kern/src/de/memtext/db/HsqlProcedures.java

package de.memtext.db;

import java.sql.Statement;

/**
 * @author MB
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */
public class HsqlProcedures {

    /**
     * Constructor for HsqlProcedures.
     */
    private HsqlProcedures() {
        super();
    }

    public static Integer get1() {
        return Integer.valueOf(1);

    }

    public static void alterTableColumnIntegerToVarchar(java.sql.Connection con, String tablename, String columnname) {
        try {
            Statement stmt = con.createStatement();
            // add new tmp varchar col
            stmt.execute("alter table " + tablename + " add column tmp" + columnname + " varchar");
            //update value of tmp
            stmt.execute("update " + tablename + " set tmp" + columnname + "= " + columnname);
            //drop original
            stmt.execute("alter table " + tablename + " drop column " + columnname);
            //add col with original name and of varchar type
            stmt.execute("alter table " + tablename + " add column " + columnname + " varchar");
            //update values
            stmt.execute("update " + tablename + " set " + columnname + "= tmp" + columnname);
            //drop tmp
            stmt.execute("alter table " + tablename + " drop column tmp" + columnname);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static void alterTableColumnVarcharToInteger(java.sql.Connection con, String tablename, String columnname) {
        try {
            Statement stmt = con.createStatement();
            // add new tmp varchar col
            stmt.execute("alter table " + tablename + " add column tmp" + columnname + " integer");
            //update value of tmp
            stmt.execute("update " + tablename + " set tmp" + columnname + "= " + columnname);
            //drop original
            stmt.execute("alter table " + tablename + " drop column " + columnname);
            //add col with original name and of varchar type
            stmt.execute("alter table " + tablename + " add column " + columnname + " integer");
            //update values
            stmt.execute("update " + tablename + " set " + columnname + "= tmp" + columnname);
            //drop tmp
            stmt.execute("alter table " + tablename + " drop column tmp" + columnname);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}