2. 程式人生 > >Spring的DAO模組資料庫操作例項

Spring的DAO模組資料庫操作例項

阿新 • • 發佈：2019-02-10

Spring的DAO模組提供了對了JDBC、Hibernate、JDO等DAO層支援。DAO模組依賴於
這裡寫圖片描述，MyEclipse自帶的Spring DAO類庫沒有這兩個類庫，需要自己新增。
下面以儲存實體Person為例作介紹：
傳統的JDBC程式設計，總免不了與Connection、Statement、PreparedStatement、ResultSet、SQLException等打交道，還要注意開啟連線後要釋放連線等瑣碎的問題。
Spring框架對JDBC進行了封裝，完全拋棄了JDBC API。資料庫連線、事務等也交給了Spring打點，開發者只需要使用封裝好的JdbcTemplate執行SQL語句，然後得到需要的結果。

實體類Person:

本類的POJO實體類為Person類。本例將使用Spring提供的JdbcTemplate將Person持久化到資料庫中，或者將Person從資料庫中讀取出來。Person類的程式碼如下：
這裡寫圖片描述
Person.java

package com.helloweenvsfei.spring.dao;

import java.util.Date;

public class Person {
    private Integer id;
    private String name;
    private String sex;
    private int
 
 age;
    private Date birthday;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex
 
() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}

DAO層介面

DAO層介面定義了操作Person實體類的方法。IPerson介面定義了4個方法：
這裡寫圖片描述
分別查詢某人員姓名、新增某人員資訊、查詢記錄數、獲取所有人員資訊等。
IPersonDao介面程式碼沒有與Spring的DAO模組耦合。程式碼如下：
IPersonDao.java

package com.helloweenvsfei.spring.dao;

import java.util.List;

public interface IPersonDao {
    public String getPersonName(Integer id);
    public void addPerson(Person person);
    public int getPersonCount();
    public List<Person> listPersons();
}

繼承JdbcDaoSupport
JdbcDaoSupport類來自於這裡寫圖片描述。PersonDaoImpl實現了介面IPersonDao介面，並繼承Spring的DAO模組中的JdbcDaoSupport類。JdbcDaoSupport提供JdbcTemplate物件，封裝了常用的JDBC操作。PersonDaoImpl中還定義了一個初始化方法，用於初始化表結構（如果不存在則建立）。
由於程式碼直接繼承了Spring提供的JdbcDaoSupport,因此沒有使用Connection、Statement等JDBC API，也不用關閉這些資源。JdbcDaoSupport會自動維護這些資源。程式碼中用Spring封裝好的JdbcTemplate來執行SQL、查詢Person列表、查詢單個Person屬性值、查詢Person的總數。查詢Person列表時返回的是一個List

package com.helloweenvsfei.spring.dao;

import java.sql.Date;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.springframework.jdbc.core.support.JdbcDaoSupport;
public class PersonDaoImpl extends JdbcDaoSupport implements IPersonDao {

    public void initDatabase()
    {
        String sql="create table if not exists tb_person "
                +"(id int auto_increment, "+"name varchar(255), "+"sex varchar(10) , age int ,birthday timestamp, primary key(id))";
        this.getJdbcTemplate().execute(sql);
    }
    @Override
    public String getPersonName(Integer id) {
        String sql="select name from tb_person where id="+id;
        return (String)this.getJdbcTemplate().queryForObject(sql, String.class);
    }

    @Override
    public void addPerson(Person person) {
        String sql="insert into tb_person(name,sex,age,birthday) values(?,?,?,?)";
        this.getJdbcTemplate().update(sql, new Object[]{
                person.getName(),person.getSex(),person.getAge(),person.getBirthday(),
        });
    }

    @Override
    public int getPersonCount() {
        String sql="select count(*) from tb_person";
        return this.getJdbcTemplate().queryForInt(sql);
    }

    @Override
    public List<Person> listPersons() {
        String sql="select id,name,sex,age,birthday for tb_person";
        @SuppressWarnings("unchecked")
        List<Map<String,Object>> list=this.getJdbcTemplate().queryForList(sql);
        List<Person> personList=new ArrayList<Person>();
        for(Map<String,Object> row:list)
        {
            Person person=new Person();
            person.setId((Integer)row.get("id"));
            person.setName(row.get("name").toString());
            person.setSex(row.get("sex").toString());
            person.setAge((Integer)row.get("age"));
            person.setBirthday((Date)row.get("birthday"));

            personList.add(person);
        }
        return personList;
    }

}

Spring配置

applicationContext.xml中需要配置一個數據源，並將該資料來源設定到personDao中。配置程式碼如下：
注意使用com.mysql.jdbc.Driver驅動需要新增下面的庫：
這裡寫圖片描述
ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql://localhost:3306/spring?characterEncoding=UTF-8">
    </property>
    <property name="username" value="root"></property>
    <property name="password" value="123"></property>
</bean>
<bean id="personDao" class="com.helloweenvsfei.spring.dao.PersonDaoImpl" depends-on="dataSource" init-method="initDatabase">
    <property name="dataSource" ref="dataSource"></property>
</bean>
</beans>

執行程式碼

執行程式前不需要建立表，PersonDaoImpl的initDatabase()會自動建立表結構。但是需要建立資料庫spring,因此initDatabase()無法建立資料庫。建立資料庫的DDL語句：

create database spring character set utf8;

下面的程式碼中先載入applicationContext.xml、建立BeanFactory並從中獲取DAO物件，然後例項化一個Person物件，並用DAO儲存進資料，最後輸出記錄總數、所有的Person物件。執行程式碼如下：
DaoRun.java

package com.helloweenvsfei.spring.dao;


import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class DaoRun {

    public static void main(String[] args) {
        XmlBeanFactory factory=new XmlBeanFactory(new ClassPathResource("applicationContext.xml"));
        IPersonDao personDao=(IPersonDao)factory.getBean("personDao");

        Person person=new Person();
        person.setName("Helloween");
        person.setAge(30);
        person.setSex("男");
        person.setBirthday(new Date());

        personDao.addPerson(person);
        System.out.println("Count:"+personDao.getPersonCount());

        System.out.println(personDao.getPersonName(1));
        List<Person> personList=new ArrayList<Person>();
        for(Person p:personList)
        {
            System.out.println("Name:"+p.getName());
        }
    }

}

執行效果如下：

2017-01-04 02:50:26,635 [org.springframework.core.env.MutablePropertySources]-[DEBUG] Adding [systemProperties] PropertySource with lowest search precedence
2017-01-04 02:50:26,647 [org.springframework.core.env.MutablePropertySources]-[DEBUG] Adding [systemEnvironment] PropertySource with lowest search precedence
2017-01-04 02:50:26,648 [org.springframework.core.env.AbstractEnvironment]-[DEBUG] Initialized StandardEnvironment with PropertySources [systemProperties,systemEnvironment]
2017-01-04 02:50:26,658 [org.springframework.beans.factory.xml.XmlBeanDefinitionReader]-[INFO] Loading XML bean definitions from class path resource [applicationContext.xml]
2017-01-04 02:50:26,698 [org.springframework.beans.factory.xml.DefaultDocumentLoader]-[DEBUG] Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl]
2017-01-04 02:50:26,771 [org.springframework.beans.factory.xml.PluggableSchemaResolver]-[DEBUG] Trying to resolve XML entity with public id [null] and system id [http://www.springframework.org/schema/beans/spring-beans-4.1.xsd]
2017-01-04 02:50:26,773 [org.springframework.beans.factory.xml.PluggableSchemaResolver]-[DEBUG] Loading schema mappings from [META-INF/spring.schemas]
2017-01-04 02:50:26,791 [org.springframework.beans.factory.xml.PluggableSchemaResolver]-[DEBUG] Loaded schema mappings: {http://www.springframework.org/schema/aop/spring-aop-4.1.xsd=org/springframework/aop/config/spring-aop-4.1.xsd, http://www.springframework.org/schema/context/spring-context-3.1.xsd=org/springframework/context/config/spring-context-3.1.xsd, http://www.springframework.org/schema/jms/spring-jms-2.5.xsd=org/springframework/jms/config/spring-jms-2.5.xsd, http://www.springframework.org/schema/util/spring-util-3.0.xsd=org/springframework/beans/factory/xml/spring-util-3.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd=org/springframework/web/servlet/config/spring-mvc-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool.xsd=org/springframework/beans/factory/xml/spring-tool-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-3.2.xsd=org/springframework/aop/config/spring-aop-3.2.xsd, http://www.springframework.org/schema/lang/spring-lang-4.1.xsd=org/springframework/scripting/config/spring-lang-4.1.xsd, http://www.springframework.org/schema/context/spring-context-4.0.xsd=org/springframework/context/config/spring-context-4.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd=org/springframework/web/servlet/config/spring-mvc-3.2.xsd, http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd=org/springframework/oxm/config/spring-oxm-3.0.xsd, http://www.springframework.org/schema/tool/spring-tool-4.1.xsd=org/springframework/beans/factory/xml/spring-tool-4.1.xsd, http://www.springframework.org/schema/lang/spring-lang-3.2.xsd=org/springframework/scripting/config/spring-lang-3.2.xsd, http://www.springframework.org/schema/cache/spring-cache-3.2.xsd=org/springframework/cache/config/spring-cache-3.2.xsd, http://www.springframework.org/schema/jee/spring-jee-4.1.xsd=org/springframework/ejb/config/spring-jee-4.1.xsd, http://www.springframework.org/schema/util/spring-util-2.0.xsd=org/springframework/beans/factory/xml/spring-util-2.0.xsd, http://www.springframework.org/schema/tool/spring-tool-3.2.xsd=org/springframework/beans/factory/xml/spring-tool-3.2.xsd, http://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-4.1.xsd, http://www.springframework.org/schema/cache/spring-cache-4.1.xsd=org/springframework/cache/config/spring-cache-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-4.0.xsd=org/springframework/aop/config/spring-aop-4.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.2.xsd=org/springframework/ejb/config/spring-jee-3.2.xsd, http://www.springframework.org/schema/context/spring-context-3.0.xsd=org/springframework/context/config/spring-context-3.0.xsd, http://www.springframework.org/schema/util/spring-util-2.5.xsd=org/springframework/beans/factory/xml/spring-util-2.5.xsd, http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd=org/springframework/web/servlet/config/spring-mvc-4.0.xsd, http://www.springframework.org/schema/beans/spring-beans-3.2.xsd=org/springframework/beans/factory/xml/spring-beans-3.2.xsd, http://www.springframework.org/schema/aop/spring-aop-3.1.xsd=org/springframework/aop/config/spring-aop-3.1.xsd, http://www.springframework.org/schema/lang/spring-lang-4.0.xsd=org/springframework/scripting/config/spring-lang-4.0.xsd, http://www.springframework.org/schema/mvc/spring-mvc.xsd=org/springframework/web/servlet/config/spring-mvc-4.1.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd=org/springframework/web/servlet/config/spring-mvc-3.1.xsd, http://www.springframework.org/schema/beans/spring-beans-4.1.xsd=org/springframework/beans/factory/xml/spring-beans-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-4.0.xsd=org/springframework/beans/factory/xml/spring-tool-4.0.xsd, http://www.springframework.org/schema/lang/spring-lang-3.1.xsd=org/springframework/scripting/config/spring-lang-3.1.xsd, http://www.springframework.org/schema/cache/spring-cache-3.1.xsd=org/springframework/cache/config/spring-cache-3.1.xsd, http://www.springframework.org/schema/jee/spring-jee-4.0.xsd=org/springframework/ejb/config/spring-jee-4.0.xsd, http://www.springframework.org/schema/task/spring-task-4.1.xsd=org/springframework/scheduling/config/spring-task-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-3.1.xsd=org/springframework/beans/factory/xml/spring-tool-3.1.xsd, http://www.springframework.org/schema/cache/spring-cache-4.0.xsd=org/springframework/cache/config/spring-cache-4.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.1.xsd=org/springframework/ejb/config/spring-jee-3.1.xsd, http://www.springframework.org/schema/task/spring-task-3.2.xsd=org/springframework/scheduling/config/spring-task-3.2.xsd, http://www.springframework.org/schema/beans/spring-beans-3.1.xsd=org/springframework/beans/factory/xml/spring-beans-3.1.xsd, http://www.springframework.org/schema/util/spring-util.xsd=org/springframework/beans/factory/xml/spring-util-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-3.0.xsd=org/springframework/aop/config/spring-aop-3.0.xsd, http://www.springframework.org/schema/jms/spring-jms-3.2.xsd=org/springframework/jms/config/spring-jms-3.2.xsd, http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd=org/springframework/web/servlet/config/spring-mvc-3.0.xsd, http://www.springframework.org/schema/beans/spring-beans-4.0.xsd=org/springframework/beans/factory/xml/spring-beans-4.0.xsd, http://www.springframework.org/schema/beans/spring-beans.xsd=org/springframework/beans/factory/xml/spring-beans-4.1.xsd, http://www.springframework.org/schema/lang/spring-lang-3.0.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd, http://www.springframework.org/schema/context/spring-context-2.5.xsd=org/springframework/context/config/spring-context-2.5.xsd, http://www.springframework.org/schema/jms/spring-jms-4.1.xsd=org/springframework/jms/config/spring-jms-4.1.xsd, http://www.springframework.org/schema/task/spring-task-4.0.xsd=org/springframework/scheduling/config/spring-task-4.0.xsd, http://www.springframework.org/schema/tool/spring-tool-3.0.xsd=org/springframework/beans/factory/xml/spring-tool-3.0.xsd, http://www.springframework.org/schema/aop/spring-aop-2.0.xsd=org/springframework/aop/config/spring-aop-2.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.0.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd, http://www.springframework.org/schema/task/spring-task-3.1.xsd=org/springframework/scheduling/config/spring-task-3.1.xsd, http://www.springframework.org/schema/util/spring-util-4.1.xsd=org/springframework/beans/factory/xml/spring-util-4.1.xsd, http://www.springframework.org/schema/beans/spring-beans-3.0.xsd=org/springframework/beans/factory/xml/spring-beans-3.0.xsd, http://www.springframework.org/schema/jee/spring-jee.xsd=org/springframework/ejb/config/spring-jee-4.1.xsd, http://www.springframework.org/schema/aop/spring-aop-2.5.xsd=org/springframework/aop/config/spring-aop-2.5.xsd, http://www.springframework.org/schema/jms/spring-jms.xsd=org/springframework/jms/config/spring-jms-4.1.xsd, http://www.springframework.org/schema/lang/spring-lang-2.0.xsd=org/springframework/scripting/config/spring-lang-2.0.xsd, http://www.springframework.org/schema/jms/spring-jms-3.1.xsd=org/springframework/jms/config/spring-jms-3.1.xsd, http://www.springframework.org/schema/oxm/spring-oxm.xsd=org/springframework/oxm/config/spring-oxm-4.1.xsd, http://www.springframework.org/schema/util/spring-util-3.2.xsd=org/springframework/beans/factory/xml/spring-util-3.2.xsd, http://www.springframework.org/schema/oxm/spring-oxm-4.1.xsd=org/springframework/oxm/config/spring-oxm-4.1.xsd, http://www.springframework.org/schema/task/spring-task.xsd=org/springframework/scheduling/config/spring-task-4.1.xsd, http://www.springframework.org/schema/tool/spring-tool-2.0.xsd=org/springframework/beans/factory/xml/spring-tool-2.0.xsd, http://www.springframework.org/schema/lang/spring-lang-2.5.xsd=org/springframework/scripting/config/spring-lang-2.5.xsd, http://www.springframework.org/schema/jee/spring-jee-2.0.xsd=org/springframework/ejb/config/spring-jee-2.0.xsd, http://www.springframework.org/schema/jms/spring-jms-4.0.xsd=org/springframework/jms/config/spring-jms-4.0.xsd, http://www.springframework.org/schema/oxm/spring-oxm-3.2.xsd=org/springframework/oxm/config/spring-oxm-3.2.xsd, http://www.springframework.org/schema/tool/spring-tool-2.5.xsd=org/springframework/beans/factory/xml/spring-tool-2.5.xsd, http://www.springframework.org/schema/jee/spring-jee-2.5.xsd=org/springframework/ejb/config/spring-jee-2.5.xsd, http://www.springframework.org/schema/task/spring-task-3.0.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd, http://www.springframework.org/schema/util/spring-util-4.0.xsd=org/springframework/beans/factory/xml/spring-util-4.0.xsd, http://www.springframework.org/schema/lang/spring-lang.xsd=org/springframework/scripting/config/spring-lang-4.1.xsd, http://www.springframework.org/schema/context/spring-context-3.2.xsd=org/springframework/context/config/spring-context-3.2.xsd, http://www.springframework.org/schema/jms/spring-jms-3.0.xsd=org/springframework/jms/config/spring-jms-3.0.xsd, http://www.springframework.org/schema/util/spring-util-3.1.xsd=org/springframework/beans/factory/xml/spring-util-3.1.xsd, http://www.springframework.org/schema/beans/spring-beans-2.0.xsd=org/springframework/beans/factory/xml/spring-beans-2.0.xsd, http://www.springframework.org/schema/oxm/spring-oxm-4.0.xsd=org/springframework/oxm/config/spring-oxm-4.0.xsd, http://www.springframework.org/schema/cache/spring-cache.xsd=org/springframework/cache/config/spring-cache-4.1.xsd, http://www.springframework.org/schema/context/spring-context-4.1.xsd=org/springframework/context/config/spring-context-4.1.xsd, http://www.springframework.org/schema/beans/spring-beans-2.5.xsd=org/springframework/beans/factory/xml/spring-beans-2.5.xsd, http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd=org/springframework/oxm/config/spring-oxm-3.1.xsd, http://www.springframework.org/schema/aop/spring-aop.xsd=org/springframework/aop/config/spring-aop-4.1.xsd}
2017-01-04 02:50:26,798 [org.springframework.beans.factory.xml.PluggableSchemaResolver]-[DEBUG] Found XML schema [http://www.springframework.org/schema/beans/spring-beans-4.1.xsd] in classpath: org/springframework/beans/factory/xml/spring-beans-4.1.xsd
2017-01-04 02:50:26,954 [org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader]-[DEBUG] Loading bean definitions
2017-01-04 02:50:27,005 [org.springframework.beans.factory.xml.BeanDefinitionParserDelegate]-[DEBUG] Neither XML 'id' nor 'name' specified - using generated bean name [com.helloweenvsfei.spring.aop.MethodBeforeInterceptor#4715c34e]
2017-01-04 02:50:27,009 [org.springframework.beans.factory.xml.BeanDefinitionParserDelegate]-[DEBUG] Neither XML 'id' nor 'name' specified - using generated bean name [com.helloweenvsfei.spring.aop.MethodAfterInterceptor#64a39f6]
2017-01-04 02:50:27,012 [org.springframework.beans.factory.xml.BeanDefinitionParserDelegate]-[DEBUG] Neither XML 'id' nor 'name' specified - using generated bean name [com.helloweenvsfei.spring.aop.ThrowsInterceptor#117a1ad3]
2017-01-04 02:50:27,016 [org.springframework.beans.factory.xml.BeanDefinitionParserDelegate]-[DEBUG] Neither XML 'id' nor 'name' specified - using generated bean name [com.helloweenvsfei.spring.aop.AopServiceImpl#591c486a]
2017-01-04 02:50:27,027 [org.springframework.beans.factory.support.DefaultSingletonBeanRegistry]-[DEBUG] Creating shared instance of singleton bean 'dataSource'
2017-01-04 02:50:27,028 [org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory]-[DEBUG] Creating instance of bean 'dataSource'
2017-01-04 02:50:27,072 [org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory]-[DEBUG] Eagerly caching bean 'dataSource' to allow for resolving potential circular references
2017-01-04 02:50:27,096 [org.springframework.core.io.support.SpringFactoriesLoader]-[DEBUG] Loaded [org.springframework.beans.BeanInfoFactory] names: [org.springframework.beans.ExtendedBeanInfoFactory]
2017-01-04 02:50:27,105 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Getting BeanInfo for class [org.apache.commons.dbcp.BasicDataSource]
2017-01-04 02:50:27,122 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Caching PropertyDescriptors for class [org.apache.commons.dbcp.BasicDataSource]
2017-01-04 02:50:27,123 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'accessToUnderlyingConnectionAllowed' of type [boolean]
2017-01-04 02:50:27,132 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'class' of type [java.lang.Class]
2017-01-04 02:50:27,136 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'connection' of type [java.sql.Connection]
2017-01-04 02:50:27,137 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'defaultAutoCommit' of type [boolean]
2017-01-04 02:50:27,138 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'defaultCatalog' of type [java.lang.String]
2017-01-04 02:50:27,139 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'defaultReadOnly' of type [boolean]
2017-01-04 02:50:27,140 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'defaultTransactionIsolation' of type [int]
2017-01-04 02:50:27,141 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'driverClassName' of type [java.lang.String]
2017-01-04 02:50:27,143 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'initialSize' of type [int]
2017-01-04 02:50:27,147 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'logAbandoned' of type [boolean]
2017-01-04 02:50:27,148 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'logWriter' of type [java.io.PrintWriter]
2017-01-04 02:50:27,149 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'loginTimeout' of type [int]
2017-01-04 02:50:27,150 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'maxActive' of type [int]
2017-01-04 02:50:27,151 [org.springframework.beans.CachedIntrospectionResults]-[DEBUG] Found bean property 'maxIdle' of type [int]
2017-01-04 02:50 
 

            
  

           

              
              

            

            
相關推薦

			   
            
            
            
 

    


    
    
Spring的DAO模組資料庫操作例項

     
 
							
							
							Spring的DAO模組提供了對了JDBC、Hibernate、JDO等DAO層支援。DAO模組依賴於 
，MyEclipse自帶的Spring DAO類庫沒有這兩個類庫，需要自己新增。 
下面以儲存實體Person為例作介紹： 
      傳統的JDBC程式 



  
 

    


    
    
資料庫操作例項

     
 
							
							
							建立一個簡單的表
create database school;             //建立一個叫‘school’的資料庫
use school;		//使用‘school’這個表
create table student(stu_id int not n 



  
 

    


    
    
C#與Sqlite資料庫操作例項

     
 
                這是一個有關分頁的例項,僅供參考(程式碼來自網路)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Dr 



  
 

    


    
    
ODBC連線MySQL資料庫操作例項

     
 
                
 
以下展示的一段程式，完成利用ODBC對MySQL資料庫操作功能，我的編譯環境時VC6，程式碼中有詳細的解釋，如果事先完成ODBC資料來源的設定工作，那麼只要對程式碼稍作修改即可使用：

#include<stdlib.h>
#include<stdio 



  
 

    


    
    
PYTHON自動化Day6-函式多個返回值和匿名函式、列表生成式，三元運算子，os模組，sys模組，時間模組，字典排序，資料庫操作，加密（md5）

     
 一.函式多個返回值和匿名函式 
 
 #函式返回多個值，用一個變數接收
def say():
    num1=1
    num2=2
    num3=3
    return num1,num2,num3
res=say()
print(res)  #打印出來是元組。 函式如果返回多個值的話，會把返回的 



  
 

    


    
    
設定storage模組的資料庫操作支援、新增倉儲分類列表介面（dao層）

     
 一、在storage模組的pom檔案中加入jdbc，mybatis，mysql依賴 
 
二、在yml檔案中加入datasource資料庫連線的四個屬性 
 
 三、在啟動類的包下新建controller，service，serviceImpl，dao，entity包並建好對應4個表的四組類 
 
 



  
 

    


    
    
使用spring-boot整合mybaits對資料庫進行操作例項

     
  
  
  
 新建專案，引入依賴 
 <parent> 
       <groupId>org.springframework.boot</groupId> 
       <artifactId>spring-boot-starter-parent< 



  
 

    


    
    
遞迴、os.walk、內建函式、lambda、hashlib模組、md5加密、python安裝第三方模組、操作mysql資料庫

     
 #遞迴就是函式自己調自己,一般遞迴都會有在什麼情況下結束遞迴，一業可以有結束條件#遞迴最多死迴圈999次，遞迴不能設定次數# count=0# def abc():#     global count#     count+=1#     print(count)#     print('abc')#     



  
 

    


    
    
【嘔心瀝血 感謝孟歡】資料庫操作java實現例項 封裝為函式

     
 
                實驗要求：

在安裝配置好資料庫Mysql後，需要使用Java程式設計完成如下任務：

（1）建立資料庫表users，欄位分別為username(主鍵，varchar(10))、pass(varchar(8))；資料庫表person，欄位按分別為username(varcha 



  
 

    


    
    
PHP中MongoDB資料庫的連線、新增、修改、查詢、刪除等操作例項

     
 
                
PHP 擴充套件mongon.mod.dll下載http://cn.php.net/manual/en/mongo.installation.php#mongo.installation.windows
然後php.ini新增 extension=php_mongo.dll 



  
 

    


    
    
ASP.NET操作mysql資料庫的例項（傻瓜都能看懂，已測試過）

     
 
                
一、把MySql.Data.dll放到BIN目錄下。二、這是aspx.cs的全部原始碼，修改引數直接執行即可！using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
usin 



  
 

    


    
    
使用mybatis 操作資料庫的例項程式

     
 
							
							
							

一、理解什麼是mybatis



MyBatis 是支援普通 SQL 查詢，儲存過程和高階對映的優秀持久層框架。 MyBatis 消除了幾乎所有的 JDBC 程式碼和引數的手工設定以及對結果集的檢索。 MyBatis 可以使用簡單的XML 或註解用於配置和 



  
 

    


    
    
JDBC實現資料庫的增刪改查操作例項

     
 import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.PreparedStatement 



  
 

    


    
    
Delphi通過ADO連結資料庫及對資料庫的增加，刪除，修改，讀取操作例項教程4

     
 ADO是一種程式物件，用於表示使用者資料庫中的資料結構和所包含的資料。ADO(ActiveXDataObjects，ActiveX資料物件）是Microsoft提出的應用程式介面（API）用以實現訪問關... 
7) ServerName    指定業務物件，即需要初始 



  
 

    


    
    
python資料庫操作之pymysql模組和sqlalchemy模組(專案必備)

     
 
                

pymysql

 pymsql是Python中操作MySQL的模組，其使用方法和MySQLdb幾乎相同。

1、下載安裝

pip3 install pymysql


2、操作資料庫

（1）、執行sql



#!/usr/bin/env python
# -*-  



  
 

    


    
    
ASP EF框架，資料庫操作類(上下文類)的例項建立，執行緒內唯一物件(HttpContext)

     
 
                
因為多個數據庫操作類例項(上下文例項)，多個例項同時操作資料庫可能會引起資料衝突，所以要用一個(同一個)操作類例項(工作單元模式，多次操作資料庫，操作多張表，但只連結一次資料庫，提高效能。(延遲載入(查詢)，打上刪除、修改標記，新增操作，然後利用同一個資料庫操作類.Save 



  
 

    


    
    
Python使用cx_Oracle模組連線操作Oracle資料庫

     
 
								
								            
						
                
1. 簡介
cx_Oracle 是一個用來連線並操作 Oracle 資料庫的 Python 擴充套件模組， 支援包括 Oracle 9.2 10.2 以及 11.1 等版本
2.安裝
最好是去官網ht 



  
 

    


    
    
Linux C語言程式設計-Linux資料庫操作--Linux上C語言操作SQLServer---知識點總結+例項

     
 
                
*********************注意:為了保證文章的完整性和全面性，作者會不定期對文章進行更新和修正*********************

1.freetds是什麼？
    freetds其實就是個軟體而且是一款開源軟體，而且這個軟體支援相當多的系統，比如 



  
 

    


    
    
MongoDB資料庫操作常用語法

     
  
  
  
 一、建立資料庫 
 建立： use DATABASE_NAME(資料庫名稱) 如果資料庫不存在，則建立資料庫，否則切換到指定資料庫。 顯示所有資料庫： show dbs 剛建立的資料庫，並不在資料庫的列表中， 要顯示它，我們需要向其中插入一些資料。 插入資料： db.DATABASE_NAM 



  
 

    


    
    
JDBC資料庫連線池連線資料庫及資料庫操作DAO層設計通用更新及查詢方法（二）

     
  
 
 上篇文章主要介紹了通過資料庫連線池連線資料庫，然後設計了對資料庫通用更新和查詢方法，本篇文章主要通過例項介紹上篇文章定義的對資料庫操作的幾個方法的使用： 
     首先我們先在資料庫建立一個學生資訊表Student欄位如圖： 
  
 建立好表將配置檔案的資訊改好然後需要建立一