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so-79527117

so-79527117

so-79527117

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StringBuilder sql = new StringBuilder ( "SELECT * FROM user WHERE username = ? " ) ; — One option is simple string manipulation. Your SQL command is just text in Java. Tension: if ( Objects.nonNull ( email ) ) { sql.append ( " AND email = ? " ) ; }. Outcome: PreparedStatement stm = conn.prepareCall( sql.toString() );.

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