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>
<!-- 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;
- }
- }
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;
- }
- }
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;
- }
@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 |