alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Spring Framework example source code file (RdbmsOperation.java)

This example Spring Framework source code file (RdbmsOperation.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

cannot, cannot, illegalargumentexception, invaliddataaccessapiusageexception, invaliddataaccessapiusageexception, iterator, jdbc, jdbctemplate, list, sql, sql, sqlparameter, sqlparameter, string, the, the, util

The Spring Framework RdbmsOperation.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.object;

import java.sql.ResultSet;
import java.sql.Types;
import java.util.*;

import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.SqlParameter;

/**
 * An "RDBMS operation" is a multi-threaded, reusable object representing a query,
 * update, or stored procedure call. An RDBMS operation is <b>not a command,
 * as a command is not reusable. However, execute methods may take commands as
 * arguments. Subclasses should be JavaBeans, allowing easy configuration.
 *
 * <p>This class and subclasses throw runtime exceptions, defined in the
 * <codeorg.springframework.dao package package, which the classes
 * in this package use under the hood to perform raw JDBC operations).
 *
 * <p>Subclasses should set SQL and add parameters before invoking the
 * {@link #compile()} method. The order in which parameters are added is
 * significant. The appropriate <code>execute or update
 * method can then be invoked.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see SqlQuery
 * @see SqlUpdate
 * @see StoredProcedure
 * @see org.springframework.jdbc.core.JdbcTemplate
 */
public abstract class RdbmsOperation implements InitializingBean {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	/** Lower-level class used to execute SQL */
	private JdbcTemplate jdbcTemplate = new JdbcTemplate();

	private int resultSetType = ResultSet.TYPE_FORWARD_ONLY;

	private boolean updatableResults = false;

	private boolean returnGeneratedKeys = false;
	
	private String[] generatedKeysColumnNames = null;

	/** SQL statement */
	private String sql;

	/** List of SqlParameter objects */
	private final List declaredParameters = new LinkedList();

	/**
	 * Has this operation been compiled? Compilation means at
	 * least checking that a DataSource and sql have been provided,
	 * but subclasses may also implement their own custom validation.
	 */
	private boolean compiled;
	
	
	/**
	 * An alternative to the more commonly used setDataSource() when you want to
	 * use the same JdbcTemplate in multiple RdbmsOperations. This is appropriate if the
	 * JdbcTemplate has special configuration such as a SQLExceptionTranslator that should
	 * apply to multiple RdbmsOperation objects.
	 */
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		if (jdbcTemplate == null) {
			throw new IllegalArgumentException("jdbcTemplate must not be null");
		}
		this.jdbcTemplate = jdbcTemplate;
	}

	/**
	 * Return the JdbcTemplate object used by this object.
	 */
	public JdbcTemplate getJdbcTemplate() {
		return this.jdbcTemplate;
	}

	/**
	 * Set the JDBC DataSource to obtain connections from.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setDataSource
	 */
	public void setDataSource(DataSource dataSource) {
		this.jdbcTemplate.setDataSource(dataSource);
	}

	/**
	 * Set the fetch size for this RDBMS operation. This is important for processing
	 * large result sets: Setting this higher than the default value will increase
	 * processing speed at the cost of memory consumption; setting this lower can
	 * avoid transferring row data that will never be read by the application.
	 * <p>Default is 0, indicating to use the driver's default.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setFetchSize
	 */
	public void setFetchSize(int fetchSize) {
		this.jdbcTemplate.setFetchSize(fetchSize);
	}

	/**
	 * Set the maximum number of rows for this RDBMS operation. This is important
	 * for processing subsets of large result sets, avoiding to read and hold
	 * the entire result set in the database or in the JDBC driver.
	 * <p>Default is 0, indicating to use the driver's default.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setMaxRows
	 */
	public void setMaxRows(int maxRows) {
		this.jdbcTemplate.setMaxRows(maxRows);
	}

	/**
	 * Set the query timeout for statements that this RDBMS operation executes.
	 * <p>Default is 0, indicating to use the JDBC driver's default.
	 * <p>Note: Any timeout specified here will be overridden by the remaining
	 * transaction timeout when executing within a transaction that has a
	 * timeout specified at the transaction level.
	 */
	public void setQueryTimeout(int queryTimeout) {
		this.jdbcTemplate.setQueryTimeout(queryTimeout);
	}

	/**
	 * Set whether to use statements that return a specific type of ResultSet.
	 * @param resultSetType the ResultSet type
	 * @see java.sql.ResultSet#TYPE_FORWARD_ONLY
	 * @see java.sql.ResultSet#TYPE_SCROLL_INSENSITIVE
	 * @see java.sql.ResultSet#TYPE_SCROLL_SENSITIVE
	 * @see java.sql.Connection#prepareStatement(String, int, int)
	 */
	public void setResultSetType(int resultSetType) {
		this.resultSetType = resultSetType;
	}

	/**
	 * Return whether statements will return a specific type of ResultSet.
	 */
	public int getResultSetType() {
		return this.resultSetType;
	}

	/**
	 * Set whether to use statements that are capable of returning
	 * updatable ResultSets.
	 * @see java.sql.Connection#prepareStatement(String, int, int)
	 */
	public void setUpdatableResults(boolean updatableResults) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The updateableResults flag must be set before the operation is compiled");
		}
		this.updatableResults = updatableResults;
	}

	/**
	 * Return whether statements will return updatable ResultSets.
	 */
	public boolean isUpdatableResults() {
		return this.updatableResults;
	}

	/**
	 * Set whether prepared statements should be capable of returning
	 * auto-generated keys.
	 * @see java.sql.Connection#prepareStatement(String, int)
	 */
	public void setReturnGeneratedKeys(boolean returnGeneratedKeys) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The returnGeneratedKeys flag must be set before the operation is compiled");
		}
		this.returnGeneratedKeys = returnGeneratedKeys;
	}

	/**
	 * Return whether statements should be capable of returning
	 * auto-generated keys.
	 */
	public boolean isReturnGeneratedKeys() {
		return this.returnGeneratedKeys;
	}

	/**
	 * Set the column names of the auto-generated keys.
	 * @see java.sql.Connection#prepareStatement(String, String[])
	 */
	public void setGeneratedKeysColumnNames(String[] names) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The column names for the generated keys must be set before the operation is compiled");
		}
		this.generatedKeysColumnNames = names;
	}

	/**
	 * Return the column names of the auto generated keys.
	 */
	public String[] getGeneratedKeysColumnNames() {
		return this.generatedKeysColumnNames;
	}

	/**
	 * Set the SQL executed by this operation.
	 */
	public void setSql(String sql) {
		this.sql = sql;
	}

	/**
	 * Subclasses can override this to supply dynamic SQL if they wish,
	 * but SQL is normally set by calling the setSql() method
	 * or in a subclass constructor.
	 */
	public String getSql() {
		return this.sql;
	}

	/**
	 * Add anonymous parameters, specifying only their SQL types
	 * as defined in the <code>java.sql.Types class.
	 * <p>Parameter ordering is significant. This method is an alternative
	 * to the {@link #declareParameter} method, which should normally be preferred.
	 * @param types array of SQL types as defined in the
	 * <code>java.sql.Types class
	 * @throws InvalidDataAccessApiUsageException if the operation is already compiled
	 */
	public void setTypes(int[] types) throws InvalidDataAccessApiUsageException {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once query is compiled");
		}
		if (types != null) {
			for (int i = 0; i < types.length; i++) {
				declareParameter(new SqlParameter(types[i]));
			}
		}
	}

	/**
	 * Declare a parameter for this operation.
	 * <p>The order in which this method is called is significant when using
	 * positional parameters. It is not significant when using named parameters
	 * with named SqlParameter objects here; it remains significant when using
	 * named parameters in combination with unnamed SqlParameter objects here.
	 * @param param the SqlParameter to add. This will specify SQL type and (optionally)
	 * the parameter's name. Note that you typically use the {@link SqlParameter} class
	 * itself here, not any of its subclasses.
	 * @throws InvalidDataAccessApiUsageException if the operation is already compiled,
	 * and hence cannot be configured further
	 */
	public void declareParameter(SqlParameter param) throws InvalidDataAccessApiUsageException {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once the query is compiled");
		}
		this.declaredParameters.add(param);
	}

	/**
	 * Add one or more declared parameters. Used for configuring this operation 
	 * when used in a bean factory.  Each parameter will specify SQL type and (optionally)
	 * the parameter's name.
	 * @param parameters Array containing the declared {@link SqlParameter} objects
	 * @see #declaredParameters
	 */
	public void setParameters(SqlParameter[] parameters) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once the query is compiled");
		}
		for (int i = 0; i < parameters.length; i++) {
			if (parameters[i] != null) {
				this.declaredParameters.add(parameters[i]);
			}
			else {
				throw new InvalidDataAccessApiUsageException("Cannot add parameter at index " + i + " from " +
						Arrays.asList(parameters) + " since it is 'null'");
			}
		}
	}

	/**
	 * Return a list of the declared {@link SqlParameter} objects.
	 */
	protected List getDeclaredParameters() {
		return this.declaredParameters;
	}


	/**
	 * Ensures compilation if used in a bean factory.
	 */
	public void afterPropertiesSet() {
		compile();
	}

	/**
	 * Compile this query.
	 * Ignores subsequent attempts to compile.
	 * @throws InvalidDataAccessApiUsageException if the object hasn't
	 * been correctly initialized, for example if no DataSource has been provided
	 */
	public final void compile() throws InvalidDataAccessApiUsageException {
		if (!isCompiled()) {
			if (getSql() == null) {
				throw new InvalidDataAccessApiUsageException("Property 'sql' is required");
			}

			try {
				this.jdbcTemplate.afterPropertiesSet();
			}
			catch (IllegalArgumentException ex) {
				throw new InvalidDataAccessApiUsageException(ex.getMessage());
			}	
		
			compileInternal();
			this.compiled = true;

			if (logger.isDebugEnabled()) {
				logger.debug("RdbmsOperation with SQL [" + getSql() + "] compiled");
			}
		}
	}

	/**
	 * Is this operation "compiled"? Compilation, as in JDO,
	 * means that the operation is fully configured, and ready to use.
	 * The exact meaning of compilation will vary between subclasses.
	 * @return whether this operation is compiled, and ready to use.
	 */
	public boolean isCompiled() {
		return this.compiled;
	}

	/**
	 * Check whether this operation has been compiled already;
	 * lazily compile it if not already compiled.
	 * <p>Automatically called by validateParameters.
	 * @see #validateParameters
	 */
	protected void checkCompiled() {
		if (!isCompiled()) {
			logger.debug("SQL operation not compiled before execution - invoking compile");
			compile();
		}
	}

	/**
	 * Validate the parameters passed to an execute method based on declared parameters.
	 * Subclasses should invoke this method before every <code>executeQuery()
	 * or <code>update() method.
	 * @param parameters parameters supplied (may be <code>null)
	 * @throws InvalidDataAccessApiUsageException if the parameters are invalid
	 */
	protected void validateParameters(Object[] parameters) throws InvalidDataAccessApiUsageException {
		checkCompiled();

		int declaredInParameters = 0;
		Iterator it = this.declaredParameters.iterator();
		while (it.hasNext()) {
			SqlParameter param = (SqlParameter) it.next();
			if (param.isInputValueProvided()) {
				if (!supportsLobParameters() &&
						(param.getSqlType() == Types.BLOB || param.getSqlType() == Types.CLOB)) {
					throw new InvalidDataAccessApiUsageException(
							"BLOB or CLOB parameters are not allowed for this kind of operation");
				}
				declaredInParameters++;
			}
		}

		validateParameterCount((parameters != null ? parameters.length : 0), declaredInParameters);
	}

	/**
	 * Validate the named parameters passed to an execute method based on declared parameters.
	 * Subclasses should invoke this method before every <code>executeQuery() or
	 * <code>update() method.
	 * @param parameters parameter Map supplied. May be <code>null.
	 * @throws InvalidDataAccessApiUsageException if the parameters are invalid
	 */
	protected void validateNamedParameters(Map parameters) throws InvalidDataAccessApiUsageException {
		checkCompiled();
		Map paramsToUse = (parameters != null ? parameters : Collections.EMPTY_MAP);

		int declaredInParameters = 0;
		Iterator it = this.declaredParameters.iterator();
		while (it.hasNext()) {
			SqlParameter param = (SqlParameter) it.next();
			if (param.isInputValueProvided()) {
				if (!supportsLobParameters() &&
						(param.getSqlType() == Types.BLOB || param.getSqlType() == Types.CLOB)) {
					throw new InvalidDataAccessApiUsageException(
							"BLOB or CLOB parameters are not allowed for this kind of operation");
				}
				if (param.getName() != null && !paramsToUse.containsKey(param.getName())) {
					throw new InvalidDataAccessApiUsageException("The parameter named '" + param.getName() +
							"' was not among the parameters supplied: " + paramsToUse.keySet());
				}
				declaredInParameters++;
			}
		}

		validateParameterCount(paramsToUse.size(), declaredInParameters);
	}

	/**
	 * Validate the given parameter count against the given declared parameters.
	 * @param suppliedParamCount the number of actual parameters given
	 * @param declaredInParamCount the number of input parameters declared
	 */
	private void validateParameterCount(int suppliedParamCount, int declaredInParamCount) {
		if (suppliedParamCount < declaredInParamCount) {
			throw new InvalidDataAccessApiUsageException(suppliedParamCount + " parameters were supplied, but " +
					declaredInParamCount + " in parameters were declared in class [" + getClass().getName() + "]");
		}
		if (suppliedParamCount > this.declaredParameters.size() && !allowsUnusedParameters()) {
			throw new InvalidDataAccessApiUsageException(suppliedParamCount + " parameters were supplied, but " +
					declaredInParamCount + " parameters were declared in class [" + getClass().getName() + "]");
		}
	}


	/**
	 * Subclasses must implement this template method to perform their own compilation.
	 * Invoked after this base class's compilation is complete.
	 * <p>Subclasses can assume that SQL and a DataSource have been supplied.
	 * @throws InvalidDataAccessApiUsageException if the subclass hasn't been
	 * properly configured
	 */
	protected abstract void compileInternal() throws InvalidDataAccessApiUsageException;

	/**
	 * Return whether BLOB/CLOB parameters are supported for this kind of operation.
	 * <p>The default is true.
	 */
	protected boolean supportsLobParameters() {
		return true;
	}

	/**
	 * Return whether this operation accepts additional parameters that are
	 * given but not actually used. Applies in particular to parameter Maps.
	 * <p>The default is false.
	 * @see StoredProcedure
	 */
	protected boolean allowsUnusedParameters() {
		return false;
	}

}

Other Spring Framework examples (source code examples)

Here is a short list of links related to this Spring Framework RdbmsOperation.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.