1. Configuration: It is basically the same as the configuration of hibernate and mybatis, the only difference is the configuration of beans. The configuration of JDBCTemplate in spring is:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="${jdbc.driverClassName}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<bean id="jdbcTemplate"
class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
2. Use:
@Resource private JdbcTemplate jdbcTemplate;
ready to use.
3. Examples:
song:
package com.domain;
public class User {
private String id;
private String ucode;
private String name;
private String sex;
private String pwd;
private String sid;
private String school;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUcode() {
return ucode;
}
public void setUcode(String ucode) {
this.ucode = ucode;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
}
RowMapperUser:
package com.domain;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class RowMapperUser implements RowMapper<User> {
@Override
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User dbuser = new User();
dbuser.setId(rs.getString("id"));
dbuser.setName(rs.getString("name"));
dbuser.setPwd(rs.getString("pwd"));
dbuser.setSchool(rs.getString("school"));
dbuser.setSex(rs.getString("sex"));
dbuser.setSid(rs.getString("sid"));
dbuser.setUcode(rs.getString("ucode"));
return dbuser;
}
}
RowMapperRole:
public class RowMapperRole implements RowMapper<Role> {
/* (non-Javadoc)
* @see org.springframework.jdbc.core.RowMapper#mapRow(java.sql.ResultSet, int)
*/
@Override
public Role mapRow(ResultSet rs, int arg1) throws SQLException {
Role role = new Role();
role.setName(rs.getString("name"));
role.setRid(rs.getString("rid"));
return role;
}
}
dao:
(1.) Add, delete, modify: use the update method, here is just one example:
//increase
public int addUser(User user) {
String sql = "insert into user(id,ucode,name,sex,pwd,sid,school)"
+ " VALUES (?,?,?,?,?,?,?)";
int a = jdbcTemplate.update(sql, new Object[]{user.getId(), user.getUcode(),
user.getName(), user.getSex(), user.getPwd(), user.getSid(),
user.getSchool()});
return a;
}
(2,) Query a single field:
public Integer getCount(Map<String, Object> map) {
Integer count = null;
Object[] obj=null;
String role = (String) map.get("role");
String school = (String) map.get("school");
String sex = (String) map.get("sex");
String sql = "select count(*) from "
+ "(select u.id from user u left join userrole ur "
+ " on u.id=ur.uid left join role r on r.rid=ur.rid "
+ " where 1=1 ";
// unconditional query
if (role == null && school == null && sex == null) {
System.out.println("Unconditional query");
sql += "group by u.id) as a";
obj=new Object[]{};
}
// full conditional query
if (role != null && school != null && sex != null) {
sql += " and r.name=? and school=? and sex=? group by u.id) as a";
System.out.println("before full conditional query");
obj=new Object[]{role, school, sex};
System.out.println("After full conditional query");
}
// only check schools
if (role == null && school != null && sex == null) {
sql += " and school=? group by u.id) as a";
obj=new Object[]{school};
}
// only check gender
if (role == null && school == null && sex != null) {
sql += " and sex=? group by u.id) as a";
obj=new Object[]{sex};
}
// only check permissions
if (role != null && school == null && sex == null) {
sql += " and r.name=? group by u.id) as a";
obj=new Object[]{role};
}
// Check permissions and schools
if (role != null && school != null && sex == null) {
sql += " and r.name=? and school=? group by u.id) as a";
obj=new Object[]{role, school};
}
// look up school and gender
if (role == null && school != null && sex != null) {
sql += " and school=? and sex=? group by u.id) as a";
obj=new Object[]{school, sex};
}
// Check permissions and gender
if (role != null && school == null && sex != null) {
sql += " and r.name=? and sex=? group by u.id) as a";
obj=new Object[]{role, sex};
}
count=jdbcTemplate.queryForObject(sql, obj,Integer.class);
return count;
}
public String getRidByName(String name) {
String sql = "select rid from role where name=?";
String rid=jdbcTemplate.queryForObject(sql, new Object[]{name},String.class);
return rid;
}
(3,) Query a single object:
/**
* @Title: getUser
* @Description: <!--Get logged in user byId-->
* @param user
* user
* @return return user information
*/
public User getUser(User user) {
String sql = "select * from user where id=?";
User dbuser =jdbcTemplate.queryForObject(sql, new Object[]{user.getId()},new RowMapperUser());
return dbuser;
}
(4,) Query object collection:
/**
* @Title: getUserRoles
* @Description: Get all permissions of the user
* @param user
* user
* @return returns a list of permissions
*/
public List<Role> getUserRoles(User user) {
// new ArrayList<>();
String sql = "select * from role r left join "
+ "userrole ur on r.rid=ur.rid left join user u "
+ " on ur.uid=u.id where u.id=?";
List<Role> list = jdbcTemplate.query(sql,
new Object[] { user.getId() }, new RowMapperRole());
return list;
}