Prepared statements improve performance by caching the execution plan for a query after the query optimizer has found the best plan. If the query you’re using doesn’t have a complicated plan (such as simple selects/inserts with no joins), then prepared statements won’t give you a big improvement since the optimizer will quickly find the best … Read more
Use PreparedStatement#setTimestamp() wherein you pass a java.sql.Timestamp which is constructed with System#currentTimeMillis(). preparedStatement.setTimestamp(index, new Timestamp(System.currentTimeMillis())); // … Alternativaly, if the DB supports it, you could also call a DB specific function to set it with the current timestamp. For example MySQL supports now() for this. E.g. String sql = “INSERT INTO user (email, creationdate) VALUES … Read more
Query is rewritten and compiled by the database server If you don’t use a prepared statement, the database server will have to parse, and compute an execution plan for the statement each time you run it. If you find that you’ll run the same statement multiple times (with different parameters) then its worth preparing the … Read more
A table name can’t be used as a parameter. It must be hard coded. So you can do something like: private String query1 = “SELECT plantID, edrman, plant, vaxnode FROM [” + reportDate + “?]”;
Prepared statement: A reference to a pre-interpreted query routine on the database, ready to accept parameters Parametrized query: A query made by your code in such a way that you are passing values in alongside some SQL that has placeholder values, usually ? or %s or something of that flavor. The confusion here seems to … Read more
The JDBC Specification 4.0 in Appendix B (Data Type Conversion Tables) states the following conversions: This table also shows the conversions used by the SQLInput reader methods, except that they use only the recommended conversions. JDBC Type Java Type ——————————————- CHAR … Read more