DataSource bean.
Define Table Name: Use the withTableName("table_name") method to specify your target table.
Specify Columns (Optional): You can optionally restrict operations to specific columns using usingColumns(...).
Auto-Generated Keys: Use usingGeneratedKeyColumns("column_name") if your table features auto-increment primary keys.

3. Executing the Insert Operation

Spring provides flexible ways to supply the data being inserted into the database:

Map-Based Execution: Pass a Map<String, Object> containing column names as keys and field values as map values directly to execute(parameters).
MapSqlParameterSource: A Spring utility class that simplifies building parameter maps with fluent chaining methods.
BeanPropertySqlParameterSource: Automatically maps getter methods on a POJO/domain model directly to matching database table columns.

4. Key Advantages of Using SimpleJdbcInsert

Leveraging SimpleJdbcInsert provides several practical benefits:

Cleaner DAO Classes: Your data access layer remains readable and free of repetitive SQL strings.
Fewer Syntax Mistakes: By avoiding manual SQL statement construction, column mismatch and type conversion bugs are minimized.
Effortless Key Retrieval: Retrieving generated database primary key IDs is handled seamlessly in a single step using executeAndReturnKey(...).

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