本篇文章给大家分享的是有关ibatis中怎么加入c3p0连接池，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。

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首先打开iBatis的源码包，找到com.ibatis.sqlmap.engine.datasource包，在里面新建个类，C3p0DataSourceFactory，并实现DataSourceFactory接口，里面的代码是Java代码
private DataSource dataSource;  

public DataSource getDataSource() {  
return dataSource;  
}  

public void initialize(Map map) {  
C3p0Configuration c3p0 = new C3p0Configuration(map);  
dataSource = c3p0.getDataSource();  
} 

private DataSource dataSource;

public DataSource getDataSource() {
return dataSource;
}

public void initialize(Map map) {
C3p0Configuration c3p0 = new C3p0Configuration(map);
dataSource = c3p0.getDataSource();
}

在ibatis下加入c3p0连接池的下一步是到com.ibatis.common.jdbc包里，新建类C3p0Configuration，里面的代码是。。。太长了，原来在dbcp那部分里，还有单独加载配置文件的方法，我觉得如果连这个xml都读不了，那别的一样没法读。
Java代码
private static final Probe PROBE = ProbeFactory.getProbe();  
private DataSource dataSource;  

/** 
* Constructor to supply a map of properties 
*  
* @param properties 
*            - the map of configuration properties 
*/ 
public C3p0Configuration(Map properties) {  
try {  
dataSource = legacyC3p0Configuration(properties);  
} catch (Exception e) {  
throw new RuntimeException(  
"Error initializing C3p0DataSourceFactory.  Cause: " + e, e);  
}  
}  

/** 
* Getter for DataSource 
*  
* @return The DataSource 
*/ 
public DataSource getDataSource() {  
return dataSource;  
}  

private boolean notEmpty(String s) {  
return s != null && s.length() > 0;  
}  

private boolean notSelfString(String s, String compareStr) {  
return !s.equalsIgnoreCase(compareStr);  
}  

private DataSource legacyC3p0Configuration(Map map) {  

ComboPooledDataSource combo = null;  

try {  
if (map.containsKey("JDBC.Driver")) {  

combo = new ComboPooledDataSource();  

String driverClass = (String) map.get("JDBC.Driver");  
String jdbcUrl = (String) map.get("JDBC.ConnectionURL");  
String user = (String) map.get("JDBC.Username");  
String password = (String) map.get("JDBC.Password");  

Class.forName(driverClass);  
combo.setDriverClass(driverClass);  
combo.setJdbcUrl(jdbcUrl);  
combo.setUser(user);  
combo.setPassword(password);  

String acquireIncrement = (String) map  
.get("Pool.acquireIncrement");  
if (notEmpty(acquireIncrement)  
&& notSelfString(acquireIncrement, "acquireIncrement"))  
combo.setAcquireIncrement(Integer  
.parseInt(acquireIncrement));  

...................... 

private static final Probe PROBE = ProbeFactory.getProbe();
private DataSource dataSource;

/**
* Constructor to supply a map of properties
*
* @param properties
*            - the map of configuration properties
*/
public C3p0Configuration(Map properties) {
try {
dataSource = legacyC3p0Configuration(properties);
} catch (Exception e) {
throw new RuntimeException(
"Error initializing C3p0DataSourceFactory.  Cause: " + e, e);
}
}

/**
* Getter for DataSource
*
* @return The DataSource
*/
public DataSource getDataSource() {
return dataSource;
}

private boolean notEmpty(String s) {
return s != null && s.length() > 0;
}

private boolean notSelfString(String s, String compareStr) {
return !s.equalsIgnoreCase(compareStr);
}

private DataSource legacyC3p0Configuration(Map map) {

ComboPooledDataSource combo = null;

try {
if (map.containsKey("JDBC.Driver")) {

combo = new ComboPooledDataSource();

String driverClass = (String) map.get("JDBC.Driver");
String jdbcUrl = (String) map.get("JDBC.ConnectionURL");
String user = (String) map.get("JDBC.Username");
String password = (String) map.get("JDBC.Password");

Class.forName(driverClass);
combo.setDriverClass(driverClass);
combo.setJdbcUrl(jdbcUrl);
combo.setUser(user);
combo.setPassword(password);

String acquireIncrement = (String) map
.get("Pool.acquireIncrement");
if (notEmpty(acquireIncrement)
&& notSelfString(acquireIncrement, "acquireIncrement"))
combo.setAcquireIncrement(Integer
.parseInt(acquireIncrement));

......................

***在com.ibatis.sqlmap.engine.config包里，找到SqlMapConfiguration，在里面找到，加上C3P0就可以实现在ibatis下加入c3p0连接池了
Java代码
// DATA SOURCE ALIASES  
typeHandlerFactory.putTypeAlias("SIMPLE", SimpleDataSourceFactory.class.getName());  
typeHandlerFactory.putTypeAlias("DBCP", DbcpDataSourceFactory.class.getName());  
typeHandlerFactory.putTypeAlias("C3P0", C3p0DataSourceFactory.class.getName());  
typeHandlerFactory.putTypeAlias("JNDI", JndiDataSourceFactory.class.getName());

以上就是ibatis中怎么加入c3p0连接池，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。

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