ramblings/oxygen/js-require/src-java/simple/documentation/framework/operations/QueryDatabaseOperation.java

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2021-05-01 16:48:45 +00:00
package simple.documentation.framework.operations;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Properties;
import ro.sync.ecss.extensions.api.ArgumentDescriptor;
import ro.sync.ecss.extensions.api.ArgumentsMap;
import ro.sync.ecss.extensions.api.AuthorAccess;
import ro.sync.ecss.extensions.api.AuthorOperation;
import ro.sync.ecss.extensions.api.AuthorOperationException;
/**
* Query DB operation.
*/
public class QueryDatabaseOperation implements AuthorOperation{
private static String ARG_JDBC_DRIVER ="jdbc_driver";
private static String ARG_USER ="user";
private static String ARG_PASSWORD ="password";
private static String ARG_SQL ="sql";
private static String ARG_CONNECTION ="connection";
/**
* @return The array of arguments the developer must specify when
* configuring the action.
*/
public ArgumentDescriptor[] getArguments() {
ArgumentDescriptor args[] = new ArgumentDescriptor[] {
new ArgumentDescriptor(
ARG_JDBC_DRIVER,
ArgumentDescriptor.TYPE_STRING,
"The name of the Java class that is the JDBC driver."),
new ArgumentDescriptor(
ARG_CONNECTION,
ArgumentDescriptor.TYPE_STRING,
"The database URL connection string."),
new ArgumentDescriptor(
ARG_USER,
ArgumentDescriptor.TYPE_STRING,
"The name of the database user."),
new ArgumentDescriptor(
ARG_PASSWORD,
ArgumentDescriptor.TYPE_STRING,
"The database password."),
new ArgumentDescriptor(
ARG_SQL,
ArgumentDescriptor.TYPE_STRING,
"The SQL statement to be executed.")
};
return args;
}
/**
* @return The operation description.
*/
public String getDescription() {
return "Executes a database query and puts the result in a table.";
}
public void doOperation(AuthorAccess authorAccess, ArgumentsMap map)
throws IllegalArgumentException, AuthorOperationException {
// Collects the arguments.
String jdbcDriver =
(String)map.getArgumentValue(ARG_JDBC_DRIVER);
String connection =
(String)map.getArgumentValue(ARG_CONNECTION);
String user =
(String)map.getArgumentValue(ARG_USER);
String password =
(String)map.getArgumentValue(ARG_PASSWORD);
String sql =
(String)map.getArgumentValue(ARG_SQL);
int caretPosition = authorAccess.getEditorAccess().getCaretOffset();
try {
if (jdbcDriver == null) {
throw new AuthorOperationException("No jdbc driver provided.");
}
if (connection == null) {
throw new AuthorOperationException("No connection provided.");
}
if (user == null) {
throw new AuthorOperationException("No user provided.");
}
if (sql == null) {
throw new AuthorOperationException("No sql provided.");
}
authorAccess.getDocumentController().insertXMLFragment(
getFragment(jdbcDriver, connection, user, password, sql),
caretPosition);
} catch (SQLException e) {
throw new AuthorOperationException(
"The operation failed due to the following database error: " +
e.getMessage(), e);
} catch (ClassNotFoundException e) {
throw new AuthorOperationException(
"The JDBC database driver was not found. Tried to load ' " +
jdbcDriver + "'", e);
}
}
/**
* Creates a connection to the database, executes
* the SQL statement and creates an XML fragment
* containing a table element that wraps the data
* from the result set.
*
*
* @param jdbcDriver The class name of the JDBC driver.
* @param connectionURL The connection URL.
* @param user The database user.
* @param password The password.
* @param sql The SQL statement.
* @return The string containing the XML fragment.
*
* @throws SQLException thrown when there is a
* problem accessing the database or there are
* erors in the SQL expression.
* @throws ClassNotFoundException when the JDBC
* driver class could not be loaded.
*/
private String getFragment(
String jdbcDriver,
String connectionURL,
String user,
String password,
String sql) throws
SQLException,
ClassNotFoundException {
Properties pr = new Properties();
pr.put("characterEncoding", "UTF8");
pr.put("useUnicode", "TRUE");
pr.put("user", user);
pr.put("password", password);
// Loads the database driver.
Class.forName(jdbcDriver);
// Opens the connection
Connection connection =
DriverManager.getConnection(connectionURL, pr);
java.sql.Statement statement =
connection.createStatement();
ResultSet resultSet =
statement.executeQuery(sql);
StringBuffer fragmentBuffer = new StringBuffer();
fragmentBuffer.append(
"<table xmlns='http://www.oxygenxml.com/sample/documentation'>");
//
// Creates the table header.
//
fragmentBuffer.append("<header>");
ResultSetMetaData metaData = resultSet.getMetaData();
int columnCount = metaData.getColumnCount();
for (int i = 1; i <= columnCount; i++) {
fragmentBuffer.append("<td>");
fragmentBuffer.append(
xmlEscape(metaData.getColumnName(i)));
fragmentBuffer.append("</td>");
}
fragmentBuffer.append("</header>");
//
// Creates the table content.
//
while (resultSet.next()) {
fragmentBuffer.append("<tr>");
for (int i = 1; i <= columnCount; i++) {
fragmentBuffer.append("<td>");
fragmentBuffer.append(
xmlEscape(resultSet.getObject(i)));
fragmentBuffer.append("</td>");
}
fragmentBuffer.append("</tr>");
}
fragmentBuffer.append("</table>");
// Cleanup
resultSet.close();
statement.close();
connection.close();
return fragmentBuffer.toString();
}
/**
* Some of the values from the database table
* may contain characters that must be escaped
* in XML, to ensure the fragment is well formed.
*
* @param object The object from the database.
* @return The escaped string representation.
*/
private String xmlEscape(Object object) {
String str = String.valueOf(object);
return str.
replaceAll("&", "&amp;").
replaceAll("<", "&lt;");
}
}