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I have the below questions on Prepared Statements in Java.
Is it beneficial to use Prepared Statements when the SQL Query does not have any Where clause ? Assume a simple query Select * from tablename;
It is said that the Prepared Statement is compiled once and only the values are substituted the second time. Hence it is faster as the Query validation and compilation step can be skipped. Where is the compiled form stored ? What is the life time of this compiled form ?
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The PreparedStatement interface extends the Statement interface it represents a precompiled SQL statement which can be executed multiple times. This accepts parameterized SQL quires and you can pass 0 or more parameters to this query.
JDBC API Interface These interfaces look very similar. However, they differ significantly from one another in features and performance: Statement – Used to execute string-based SQL queries. PreparedStatement – Used to execute parameterized SQL queries.
Create a Statement: From the connection interface, you can create the object for this interface. It is generally used for general–purpose access to databases and is useful while using static SQL statements at runtime. Syntax: Statement statement = connection.
A prepared statement is a feature used to execute the same (or similar) SQL statements repeatedly with high efficiency. Prepared statements basically work like this: Prepare: An SQL statement template is created and sent to the database.
A PreparedStatement is beneficial when there are parameters to be passed and when the query is to be executed repeatedly. If there is a simple query to be fired once, a Statement will prove faster.
The caching takes place on DB server. The DB server has APIs that help caching compiled queries. Hence for repeated execution of queries, the same compiled query will run again and boost performance.
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