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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