JDBCtemplete 模板

package com.augmentum.oes.common;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.augmentum.oes.exception.DBException;
import com.augmentum.oes.util.DBUtil;

public class JDBCTemplete<T> {

    public List<T> query(String sql, JDBCCallback <T> jdbccallbaclk) {
        Connection conn =null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        List<T> data = new ArrayList<T>();
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }

            stmt = conn.prepareStatement(sql);
            jdbccallbaclk.setParams(stmt);
            rs = stmt.executeQuery();
            while (rs.next()) {
                T object = jdbccallbaclk.rsToObject(rs);
                data.add(object);
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new DBException();
        } finally {
            DBUtil.close(null, stmt, rs);
            if (needMyClose) {
                DBUtil.close(conn, null, null);
            }
        }
        return data;
    }

    public int insert(String sql, JDBCCallback<T> jdbcCallback) {
        Connection conn =null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        int id = 0;
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }
             stmt = conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);
             jdbcCallback.setParams(stmt);
             stmt.executeUpdate();

             rs = stmt.getGeneratedKeys();
             if (rs.next()) {
                 id = rs.getInt(1);
             }
           } catch (Exception e) {
             e.printStackTrace();
             throw new DBException();
           } finally {
              DBUtil.close(null, stmt, null);
              if (needMyClose) {
                  DBUtil.close(conn, null, null);
              }
           }
        return id;
    };

    public void insertWithoutKey(String sql, JDBCCallback<T> jdbcCallback) {
        Connection conn =null;
        PreparedStatement stmt = null;
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }
            stmt = conn.prepareStatement(sql);
            jdbcCallback.setParams(stmt);
            stmt.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
            throw new DBException();
        } finally {
            DBUtil.close(null, stmt, null);
            if (needMyClose) {
                DBUtil.close(conn, null, null);
            }
        }
    };

    public T QueryOne(String sql, JDBCCallback<T> jdbcCallback) {
       List<T> data = query(sql, jdbcCallback);

       if (data !=null && !data.isEmpty()) {
           return data.get(0);
       } else {
           return null;
       }
    }

    public int update(String sql,JDBCCallback<T> jdbcCallback) {
        Connection conn =null;
        PreparedStatement stmt = null;
        int count = 0;
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }
             stmt = conn.prepareStatement(sql);
             jdbcCallback.setParams(stmt);
             count = stmt.executeUpdate();
           } catch (Exception e) {
             e.printStackTrace();
             throw new DBException();
           } finally {
              DBUtil.close(null, stmt, null);
              if (needMyClose) {
                  DBUtil.close(conn, null, null);
              }
           }
        return count;
    }

    public int deleteByid(String sql, JDBCCallback<T> jdbcCallback) {
        Connection conn =null;
        PreparedStatement stmt = null;
        int count = 0;
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }
             stmt = conn.prepareStatement(sql);
             jdbcCallback.setParams(stmt);
             count = stmt.executeUpdate();
           } catch (Exception e) {
             e.printStackTrace();
             throw new DBException();
           } finally {
              DBUtil.close(null, stmt, null);
              if (needMyClose) {
                  DBUtil.close(conn, null, null);
              }
           }
        return count;
    }

    public int getCount(String sql,JDBCCallback<T> jdbcCallback) {
        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        int count =0;
        boolean needMyClose = false;
        try {
          ConnectionHolder   connectionHolder = (ConnectionHolder) AppContext.getAppContext().getObject("APP_REQUEST_THREAD_CONNECTION");
              if (connectionHolder != null) {
                  conn = connectionHolder.getConn();
              }
             if (conn == null) {
                 conn = DBUtil.getConnection();
                 needMyClose = true;
             }
            stmt = conn.prepareStatement(sql);
            jdbcCallback.setParams(stmt);
            rs = stmt.executeQuery();
            if (rs.next()) {
                count = rs.getInt(1);
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new DBException();
        } finally {
            DBUtil.close(null, stmt, rs);
            if (needMyClose) {
                DBUtil.close(conn, null, null);
            }
        }
        return count;
    }

    public int getCountAll(String sql) {
        return this.getCount(sql, new JDBCAbstractCallback<T>() {});
    }
}

JDBCTemplete

package com.augmentum.oes.common;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public interface JDBCCallback<T> {

    T rsToObject(ResultSet rs) throws SQLException;

    void setParams(PreparedStatement stmt) throws SQLException;

}

　　加入数据

package com.augmentum.oes.dao.impl;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;

import com.augmentum.oes.common.JDBCAbstractCallback;
import com.augmentum.oes.common.JDBCCallback;
import com.augmentum.oes.dao.QuestionDao;
import com.augmentum.oes.model.Question;
import com.augmentum.oes.util.Pagination;
import com.augmentum.oes.util.StringUtil;

public class QuestionDaoImpl implements QuestionDao{

    private Question rsToQuestion(ResultSet rs) throws SQLException {
        Question question = new Question();
        question.setId(rs.getInt("id"));
        question.setQuestion_desc(rs.getString("question_desc"));
        question.setRight_choice_name(rs.getString("right_choice_name"));
        question.setChoice_a(rs.getString("choice_a"));
        question.setChoice_b(rs.getString("choice_b"));
        question.setChoice_c(rs.getString("choice_c"));
        question.setChoice_d(rs.getString("choice_d"));
        question.setQuestion_status(rs.getInt("question_status"));
        return question;
    }

    private JdbcTemplate jdbcTemplate;

    @Override
    public Question queryById(final int question_id){
        String sql = "SELECT * FROM question where id = ?" ;
        JDBCCallback<Question> j = new JDBCAbstractCallback<Question>() {
            @Override
            public void setParams(PreparedStatement stmt) throws SQLException {
                stmt.setInt(1, question_id);
                super.setParams(stmt);
            }

            @Override
             public Question rsToObject(ResultSet rs) throws SQLException {
                 return rsToQuestion(rs);
            }
        };
        List<Question> list = jdbcTemplete.query(sql,j);
        return list.get(0);
    }

    @Override
    public int update(final Question question) {
        String sql = "UPDATE question SET question_desc=?,right_choice_name=?,"
                + "choice_a=?, choice_b=?,choice_c=?,choice_d=?,question_status=? WHERE id = ?  ";
        int count =jdbcTemplete.update(sql, new JDBCAbstractCallback<Question>() {

            @Override
            public void setParams(PreparedStatement stmt) throws SQLException {
                stmt.setString(1, question.getQuestion_desc());
                stmt.setString(2, question.getRight_choice_name());
                stmt.setString(3, question.getChoice_a());
                stmt.setString(4, question.getChoice_b());
                stmt.setString(5, question.getChoice_c());
                stmt.setString(6, question.getChoice_d());
                stmt.setInt(7, question.getQuestion_status());
                stmt.setInt(8, question.getId());

            }
        });
        return count;
    }

    @Override
    public List<Question> getListByKeyWord(final String keyword, Pagination pagination,String orderTags) {
        pagination.setTotalCount(this.getCount(keyword));

        if (pagination.getCurrentPage() > pagination.getTotalCount()) {
            pagination.setCurrentPage(pagination.getTotalCount());
        }
        String sql ="SELECT * FROM question WHERE question_status = 0 AND question_desc LIKE ? ORDER BY id "+(StringUtil.isEmpty(orderTags)?"ASC":"DESC")+" LIMIT "+pagination.getOffset()+","+pagination.getPageSize() ;
        List<Question> list = jdbcTemplete.query(sql, new JDBCAbstractCallback<Question>() {
            @Override
            public void setParams(PreparedStatement stmt) throws SQLException {
                stmt.setString(1,"%"+keyword+"%");
            }
            @Override
            public Question rsToObject(ResultSet rs) throws SQLException {

                return rsToQuestion(rs);
            }
        });
        return list;
    }

    @Override
    public List<Question> getList(Pagination pagination,String orderTags) {
        pagination.setTotalCount(this.getCount(null));
        if (pagination.getCurrentPage() > pagination.getTotalCount()) {
            pagination.setCurrentPage(pagination.getTotalCount());
        }
        String sql ="SELECT * FROM question WHERE question_status = 0 ORDER BY id "+(StringUtil.isEmpty(orderTags)?"ASC":"DESC")+" LIMIT "+pagination.getOffset()+","+pagination.getPageSize() ;
        List<Question> list = jdbcTemplete.query(sql, new JDBCAbstractCallback<Question>() {

            @Override
            public Question rsToObject(ResultSet rs) throws SQLException {
                return rsToQuestion(rs);
            }
        });
        return list;
    }

    @Override
    public int deleteById(final int id) {
       // String sql = "DELETE FROM question where id = ?";
        String sql = "UPDATE question SET question_status=1 WHERE id= ?";
        int count = jdbcTemplete.deleteByid(sql, new JDBCAbstractCallback<Question>() {
            @Override
            public void setParams(PreparedStatement stmt) throws SQLException {
                stmt.setInt(1, id);
            }
        });
        return count;
    }

    @Override
    public int getCount(final String question_desc) {
        int count =0;
        String sql = "SELECT count(*) FROM question WHERE question_status = 0";
        if (StringUtil.isEmpty(question_desc)) {
            count = jdbcTemplete.getCountAll(sql);
        } else {
            sql = sql +" where question_desc LIKE ?";
            count = jdbcTemplete.getCount(sql, new JDBCAbstractCallback<Question>() {
            @Override
            public void setParams(PreparedStatement stmt) throws SQLException {
                stmt.setString(1,"%"+question_desc+"%");
                super.setParams(stmt);
            }
            });
        }

        return count;
    }

    @Override
    public int getNextId() {
        int nextId = 0;
        String sql = "SELECT max(id) FROM question";
        nextId = jdbcTemplete.getCountAll(sql);
        return nextId;
    }

    @Override
    public void addUpdate(final Question question) {
        String sql = "INSERT INTO question(question_status) VALUES (?)";
         jdbcTemplete.insert(sql, new JDBCAbstractCallback<Question>() {

             @Override
             public void setParams(PreparedStatement stmt) throws SQLException {
                 stmt.setInt(1, question.getQuestion_status());
             }
         });
    }
}

二 SpringJdbcTemplate

<context:property-placeholder location="classpath:config.properties"/> 也可以引入

引入数据库配置文件
  <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
           <list>
                <value>classpath:config.properties</value>
           </list>
        </property>
    </bean>

spring引入数据库配置文件

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>

        <property name="maxPoolSize" value="20" />
        <property name="minPoolSize" value="5" />
        <property name="acquireIncrement" value="3" />
        <property name="initialPoolSize" value="5"></property>
    </bean>

c3p0连接池

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!-- 初始化dataSource里面的参数 -->
  <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
  <property name="url" value="jdbc:mysql:///spring3_day2"></property>
 <property name="username" value="root"></property>
<property name="password" value="root"></property>
</bean>

spring内置连接池

applicationContext注入     
<bean id="baseDao" abstract="true">
         <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <bean class="com.augmentum.oes.util.SpringUtil" />
其他dao  配置parent=“basedao”

web.xml监听注入

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <display-name>contextLoaderListener</display-name>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

读取applicationContext.xml 来得到相应实例的类    需先在xml中写入     <bean class="com.augmentum.oes.util.SpringUtil" />

web.xml加载会通过ApplicationContextAware接口找到他

public class SpringUtil implements ApplicationContextAware{
private static ApplicationContext applicationContext = null;

@Override
/**
* nedd set in applicationContext.xml , read the ApplicationContextAware interface
*/
public void setApplicationContext(ApplicationContext ac) throws BeansException { //beanFactory
applicationContext = ac;
}
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
public static Object getBean(String beanId) {
ApplicationContext applicationContext = getApplicationContext();
return applicationContext.getBean(beanId);
}
}