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);
}
}

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