需要的公共jar包 mysql-connector-java-5.0.8-bin.jar(mysql数据库) ojdbc14.jar(oracle数据库)
A.DBCP 需要jar包: commons-dbcp.jar,commons-pool.jar 以及 .properties 配置文件(直接放src目录下)
#连接设置
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mysql
username=root
password=root #<!-- 初始化连接 -->
initialSize=10 #最大连接数量
maxActive=50 #<!-- 最大空闲连接 -->
maxIdle=20 #<!-- 最小空闲连接 -->
minIdle=5 #<!-- 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒 -->
maxWait=60000 #JDBC驱动建立连接时附带的连接属性属性的格式必须为这样：[属性名=property;]
#注意："user" 与 "password" 两个属性会被明确地传递，因此这里不需要包含他们。
connectionProperties=useUnicode=true;characterEncoding=utf8 #指定由连接池所创建的连接的自动提交（auto-commit）状态。
defaultAutoCommit=true #driver default 指定由连接池所创建的连接的只读（read-only）状态。
#如果没有设置该值，则“setReadOnly”方法将不被调用。（某些驱动并不支持只读模式，如：Informix）
defaultReadOnly= #driver default 指定由连接池所创建的连接的事务级别（TransactionIsolation）。
#可用值为下列之一：（详情可见javadoc。）NONE,READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE
defaultTransactionIsolation=READ_COMMITTED
package de.bvb.utils; import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; public class JdbcUtils_DBCP { private static DataSource ds = null;
static {
try {
InputStream in = JdbcUtils_DBCP.class.getClassLoader().getResourceAsStream("dbcpconfig.properties");
Properties prop = new Properties();
prop.load(in); ds = BasicDataSourceFactory.createDataSource(prop);
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
} public static Connection getConnection() throws SQLException {
return ds.getConnection();
} public static void release(Connection conn, Statement st, ResultSet rs) { if (rs != null) {
try {
rs.close(); //throw new
} catch (Exception e) {
e.printStackTrace();
}
rs = null;
}
if (st != null) {
try {
st.close();
} catch (Exception e) {
e.printStackTrace();
}
st = null;
}
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
} }
}
B.C3P0 需要jar包: c3p0-0.9.2-pre1.jar,mchange-commons-0.2.jar 以及 c3p0-config.xml 配置文件(直接放src目录下,并且文件名包括后缀名不能修改成别的)
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/mysql</property>
<property name="user">root</property>
<property name="password">root</property> <property name="initialPoolSize">10</property>
<property name="maxIdleTime">30</property>
<property name="maxPoolSize">20</property>
<property name="minPoolSize">5</property>
<property name="maxStatements">200</property>
</default-config> <named-config name="mysql">
<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>
</named-config> <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>
</named-config>
</c3p0-config>
package de.bvb.utils; import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; import com.mchange.v2.c3p0.ComboPooledDataSource; public class JdbcUtils_C3P0 { private static ComboPooledDataSource ds = null;
static {
try {
ds = new ComboPooledDataSource(); //加载xml文件中默认的配置,也就是<default-config>下面的配置
// ds = new ComboPooledDataSource("mysql"); //加载xml文件中的 <named-config name="mysql">下面的配置
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
} public static Connection getConnection() throws SQLException {
return ds.getConnection();
} public static void release(Connection conn, Statement st, ResultSet rs) { if (rs != null) {
try {
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
rs = null;
}
if (st != null) {
try {
st.close();
} catch (Exception e) {
e.printStackTrace();
}
st = null;
}
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
} }
}