先導入c3p0 jar包
C3P0Util.java放入util包下
c3p0-config.xml放入src目錄下
c3p0-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/1713_day14</property>
<property name="user">root</property>
<property name="password">123456</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>
</c3p0-config>
C3P0Util.java
public class C3P0Util {
/**
* ComboPooledDataSource存儲數據源接口池
* 獲取dateSource即數據源,可從中獲取數據庫的鏈接
* c3p0被稱爲數據庫鏈接池,用來管理數據庫鏈接的獲取和存儲
*/
private static ComboPooledDataSource dataSource=new ComboPooledDataSource();
public static ComboPooledDataSource getDataSource(){
return dataSource;
}
public static Connection getConnection(){
try {
return dataSource.getConnection();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("獲取不到連接");
}
}
/**
* ResultSet:數據庫結果集的數據表,通常通過執行查詢數據庫的語句生成
* Statement:用於在已經建立數據庫連接的基礎上,向數據庫發送要執行的SQL語句
* Connection:代表與特定的數據庫的連接.要對數據表中的數據進行操作,首先要獲取數據庫連接
* @param rs
* @param stat
* @param conn
*/
public static void release(ResultSet rs,Statement stat,Connection conn){
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}
if (stat!=null) {
try {
stat.close();
} catch (SQLException e) {
e.printStackTrace();
}
stat=null;
}
if (conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}