When to use an expression on a prepared statement?

Question

When to use an instruction instead of a prepared statement. I assume that the operator is used in queries without parameters, but why not use a prepared statement? Which one is faster for queries without parameters.

Answer 1

I assume that the operator is used in queries without parameters, but why not use a prepared statement?

It is not even close. PreparedStatements are used for INSERT, UPDATE, and DELETE statements that return a ResultSet or the number of updates. They will not work for DDL statements, as pointed out by Joachim, and they will not work for calling stored procedures in which CallableStatement must be used (this is not the difference between the two classes). For queries without binding parameters, PreparedStatements may turn out to be better than statements (see below).

Which one is faster for queries without parameters.

PreparedStatements will run faster in the long run, with longer use in a single connection. This is due to the fact that although PreparedStatements needs to be compiled, which takes some time (it really isn’t so much, so don’t see it as a drawback), the compiled version essentially contains a link to the SQL execution plan in the database. After compilation, the PreparedStatement is stored in a connection-specific cache, so that the compiled version can be reused to achieve improved performance. If you use JDBC batch operations, using PreparedStatements will make batch execution much faster than using simple Statement objects, where you may have to prepare the plan again and again if the database needs to do this.

Answer 2

It depends on your requirement.

If you have an SQL statement that runs in a loop or often with different parameters, then PreparedStatement is the best candidate because it gets pre-compiled and caches the execution plan for this parameterized SQL query. Each time it is launched from the same PreparedStatement, it will use a cache plan and gives better performance.

You can also exclude SQL injection using PreparedStatement.

But if you are sure that you execute the SQL query only once, sometimes the statement will be the best candidate, because when creating the PreparedStatement object it sometimes calls an additional db call, if the driver supports preliminary compilation, the Connection.prepareStatement (java.lang.String) method will send instructions to the database for preliminary compilation.

Read the article below to understand "Statement Versus PreparedStatement"

• Java programming using Oracle JDBC