How to Correctly Use setDate() in PreparedStatements to Avoid IllegalArgumentException?

PreparedStatement's setDate() Method: Best Practices to Prevent Errors

Migrating to prepared statements improves code consistency, but using setDate() can sometimes lead to IllegalArgumentException errors. Let's examine how to avoid these issues.

Consider this problematic code snippet:

<code class="language-java">DateFormat dateFormatYMD = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
DateFormat dateFormatMDY = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date now = new Date();
String vDateYMD = dateFormatYMD.format(now);
String vDateMDY = dateFormatMDY.format(now);
String vDateMDYSQL =  vDateMDY ;
java.sql.Date date = new java.sql.Date(0000-00-00); //Incorrect date initialization

requestSQL = "INSERT INTO CREDIT_REQ_TITLE_ORDER (REQUEST_ID," + 
             " ORDER_DT, FOLLOWUP_DT) " +  "values(?,?,?,)";

prs = conn.prepareStatement(requestSQL);
prs.setInt(1,new Integer(requestID));
prs.setDate(2,date.valueOf(vDateMDYSQL));
prs.setDate(3,date.valueOf(sqlFollowupDT));</code>

The IllegalArgumentException likely stems from improper date handling. Avoid using date.valueOf() with inconsistently formatted strings and incorrect date initialization.

Correct Approaches Using java.sql.Date and java.sql.Timestamp

Here's how to correctly use setDate() and setTimestamp() for different database column types:

For DATE columns:

• Using a String: ps.setDate(2, java.sql.Date.valueOf("2013-09-04")); (Ensure "YYYY-MM-DD" format)
• Using a java.util.Date: ps.setDate(2, new java.sql.Date(endDate.getTime()));
• Using the current date: ps.setDate(2, new java.sql.Date(System.currentTimeMillis()));

For TIMESTAMP or DATETIME columns:

• Using a String: ps.setTimestamp(2, java.sql.Timestamp.valueOf("2013-09-04 13:30:00")); (Ensure "YYYY-MM-DD HH:mm:ss" format)
• Using a java.util.Date: ps.setTimestamp(2, new java.sql.Timestamp(endDate.getTime()));
• Using the current timestamp: ps.setTimestamp(2, new java.sql.Timestamp(System.currentTimeMillis()));

By adhering to these best practices and using the appropriate data types and formats, you can reliably use setDate() and setTimestamp() within your prepared statements, preventing IllegalArgumentException errors and ensuring data integrity. Remember to always match your date/time string formats to the database's expectations.

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