Ibatis动态(dynamic)查询

Ibatis的动态查询使得数据操作变得非常的灵活，下次举出了常用的动态查询的属性信息：
Ibatis配置信息

<!-- Dynamic Sql -->
  <typeAlias alias="Student" type="com.ibatis.Student" />
	<typeAlias alias="StudentDTO" type="com.ibatis.StudentDTO" />
	<select id="dynamicGetStudent" parameterClass="StudentDTO"
		resultClass="Student">
		select *
		from student
		<dynamic prepend="WHERE">
			<isNotEqual prepend="AND" property="sid" compareValue="0">
				sid = #sid#
			</isNotEqual>
			
			<isNotNull prepend="AND" property="sname">
				sname = #sname#
			</isNotNull>
		</dynamic>
		<dynamic prepend="order by">
			<isParameterPresent>
				<isEqual prepend="order by" property="sort" compareValue="1">
					sname desc,socre
				</isEqual>
				
				<isEqual prepend="order by" property="sort" compareValue="2">
					sname asc,socre
				</isEqual>
			</isParameterPresent>
		</dynamic>
	</select>

Student的信息

package com.ibatis;

import java.util.Date;

public class Student {
	private int sid;
	private String sname;
	private String major;
	private Date birth;
	private int socre;
	public int getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
	public Date getBirth() {
		return birth;
	}
	public void setBirth(Date birth) {
		this.birth = birth;
	}
	public int getSocre() {
		return socre;
	}
	public void setSocre(int socre) {
		this.socre = socre;
	}
	
	@Override
	public String toString() {
		String content = "Sid="+this.sid+"\t"+"Sname="+this.sname+"\t"+this.birth.toLocaleString();
		return content;
	}
	
}

StudentDTO的信息

package com.ibatis;

import java.util.Date;

public class StudentDTO {
	private int sid;
	private String sname;
	private String major;
	private Date birth;
	private int socre;
	private int sort;
	public int getSort() {
		return sort;
	}
	public void setSort(int sort) {
		this.sort = sort;
	}
	public int getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
	public Date getBirth() {
		return birth;
	}
	public void setBirth(Date birth) {
		this.birth = birth;
	}
	public int getSocre() {
		return socre;
	}
	public void setSocre(int socre) {
		this.socre = socre;
	}
	
	@Override
	public String toString() {
		String content = "Sid="+this.sid+"\t"+"Sname="+this.sname+"\t"+this.birth.toLocaleString();
		return content;
	}
	
}

Java中的调用信息

@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		List<Student> list = dao.dynamicGetStudent(studentDTO);
		for(Student student : list){
			System.out.println("name:"+student.getSname());
		}
		System.out.println("size:"+list.size());
	}
@Override
	public List dynamicGetStudent(StudentDTO studentDTO) {
		List result = null;
		try {
			result = sqlMapClient.queryForList("dynamicGetStudent",studentDTO);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return result;
	}

动态查询中的常用属性：

属性关键字	含义
<isEqual>	如果参数相等于值则查询条件有效
<isNotEqual>	如果参数不等于值则查询条件有效
<isGreaterThan>	如果参数大于值则查询条件有效
<isGreaterEqual>	如果参数等于值则查询条件有效
<isLessEqual>	如果参数小于值则查询条件有效。如下所示：<isLessEqual prepend = ”AND” property = ”age” compareValue = ”18” >ADOLESCENT = ‘TRUE’</isLessEqual>
<isPropertyAvailable>	如果参数有使用则查询条件有效。
<isNotPropertyAvailable>	如果参数没有使用则查询条件有效
<isNull>	如果参数为NULL则查询条件有效
<isNotNull>	如果参数不为NULL则查询条件有效
<isEmpty>	如果参数为空则查询条件有效
<isNotEmpty>	如果参数不为空则查询条件有效
<isParameterPresent>	如果参数类不为NULL则查询条件有效
<isNotParameterPresent>	Checks to see if the parameter object is not present (null). Example Usage