Historically, databases have used 1-based indexing for bound parameters. This probably reflects the origins of relational databases in set theory and mathematics, which index elements starting with one, and use zero to represent a null or empty set. In shell scripts and regular expressions, the zero index usually means something “special”. For example, in the … Read more
Using string concatenation for constructing your query from arbitrary input will not make PreparedStatement safe. Take a look at this example: preparedStatement = “SELECT * FROM users WHERE name=”” + userName + “”;”; If somebody puts ‘ or ‘1’=’1 as userName, your PreparedStatement will be vulnerable to SQL injection, since that query will be executed … Read more
By default, the JDBCTemplate does its own PreparedStatement internally, if you just use the .update(String sql, Object … args) form. Spring, and your database, will manage the compiled query for you, so you don’t have to worry about opening, closing, resource protection, etc. One of the saving graces of Spring. A link to Spring 2.5’s … Read more
You can’t. You need to contruct the sql with string concatenation/placeholder with String.format. prepared statement is for the column values not for table name.
You may want to use setArray method as mentioned in the javadoc below: http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setArray(int, java.sql.Array) Sample Code: PreparedStatement pstmt = conn.prepareStatement(“select * from employee where id in (?)”); Array array = conn.createArrayOf(“VARCHAR”, new Object[]{“1”, “2”,”3″}); pstmt.setArray(1, array); ResultSet rs = pstmt.executeQuery();
I’ve always done it the way you show in your question. Setting the same parameter twice is not such a huge hardship, is it? SELECT * FROM tableA WHERE x = ? OR (x IS NULL AND ? IS NULL);
It should be: cursor.execute (“”” UPDATE tblTableName SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s WHERE Server=%s “””, (Year, Month, Day, Hour, Minute, ServerID)) You can also do it with basic string manipulation, cursor.execute (“UPDATE tblTableName SET Year=%s, Month=%s, Day=%s, Hour=%s, Minute=%s WHERE Server=”%s” ” % (Year, Month, Day, Hour, Minute, ServerID)) but this way is discouraged … Read more
This indicates a bad DB design. The user shouldn’t need to know about the column names. Create a real DB column which holds those “column names” and store the data along it instead. And any way, no, you cannot set column names as PreparedStatement values. You can only set column values as PreparedStatement values If … Read more