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POJDBC Error : unable to execute string in DB query
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copied!<p>I want to pass <strong>strings</strong> as parameters to my <strong>JDBC</strong> program. The code works fine for <strong>INT</strong> type inputs but goes to catch block on string type inputs.</p> <p>I wanted to modify the program such that it can capture all types of inputs at random. Because, I need to run the following java prog. in bash script. So once class file is generated, i supposed to provide random inputs to the program and obtain the output...</p> <pre class="lang-java prettyprint-override"><code>import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import com.mysql.jdbc.Statement; public class JDBC_run { public static void main(String[] args) throws Exception { Connection conn = null; // int var = 123050044 ; String var = "sir"; Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection( "jdbc:mysql://localhost/test?user=root&password=root"); ResultSet rs; System.out.println("Connected?"); try{ Statement st = (com.mysql.jdbc.Statement) conn.createStatement(); rs = st.executeQuery("SELECT type FROM Table_new WHERE id = " + var); while ( rs.next() ) { String lastName = rs.getString("type"); System.out.println(lastName); } } catch(SQLException s){ System.out.println("wrong !!"); } } } </code></pre> <p>For <strong>int var = 123050044</strong>, the output is </p> <pre><code>Connected? student </code></pre> <p>For <strong>String var = "sir"</strong>, the output is </p> <pre><code>Connected? wrong !! </code></pre>

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