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Passing string in where clause using PreparedStatement


Passing string in where clause using PreparedStatement

By : Subhodeep Ghosh
Date : October 25 2020, 07:10 PM
seems to work fine How do I use a PreparedStatement to pass a string in a where clause? , Try it like this:
code :
String username = "Mickey Mouse";
String sql = "select pass from lbdb_user WHERE username = ? ";
PreparedStatement pstmt = con.prepareStatement(sql);
pstmt.setString(1, username);


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PreparedStatement IN clause alternatives?

PreparedStatement IN clause alternatives?


By : David
Date : March 29 2020, 07:55 AM
it fixes the issue An analysis of the various options available, and the pros and cons of each is available here.
The suggested options are:
code :
query=SELECT * FROM table t WHERE t.column IN (?)
sql = any( sql, count );
/**
 * Converts a SQL statement containing exactly one IN clause to an IN clause
 * using multiple comma-delimited parameters.
 *
 * @param sql The SQL statement string with one IN clause.
 * @param params The number of parameters the SQL statement requires.
 * @return The SQL statement with (?) replaced with multiple parameter
 * placeholders.
 */
public static String any(String sql, final int params) {
    // Create a comma-delimited list based on the number of parameters.
    final StringBuilder sb = new StringBuilder(
            new String(new char[params]).replace("\0", "?,")
    );

    // Remove trailing comma.
    sb.setLength(Math.max(sb.length() - 1, 0));

    // For more than 1 parameter, replace the single parameter with
    // multiple parameter placeholders.
    if (sb.length() > 1) {
        sql = sql.replace("(?)", "(" + sb + ")");
    }

    // Return the modified comma-delimited list of parameters.
    return sql;
}
PreparedStatement with no ? in the where clause

PreparedStatement with no ? in the where clause


By : Jas
Date : March 29 2020, 07:55 AM
it fixes the issue The purpose of using prepared statement is to have dynamic variables, but as you're asking if you can hard code the whole where clause, yes you can hard code it.
PreparedStatement and 'null' value in WHERE clause

PreparedStatement and 'null' value in WHERE clause


By : John Yin
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If you do not wish to generate SQL dynamically, you may use NVL on all the nullable columns in your WHERE clause to convert null into some value that the column will never contain; and while setting the bind variables in Statement just convert null to the same value used in NVL function. For example,
not passing List of String as single parameters inside preparedStatement.setObject()

not passing List of String as single parameters inside preparedStatement.setObject()


By : Balachandar Vedachal
Date : March 29 2020, 07:55 AM
I wish did fix the issue. JDBC prepared statements cannot be used when the number of parameters is variable, like here. The ? in the query is expanded into a single value, not to several separated by commas.
What you can do is construct an sql with the appropriate number of ?s and then set each parameter in a loop.
How to use IN clause with PreparedStatement in PostgreSQL

How to use IN clause with PreparedStatement in PostgreSQL


By : t_m
Date : March 29 2020, 07:55 AM
this will help There are several ways to do this. The clean way is to pass an array to the prepared statement. An alternative to Nick's answer is to pass a proper java.sql.Array value:
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