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要将 DBCP 与 Hibernate 集成，您需要commons-dbcp.jar和commons-pool-1.5.4.jar。
文件：pom.xml
<project ...> <repositories> <repository> <id>JBoss repository</id> <url>http://repository.jboss.org/nexus/content/groups/public/</url> </repository> </repositories> <dependencies> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>3.6.3.Final</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> </dependencies></project>
要将 DBCP 与 Hibernate 集成，您需要创建一个“ DBCPConnectionProvider ”类。
文件：DBCPConnectionProvider.java
package com.mkyong.util;import java.io.PrintWriter;import java.io.StringWriter;import java.sql.Connection;import java.sql.SQLException;import java.util.Iterator;import java.util.Map;import java.util.Properties;import org.apache.commons.dbcp.BasicDataSource;import org.apache.commons.dbcp.BasicDataSourceFactory;import org.hibernate.HibernateException;import org.hibernate.cfg.Environment;import org.hibernate.connection.ConnectionProvider;import org.hibernate.connection.ConnectionProviderFactory;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class DBCPConnectionProvider implements ConnectionProvider { private static final Logger log = LoggerFactory
.getLogger(DBCPConnectionProvider.class); private static final String PREFIX = "hibernate.dbcp."; private BasicDataSource ds; // Old Environment property for backward-compatibility (property removed in
// Hibernate3)
private static final String DBCP_PS_MAXACTIVE = "hibernate.dbcp.ps.maxActive"; // Property doesn't exists in Hibernate2
private static final String AUTOCOMMIT = "hibernate.connection.autocommit"; public void configure(Properties props) throws HibernateException { try {
log.debug("Configure DBCPConnectionProvider"); // DBCP properties used to create the BasicDataSource
Properties dbcpProperties = new Properties(); // DriverClass & url
String jdbcDriverClass = props.getProperty(Environment.DRIVER);
String jdbcUrl = props.getProperty(Environment.URL);
dbcpProperties.put("driverClassName", jdbcDriverClass);
dbcpProperties.put("url", jdbcUrl); // Username / password
String username = props.getProperty(Environment.USER);
String password = props.getProperty(Environment.PASS);
dbcpProperties.put("username", username);
dbcpProperties.put("password", password); // Isolation level
String isolationLevel = props.getProperty(Environment.ISOLATION); if ((isolationLevel != null)
&& (isolationLevel.trim().length() > 0)) {
dbcpProperties.put("defaultTransactionIsolation",
isolationLevel);
} // Turn off autocommit (unless autocommit property is set)
String autocommit = props.getProperty(AUTOCOMMIT); if ((autocommit != null) && (autocommit.trim().length() > 0)) {
dbcpProperties.put("defaultAutoCommit", autocommit);
} else {
dbcpProperties.put("defaultAutoCommit",
String.valueOf(Boolean.FALSE));
} // Pool size
String poolSize = props.getProperty(Environment.POOL_SIZE); if ((poolSize != null) && (poolSize.trim().length() > 0)
&& (Integer.parseInt(poolSize) > 0)) {
dbcpProperties.put("maxActive", poolSize);
} // Copy all "driver" properties into "connectionProperties"
Properties driverProps = ConnectionProviderFactory
.getConnectionProperties(props); if (driverProps.size() > 0) {
StringBuffer connectionProperties = new StringBuffer(); for (Iterator iter = driverProps.entrySet().iterator(); iter
.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
String key = (String) entry.getKey();
String value = (String) entry.getValue();
connectionProperties.append(key).append('=').append(value); if (iter.hasNext()) {
connectionProperties.append(';');
}
}
dbcpProperties.put("connectionProperties",
connectionProperties.toString());
} // Copy all DBCP properties removing the prefix
for (Iterator iter = props.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
String key = (String) entry.getKey(); if (key.startsWith(PREFIX)) {
String property = key.substring(PREFIX.length());
String value = (String) entry.getValue();
dbcpProperties.put(property, value);
}
} // Backward-compatibility
if (props.getProperty(DBCP_PS_MAXACTIVE) != null) {
dbcpProperties.put("poolPreparedStatements",
String.valueOf(Boolean.TRUE));
dbcpProperties.put("maxOpenPreparedStatements",
props.getProperty(DBCP_PS_MAXACTIVE));
} // Some debug info
if (log.isDebugEnabled()) {
StringWriter sw = new StringWriter();
dbcpProperties.list(new PrintWriter(sw, true));
log.debug(sw.toString());
} // Let the factory create the pool
ds = (BasicDataSource) BasicDataSourceFactory
.createDataSource(dbcpProperties); // The BasicDataSource has lazy initialization
// borrowing a connection will start the DataSource
// and make sure it is configured correctly.
Connection conn = ds.getConnection();
conn.close(); // Log pool statistics before continuing.
logStatistics();
} catch (Exception e) {
String message = "Could not create a DBCP pool";
log.error(message, e); if (ds != null) { try {
ds.close();
} catch (Exception e2) { // ignore
}
ds = null;
} throw new HibernateException(message, e);
}
log.debug("Configure DBCPConnectionProvider complete");
} public Connection getConnection() throws SQLException {
Connection conn = null; try {
conn = ds.getConnection();
} finally {
logStatistics();
} return conn;
} public void closeConnection(Connection conn) throws SQLException { try {
conn.close();
} finally {
logStatistics();
}
} public void close() throws HibernateException {
log.debug("Close DBCPConnectionProvider");
logStatistics(); try { if (ds != null) {
ds.close();
ds = null;
} else {
log.warn("Cannot close DBCP pool (not initialized)");
}
} catch (Exception e) { throw new HibernateException("Could not close DBCP pool", e);
}
log.debug("Close DBCPConnectionProvider complete");
} protected void logStatistics() { if (log.isInfoEnabled()) {
log.info("active: " + ds.getNumActive() + " (max: "
+ ds.getMaxActive() + ") " + "idle: " + ds.getNumIdle()
+ "(max: " + ds.getMaxIdle() + ")");
}
} public boolean supportsAggressiveRelease() { return false;
}
}现在，链接您的“ DBCPConnectionProvider ”并在“ hibernate.cfg.xml ”中定义 DBCP 属性，例如：
文件：hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:MKYONG</property> <property name="hibernate.connection.username">mkyong</property> <property name="hibernate.connection.password">password</property> <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property> <property name="hibernate.default_schema">MKYONG</property> <property name="show_sql">true</property> <property name="hibernate.connection.provider_class"> com.mkyong.util.DBCPConnectionProvider </property> <property name="hibernate.dbcp.initialSize">8</property> <property name="hibernate.dbcp.maxActive">20</property> <property name="hibernate.dbcp.maxIdle">20</property> <property name="hibernate.dbcp.minIdle">0</property> <mapping class="com.mkyong.user.DBUser"></mapping></session-factory></hibernate-configuration>
完成，运行它并查看以下输出：
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