dbutils中ResultSetHandler用法

package com.jdbc.dao;

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

import org.apache.commons.dbutils.BeanProcessor;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.ArrayHandler;
import org.apache.commons.dbutils.handlers.ArrayListHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.jdbc.db.DBConnection;
import com.jdbc.entity.Book;
import com.jdbc.entity.School;
import com.jdbc.entity.Student;

public class Test {

public static void main(String[] args) {

Test t = new Test();

// dbutils 自带的一个结果集处理类，只把查询结果的第一行封装成数组
t.testArrayHandler();

// dbutils 自带的一个结果集处理类，把查询结果的每一个行都封装到数组再把数组装到集合中
t.testArrayListHandler();

// dbutils 自带的一个结果集处理类，把查询结果封装在bean中
t.testBeanHandler();

// dbutils 自带的一个结果集处理类，把查询结果封装在bean中再把bean装到集合中
t.testBeanListHandler();

// 两个表查封装到一个bean中
t.queryTwoTable();

// 把两个表联查的每行数据封装到bean中再装入集合
t.queryListTwoTable();

// 3个表联查封装成级联bean
t.queryListThreeTable();

t.insert();
t.upload();
t.detele();

// 把数据插入两张表
t.insertTwoTable();

}

public void testArrayHandler() {

ResultSetHandler<Object[]> rsh = new ArrayHandler();
QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";
try {
Object[] arr = qr.query(sql, rsh);
for (int i = 0; i < arr.length; i++)
System.out.print(arr[i].toString() + "\t");
System.out.println("");
} catch (SQLException e) {
e.printStackTrace();
}

}

public void testArrayListHandler() {

ResultSetHandler<List<Object[]>> rsh = new ArrayListHandler();
QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";

try {
List<Object[]> list = qr.query(sql, rsh);
int size = list.size();
for (int i = 0; i < size; i++) {
Object[] arr = list.get(i);
for (int j = 0; j < arr.length; j++)
System.out.print(arr[j].toString() + "\t");
System.out.println("");
}
System.out.println("");
} catch (SQLException e) {
e.printStackTrace();
}

}

public void testBeanHandler() {

ResultSetHandler<Student> rsh = new BeanHandler<Student>(Student.class);
QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";

try {
Student student = qr.query(sql, rsh);
System.out.print(student.getStudent_id() + "\t");
System.out.print(student.getStudent_name() + "\t");
System.out.print(student.getStudent_age() + "\t");
System.out.print(student.getStudent_email() + "\n");

} catch (SQLException e) {
e.printStackTrace();
}

}

public void queryTwoTable() {

QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";

try {
Student student = qr.query(sql, new ResultSetHandler<Student>() {

public Student handle(ResultSet rs) throws SQLException {
Student student = null;
if (rs.next()) {
BeanProcessor bp = new BeanProcessor();
student = bp.toBean(rs, Student.class);
Book book = bp.toBean(rs, Book.class);
student.setBook(book);
}
return student;
}
});

System.out.print(student.getStudent_id() + "\t");
System.out.print(student.getStudent_name() + "\t");
System.out.print(student.getStudent_age() + "\t");
System.out.print(student.getStudent_email() + "\t");

System.out.print(student.getBook().getBook_id() + "\t");
System.out.print(student.getBook().getBook_name() + "\t");
System.out.print(student.getBook().getBook_price() + "\n");

} catch (SQLException e) {
e.printStackTrace();
}

}

public void testBeanListHandler() {

ResultSetHandler<List<Student>> rsh = new BeanListHandler<Student>(Student.class);
QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";

try {
List<Student> list = qr.query(sql, rsh);
int size = list.size();
for (int i = 0; i < size; i++) {
Student student = list.get(i);
System.out.print(student.getStudent_id() + "\t");
System.out.print(student.getStudent_name() + "\t");
System.out.print(student.getStudent_age() + "\t");
System.out.print(student.getStudent_email() + "\n");
}
} catch (SQLException e) {
e.printStackTrace();
}

}

public void queryListTwoTable() {

QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "select * from student, book where student.book_id = book.book_id";

try {

List<Student> list = qr.query(sql,
new ResultSetHandler<List<Student>>() {

public List<Student> handle(ResultSet rs) throws SQLException {
List<Student> list = new ArrayList<Student>();
BeanProcessor bp = new BeanProcessor();
while (rs.next()) {

Student student = bp.toBean(rs, Student.class);
Book book = bp.toBean(rs, Book.class);
student.setBook(book);
list.add(student);
}
return list;
}

});

if (list != null && !list.isEmpty()) {
for (Student student : list) {
System.out.print(student.getStudent_id() + "\t");
System.out.print(student.getStudent_name() + "\t");
System.out.print(student.getStudent_age() + "\t");
System.out.print(student.getStudent_email() + "\t");

System.out.print(student.getBook().getBook_id() + "\t");
System.out.print(student.getBook().getBook_name() + "\t");
System.out.print(student.getBook().getBook_price() + "\n");
}
}

} catch (SQLException e) {
e.printStackTrace();
}

}

public void queryListThreeTable() {

Connection conn = null;
QueryRunner qr = new QueryRunner();

List<School> schoolList = null;
try {

conn = new DBConnection().getConnection();
String sql = "select * from school";
schoolList = qr.query(conn, sql, new BeanListHandler<School>(School.class));

if (schoolList != null && !schoolList.isEmpty()) {
for (School school : schoolList) {
sql = "select * from student, book where student.book_id = book.book_id and student.school_id = ?";
ResultSetHandler<List<Student>> rsh = new ResultSetHandler<List<Student>>() {

public List<Student> handle(ResultSet rs) throws SQLException {

List<Student> list = new ArrayList<Student>();
BeanProcessor bp = new BeanProcessor();
while (rs.next()) {

Student student = bp.toBean(rs, Student.class);
Book book = bp.toBean(rs, Book.class);
student.setBook(book);
list.add(student);
}
return list;
}

};
List<Student> studentList = qr.query(conn, sql, rsh, school.getSchool_id());
school.setStudentList(studentList);
}

}

} catch (SQLException e) {
e.printStackTrace();
} finally {
DbUtils.closeQuietly(conn);
}

if (schoolList != null && !schoolList.isEmpty()) {
for (School school : schoolList) {
System.out.print(school.getSchool_id() + "\t");
System.out.print(school.getSchool_name() + "\t");
System.out.print(school.getSchool_address() + "\n");
for (Student student : school.getStudentList()) {
System.out.print("\t" + student.getStudent_id() + "\t");
System.out.print(student.getStudent_name() + "\t");
System.out.print(student.getStudent_age() + "\t");
System.out.print(student.getStudent_email() + "\t");

System.out.print(student.getBook().getBook_id() + "\t");
System.out.print(student.getBook().getBook_name() + "\t");
System.out.print(student.getBook().getBook_price() + "\n");
}
}

}

}

public void insert() {

QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "insert into student values(?, ?, ?, ?)";
Object[] params = new Object[] { "seven", 23, "seven123@qq.com", 1 };

try {
System.out.println(qr.update(sql, params));
} catch (SQLException e) {
e.printStackTrace();
}

}

public void insertTwoTable() {

Connection conn = null;
PreparedStatement pst = null;
ResultSet rs = null;

try {
conn = new DBConnection().getConnection();
QueryRunner qr = new QueryRunner();

conn.setAutoCommit(false);

String sql = "insert into book values(?, ?)";
Object[] params = new Object[] { "C#", 99.36 };

pst = conn.prepareStatement(sql,
PreparedStatement.RETURN_GENERATED_KEYS);
qr.fillStatement(pst, params);
pst.execute();
rs = pst.getGeneratedKeys();
int book_id = rs.next() ? rs.getInt(1) : 0;

sql = "insert into student values(?, ?, ?, ?)";
params = new Object[] { "seven", 23, "seven123@qq.com", book_id };

pst = conn.prepareStatement(sql);
qr.fillStatement(pst, params);
pst.execute();

conn.commit();

} catch (SQLException e) {
try {
DbUtils.rollback(conn);
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
} finally {
DbUtils.closeQuietly(conn, pst, rs);
}

}

public void upload() {

QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "update student set student_name = ? where student_id = ?";
Object[] params = new Object[] { "seven+++", 11 };

try {
System.out.println(qr.update(sql, params));
} catch (SQLException e) {
e.printStackTrace();
}

}

public void detele() {

QueryRunner qr = new QueryRunner(new DBConnection());

String sql = "delete from student where student_id = ?";
Object[] params = new Object[] { 11 };

try {
System.out.println(qr.update(sql, params));
} catch (SQLException e) {
e.printStackTrace();
}

}

}