第一种方式,无配置
public static void main(String[] args) {
Connection conn = null;
PreparedStatement pstm = null;
ResultSet rs = null;
try {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("oracle.jdbc.OracleDriver");
dataSource.setJdbcUrl("jdbc:oracle:thin:@172.18.9.24:1521:orcl");
dataSource.setUser("scott");
dataSource.setPassword("tiger");
conn = dataSource.getConnection();
String sql = "select * from emp20";
pstm = conn.prepareStatement(sql);
rs = pstm.executeQuery();
while(rs.next()){
System.out.println(rs.getString("ename"));
}
} catch (Exception e) {
e.printStackTrace();
}finally {
//释放资源
}
}
第二种方式,配置实现
public static void main(String[] args) {
Connection conn = null;
PreparedStatement pstm = null;
ResultSet rs = null;
try {
//默认加载c3p0-config.xml (类加载路径)
ComboPooledDataSource dataSource = new ComboPooledDataSource();
conn = dataSource.getConnection();
String sql = "select * from emp20";
pstm = conn.prepareStatement(sql);
rs = pstm.executeQuery();
while(rs.next()){
System.out.println(rs.getString("ename"));
}
} catch (Exception e) {
e.printStackTrace();
}finally {
//释放资源
}
}
默认加载类路径下的配置文件c3p0-config.xml,
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<!-- default-config 默认的配置, -->
<default-config>
<property name="driverClass">oracle.jdbc.OracleDriver</property>
<property name="jdbcUrl">jdbc:oracle:thin:@172.18.9.24:1521:orcl</property>
<property name="user">scott</property>
<property name="password">tiger</property>
<property name="initialPoolSize">10</property>
<property name="maxIdleTime">30</property>
<property name="maxPoolSize">100</property>
<property name="minPoolSize">10</property>
<property name="maxStatements">200</property>
</default-config>
<!-- This app is massive! -->
<named-config name="oracle">
<property name="acquireIncrement">50</property>
<property name="initialPoolSize">100</property>
<property name="minPoolSize">50</property>
<property name="maxPoolSize">1000</property>
<!-- intergalactoApp adopts a different approach to configuring statement caching -->
<property name="maxStatements">0</property>
<property name="maxStatementsPerConnection">5</property>
<!-- he's important, but there's only one of him -->
<user-overrides user="master-of-the-universe">
<property name="acquireIncrement">1</property>
<property name="initialPoolSize">1</property>
<property name="minPoolSize">1</property>
<property name="maxPoolSize">5</property>
<property name="maxStatementsPerConnection">50</property>
</user-overrides>
</named-config>
</c3p0-config>