今天把commons-dbutils-1.3的源码看了一遍
然后写了以下的示例代码
数据库用的是MS SQL SERVER 2005
就建立了三张表做测试
小工具用来起就是方便
学习这个小工具的源码是学习hibernate源码的一个很好的阶梯
这张是数据库表，一共三张，每个表的ID都是自动增长列
这个是项目结构
测试代码
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();
}
}
}
这张是t.queryListThreeTable()的查询效果
这张是t.queryListTwoTable()的查询效果
这张是t.queryTwoTable()的查询效果
最后附上示例代码
- 大小: 35 KB
- 大小: 17.7 KB
- 大小: 16.2 KB
- 大小: 8.1 KB
- 大小: 27.8 KB
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