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POSolving an SQL Result Set Error with JDBC/Spring
 

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  1. POSolving an SQL Result Set Error with JDBC/Spring
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    <p>I'm writing an application using the Spring Framework. </p> <p>Description of Exercise: Write a program that will let me create a database. The database will contain information about law schools. I can use this to add law schools, query, etc. I am getting an error message stating that my statements don't generate a Result Set. My code appears to be correct according to my knowledge, but my knowledge is obviously flawed. I am thoroughly convinced that my application.xml file has been written correctly, so I will not include it here. </p> <pre><code>import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import com.sears.domain.School; public class SchoolDaoImplementation implements SchoolDao { private static final String USERNAME = "sa"; private static final String PASSWORD = ""; private static final String CREATE_TABLE = "CREATE TABLE lawschools (name VARCHAR(15) NOT NULL PRIMARY KEY, city VARCHAR(15), state VARCHAR(2), rank INTEGER)"; private static final String INSERT_SCHOOL = "INSERT INTO lawschools (name, city, state, rank) VALUES (?, ?, ?, ?)"; private static final String SELECT_ALL_SCHOOLS = "GET * FROM lawschools"; private static final String DATABASE_URL = "jdbc:hsqldb:file:database.dat;shutdown=true"; private static final String DRIVER_NAME = "org.hsqldb.jdbcDriver"; public SchoolDaoImplementation() { try { Class.forName(DRIVER_NAME); createTable(); } catch (Exception e) { throw new RuntimeException(e); } System.out.println("School DAO implementation instantiated."); } private static void createTable() { try { Connection con = null; PreparedStatement createTable = null; try { con = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD); createTable = con.prepareStatement(CREATE_TABLE); createTable.executeUpdate(); System.out.println("Creted Table."); } finally { if (con != null) con.close(); if (createTable != null) createTable.close(); } } catch (SQLException e) { System.out.println("Assuming table has been created."); } System.out.println("Table created successfully."); } public School getSchool(String name) { return null; } public List&lt;School&gt; getSchools() { try { Connection con = null; PreparedStatement selectAllSchools = null; ResultSet allSchools = null; List&lt;School&gt; schools = new ArrayList&lt;School&gt;(); try { con = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD); selectAllSchools = con.prepareStatement(SELECT_ALL_SCHOOLS); allSchools = selectAllSchools.executeQuery(); while (allSchools.next()) { String name = allSchools.getString(1); String city = allSchools.getString(2); String state = allSchools.getString(3); int rank = allSchools.getInt(4); schools.add(new School(name, city, state, rank)); } return schools; } finally { if (con != null) con.close(); if (selectAllSchools != null) selectAllSchools.close(); if (allSchools != null) allSchools.close(); } } catch (SQLException e) { throw new RuntimeException(e); } } public List&lt;School&gt; getByRank(int rank) { return null; } public List&lt;School&gt; getByState(String state) { return null; } public void addSchool(School newSchool) { try { Connection con = null; PreparedStatement insertSchool = null; try { con = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD); insertSchool = con.prepareStatement(INSERT_SCHOOL); insertSchool.executeUpdate(); } finally { if (con != null) con.close(); if (insertSchool != null) insertSchool.close(); } } catch (SQLException e) { System.out.println("An error has occured."); } } } </code></pre> <p>Client Test: </p> <pre><code>public class ClientTest { public static void main(String[] args) { ApplicationContext container = new ClassPathXmlApplicationContext("application.xml"); RankingService service = (RankingService) container.getBean("rankingServiceProduction"); System.out.println("Welcome to the LawSchool Ranking Service\n"); service.addNewSchool(new LawSchool("Duke", "Durham", "NC", 11)); service.addNewSchool(new LawSchool("Northwestern", "Chicago", "IL", 11)); service.addNewSchool(new LawSchool("Cornell", "Ithaca", "NY", 13)); service.addNewSchool(new LawSchool("Georgetown", "District of Columbia", "DC", 14)); List&lt;School&gt; allLawSchools = service.getAllSchools(); for (School school : allLawSchools) System.out.println(school); } } </code></pre> <p>Error Message:</p> <pre><code>Exception in thread "main" java.lang.RuntimeException: java.sql.SQLException: Statement does not generate a result set at com.sears.data.SchoolDaoImplementation.getSchools(SchoolDaoImplementation.java:107) at com.sears.services.RankingServiceProduction.getAllSchools(RankingServiceProduction.java:24) at com.sears.client.ClientTest.main(ClientTest.java:22) Caused by: java.sql.SQLException: Statement does not generate a result set at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.checkIsRowCount(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.executeQuery(Unknown Source) at com.sears.data.SchoolDaoImplementation.getSchools(SchoolDaoImplementation.java:84) ... 2 more </code></pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USharryo
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. This table or related slice is empty.
    1. COIs `GET` a special SQL statement for HSQLDB?
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      1. POSolving an SQL Result Set Error with JDBC/Spring
      1. USMat
    2. CONot that I know of. Can you tell me what you're specifically referring to?
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      1. POSolving an SQL Result Set Error with JDBC/Spring
      1. USharryo
    3. COYour SELECT_ALL_SCHOOLS variable...
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      1. POSolving an SQL Result Set Error with JDBC/Spring
      1. USMat
 

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