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annotate example/PreparedExample.java @ 973:32f246853ec4 default tip

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Optimisation, call connection.mapClobAsVarChar() and connection.mapBlobAsVarBinary() outside the for-loop, as it does not change.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 10 Apr 2025 19:26:59 +0200 (8 days ago)
parents d416e9b6b3d0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * SPDX-License-Identifier: MPL-2.0
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 *
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8 * Copyright 2024, 2025 MonetDB Foundation;
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9 * Copyright August 2008 - 2023 MonetDB B.V.;
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10 * Copyright 1997 - July 2008 CWI.
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11 */
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12
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13 import java.sql.*;
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14
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15 /**
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16 * This example shows the use of the PreparedStatement
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17 *
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18 * @author Fabian Groffen
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19 */
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20 public class PreparedExample {
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21 public static void main(String[] args) throws Exception {
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22 Connection con = DriverManager.getConnection("jdbc:monetdb://localhost/notused", "monetdb", "monetdb");
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23 PreparedStatement st = con.prepareStatement("SELECT ? AS a1, ? AS a2");
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24 ResultSet rs;
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25
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26 st.setString(1, "te\\s't");
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27 st.setInt(2, 10);
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28
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29 rs = st.executeQuery();
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30 // get meta data and print columns with their type
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31 ResultSetMetaData md = rs.getMetaData();
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32 for (int i = 1; i <= md.getColumnCount(); i++) {
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33 System.out.print(md.getColumnName(i) + ":" +
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34 md.getColumnTypeName(i) + "\t");
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35 }
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36 System.out.println("");
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37
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38 while (rs.next()) {
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39 for (int j = 1; j <= md.getColumnCount(); j++) {
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40 System.out.print(rs.getString(j) + "\t");
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41 }
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42 System.out.println("");
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43 }
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44 rs.close();
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45
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46 con.close();
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47 }
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48 }