Spring JDBC Tutorial with Examples
In this lesson, I am going to guide you for using JdbcTemplate class. This is a central class in the Spring JDBC, which includes the most common logics in using the JDBC API to access databases, for example, creating connections and query commands, deleting, editing and updating data ... This class can be found in the org.springframework.jdbc.core package.
The objective of the lesson is to provide examples using the methods of JdbcTemplate class.
- JdbcTemplate.queryForList
- JdbcTemplate.queryForRowSet
- JdbcTemplate.query
- JdbcTemplate.queryForObject
- ...
Let's ensure that you may have created a project using Spring JDBC to connect to a specific database. If not, you can refer to the following lesson:
1. Modal Classes
Department.java
package org.o7planning.springjdbc.model;
public class Department {
private Long deptId;
private String deptNo;
private String deptName;
public Department() {
}
public Department(Long deptId, String deptNo, String deptName) {
this.deptId = deptId;
this.deptNo = deptNo;
this.deptName = deptName;
}
public Long getDeptId() {
return deptId;
}
public void setDeptId(Long deptId) {
this.deptId = deptId;
}
public String getDeptNo() {
return deptNo;
}
public void setDeptNo(String deptNo) {
this.deptNo = deptNo;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
}2. JdbcTemplate.queryForList -> List
No ADS
The first and the simplest example of Spring JDBC is a query that retrieves list of column values.
QueryForListReturnListDAO.java
package org.o7planning.springjdbc.dao;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryForListReturnListDAO extends JdbcDaoSupport {
@Autowired
public QueryForListReturnListDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
public List<String> getDeptNames() {
String sql = "Select d.dept_name from Department d ";
// queryForList(String sql, Class<T> elementType)
List<String> list = this.getJdbcTemplate().queryForList(sql, String.class);
return list;
}
public List<String> getDeptNames(String searchName) {
String sql = "Select d.dept_name from Department d "//
+ " Where d.dept_name like ? ";
// queryForList(String sql, Class<T> elementType, Object... args)
List<String> list = this.getJdbcTemplate().queryForList(sql, String.class, //
"%" + searchName + "%");
return list;
}
}QueryForListReturnList_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import java.util.List;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryForListReturnListDAO;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class QueryForListReturnList_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryForListReturnListDAO dao = context.getBean(QueryForListReturnListDAO.class);
List<String> names = dao.getDeptNames("A");
for (String name : names) {
System.out.println("Dept Name: " + name);
}
}
}Running the example:
Dept Name: ACCOUNTING
Dept Name: RESEARCH
Dept Name: SALES
Dept Name: OPERATIONS3. JdbcTemplate.queryForList -> List<Map>
No ADS
// JdbcTemplate.queryForList methods, return List<Map<String,Object>>
public List<Map<String, Object>> queryForList(String sql,
Object[] args, int[] argTypes) throws DataAccessException;
public List<Map<String, Object>> queryForList(String sql,
Object... args) throws DataAccessException;
Example:
QueryForListReturnListMapDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.Types;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryForListReturnListMapDAO extends JdbcDaoSupport {
@Autowired
public QueryForListReturnListMapDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
// Map<String columnName, Object value>
public List<Map<String, Object>> queryForList_ListMap() {
String sql = "Select e.Emp_No, e.Emp_Name from Employee e ";
// List<Map<String, Object>> queryForList(String sql)
List<Map<String, Object>> list = this.getJdbcTemplate().queryForList(sql);
return list;
}
// List<Map<String, Object>>
// queryForList(String sql, Object[] args, int[] argTypes)
public List<Map<String, Object>> queryForList_ListMap2() {
String sql = "Select e.Emp_Id,e.Emp_No,e.Emp_Name From Employee e " //
+ " Where e.Hire_Date > ? and e.Salary > ? ";
//
Date hireDate = getDateByYear(1981);
Object[] args = new Object[] { hireDate, 2800 };
int[] argTypes = new int[] { Types.DATE, Types.DOUBLE };
// List<Map<String, Object>> queryForList(String sql)
List<Map<String, Object>> list = this.getJdbcTemplate().queryForList(sql, args, argTypes);
return list;
}
private Date getDateByYear(int year) {
java.sql.Date date = new java.sql.Date(System.currentTimeMillis());
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DAY_OF_YEAR, 1);
return c.getTime();
}
}QueryForListReturnListMap_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryForListReturnListMapDAO;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class QueryForListReturnListMap_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryForListReturnListMapDAO dao = context.getBean(QueryForListReturnListMapDAO.class);
// Map<String columnName, Object value)
List<Map<String, Object>> list = dao.queryForList_ListMap2();
for (Map<String, Object> map : list) {
System.out.println("-----");
for (String key : map.keySet()) {
System.out.println("Key: " + key + " - value: " + map.get(key));
}
}
}
}Running the example:
-----
Key: EMP_ID - value: 7839
Key: EMP_ID - value: E7839
Key: EMP_NAME - value: KING
-----
Key: EMP_ID - value: 7566
Key: EMP_ID - value: E7566
Key: EMP_NAME - value: JONES
...4. JdbcTemplate.queryForRowSet
// JdbcTemplate.queryForRowSet methods ....
public SqlRowSet queryForRowSet(String sql,
Object[] args, int[] argTypes) throws DataAccessException;
public SqlRowSet queryForRowSet(String sql, Object... args)
throws DataAccessException;QueryForRowSetReturnSqlRowSetDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.Types;
import java.util.Calendar;
import java.util.Date;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import org.springframework.stereotype.Repository;
@Repository
public class QueryForRowSetReturnSqlRowSetDAO extends JdbcDaoSupport {
@Autowired
public QueryForRowSetReturnSqlRowSetDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
// SqlRowSet queryForRowSet(String sql, Object[] args, int[] argTypes)
public SqlRowSet queryForRowSet_SqlRowSet() {
String sql = "Select e.Emp_Id,e.Emp_No,e.Emp_Name From Employee e " //
+ " Where e.Hire_Date > ? and e.Salary > ? ";
//
Date hireDate = getDateByYear(1981);
Object[] args = new Object[] { hireDate, 2800 };
int[] argTypes = new int[] { Types.DATE, Types.DOUBLE };
// SqlRowSet queryForRowSet(String sql, Object[] args, int[] argTypes)
SqlRowSet rowSet = this.getJdbcTemplate().queryForRowSet(sql, args, argTypes);
return rowSet;
}
private Date getDateByYear(int year) {
java.sql.Date date = new java.sql.Date(System.currentTimeMillis());
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DAY_OF_YEAR, 1);
return c.getTime();
}
}QueryForRowSetReturnSqlRowSet_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryForRowSetReturnSqlRowSetDAO;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.jdbc.support.rowset.SqlRowSet;
public class QueryForRowSetReturnSqlRowSet_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryForRowSetReturnSqlRowSetDAO dao = context.getBean(QueryForRowSetReturnSqlRowSetDAO.class);
// SqlRowSet
SqlRowSet rowSet = dao.queryForRowSet_SqlRowSet();
while (rowSet.next()) {
System.out.println("-----");
Long empId = rowSet.getLong("Emp_Id"); // Index = 1
String empNo = rowSet.getString(2); // Index = 2
String empName = rowSet.getString("Emp_Name"); // Index = 3
System.out.println("EmpID: " + empId + ", EmpNo: " + empNo + ", EmpName:" + empName);
}
}
}Output:
-----
EmpID: 7839, EmpNo: E7839, EmpName:KING
-----
EmpID: 7566, EmpNo: E7566, EmpName:JONES
-----
EmpID: 7902, EmpNo: E7902, EmpName:FORD
-----
EmpID: 7698, EmpNo: E7698, EmpName:BLAKE
...5. JdbcTemplate.query & RowMapper
No ADS
// query methods with RowMapper & returns List
public <T> List<T> query(String sql, Object[] args,
int[] argTypes, RowMapper<T> rowMapper) throws DataAccessException;
public <T> List<T> query(String sql, Object[] args,
RowMapper<T> rowMapper) throws DataAccessException;
public <T> List<T> query(String sql, RowMapper<T> rowMapper,
Object... args) throws DataAccessException;JdbcTemplate shows some query methods and the return result is a list of Java objects. You need to provide a RowMapper defining mappings between columns and fields of class.
QueryWithRowMapperDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.sql.DataSource;
import org.o7planning.springjdbc.model.Department;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryWithRowMapperDAO extends JdbcDaoSupport {
@Autowired
public QueryWithRowMapperDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
private static final String BASE_SQL = //
"Select d.Dept_Id, d.Dept_No, d.Dept_Name from Department d ";
class DepartmentRowMapper implements RowMapper<Department> {
@Override
public Department mapRow(ResultSet rs, int rowNum) throws SQLException {
Long deptId = rs.getLong("Dept_Id");
String deptNo = rs.getString("Dept_No");
String deptName = rs.getString("Dept_Name");
return new Department(deptId, deptNo, deptName);
}
}
public List<Department> queryDepartment() {
String sql = BASE_SQL //
+ " Where d.Dept_Id > ? ";
DepartmentRowMapper rowMapper = new DepartmentRowMapper();
Object[] args = new Object[] { 20 };
List<Department> list = this.getJdbcTemplate().query(sql, args, rowMapper);
return list;
}
}Test:
QueryWithRowMapper_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import java.util.List;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryWithRowMapperDAO;
import org.o7planning.springjdbc.model.Department;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class QueryWithRowMapper_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryWithRowMapperDAO dao = context.getBean(QueryWithRowMapperDAO.class);
List<Department> list = dao.queryDepartment() ;
for(Department dept: list) {
System.out.println("DeptNo: "+ dept.getDeptNo()+" - DeptName: "+ dept.getDeptName());
}
}
}Output:
DeptNo: D30 - DeptName: SALES
DeptNo: D40 - DeptName: OPERATIONS
DeptNo: D41 - DeptName: HR
DeptNo: D42 - DeptName: INV6. JdbcTemplate.query & RowCallbackHandler
No ADS
JdbcTemplate provides you with some methods that help you to query data and manipulate the data via ResultSet. Below are such methods:
// JdbcTemplate.query methods & RowCallbackHandler.
public void query(PreparedStatementCreator psc,
RowCallbackHandler rch) throws DataAccessException;
public void query(String sql, PreparedStatementSetter pss,
RowCallbackHandler rch) throws DataAccessException;
public void query(String sql, Object[] args, int[] argTypes,
RowCallbackHandler rch) throws DataAccessException;
public void query(String sql, Object[] args,
RowCallbackHandler rch) throws DataAccessException;
public void query(String sql, RowCallbackHandler rch,
Object... args) throws DataAccessException;RowCallbackHandler interface:
** RowCallbackHandler **
public interface RowCallbackHandler {
void processRow(ResultSet rs) throws SQLException;
}Example:
QueryWithRowCallbackHandlerDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryWithRowCallbackHandlerDAO extends JdbcDaoSupport {
@Autowired
public QueryWithRowCallbackHandlerDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
public void queryEmployee() {
String sql = "Select e.Emp_Id, e.Emp_No, e.Emp_Name,e.Salary from Employee e "//
+ " Where e.Salary > ? ";
RowCallbackHandler handler = new RowCallbackHandler() {
@Override
public void processRow(ResultSet rs) throws SQLException {
Long empId = rs.getLong("Emp_Id");
String empNo = rs.getString(2);
System.out.println(" ---------------- ");
System.out.println("EmpId:" + empId);
System.out.println("EmpNo:" + empNo);
}
};
// query(String sql, RowCallbackHandler rch, Object... args)
this.getJdbcTemplate().query(sql, handler, 2800);
}
}QueryWithRowCallbackHandler_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryWithRowCallbackHandlerDAO;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class QueryWithRowCallbackHandler_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryWithRowCallbackHandlerDAO dao = context.getBean(QueryWithRowCallbackHandlerDAO.class);
dao.queryEmployee();
}
}Output:
----------------
EmpId:7839
EmpNo:E7839
----------------
EmpId:7566
EmpNo:E7566
...7. JdbcTemplate.query & ResultSetExtractor
No ADS
// JdbcTemplate.query methods with ResultSetExtractor.
public <T> T query(PreparedStatementCreator psc,
ResultSetExtractor<T> rse) throws DataAccessException;
public <T> T query(String sql, PreparedStatementSetter pss,
ResultSetExtractor<T> rse) throws DataAccessException;
public <T> T query(String sql, Object[] args, int[] argTypes,
ResultSetExtractor<T> rse) throws DataAccessException;
public <T> T query(String sql, Object[] args,
ResultSetExtractor<T> rse) throws DataAccessException;
public <T> T query(String sql, ResultSetExtractor<T> rse,
Object... args) throws DataAccessException;Example:
QueryWithResultSetExtractorDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import org.o7planning.springjdbc.model.Department;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryWithResultSetExtractorDAO extends JdbcDaoSupport {
@Autowired
public QueryWithResultSetExtractorDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
private static final String BASE_SQL = //
"Select d.Dept_Id, d.Dept_No, d.Dept_Name from Department d ";
class DepartmentListResultSetExtractor implements ResultSetExtractor<List<Department>> {
@Override
public List<Department> extractData(ResultSet rs) throws SQLException, DataAccessException {
List<Department> list = new ArrayList<Department>();
while (rs.next()) {
Long deptId = rs.getLong("Dept_Id");
String deptNo = rs.getString("Dept_No");
String deptName = rs.getString("Dept_Name");
list.add(new Department(deptId, deptNo, deptName));
}
return list;
}
}
class DepartmentResultSetExtractor implements ResultSetExtractor<Department> {
@Override
public Department extractData(ResultSet rs) throws SQLException, DataAccessException {
if (rs.next()) {
Long deptId = rs.getLong("Dept_Id");
String deptNo = rs.getString("Dept_No");
String deptName = rs.getString("Dept_Name");
return new Department(deptId, deptNo, deptName);
}
return null;
}
}
public List<Department> queryDepartments() {
String sql = BASE_SQL //
+ " Where d.Dept_Id > ? ";
DepartmentListResultSetExtractor rse = new DepartmentListResultSetExtractor();
// <T> T query(String sql, ResultSetExtractor<T> rse, Object... args)
List<Department> list = this.getJdbcTemplate().query(sql, rse, 40);
return list;
}
public Department findDepartment(Long deptId) {
String sql = BASE_SQL //
+ " Where d.Dept_Id = ? ";
DepartmentResultSetExtractor rse = new DepartmentResultSetExtractor();
// <T> T query(String sql, ResultSetExtractor<T> rse, Object... args)
Department dept = this.getJdbcTemplate().query(sql, rse, 40);
return dept;
}
}8. JdbcTemplate.queryForObject
// JdbcTemplate.queryForObject methods:
public <T> T queryForObject(String sql, Object[] args,
int[] argTypes, RowMapper<T> rowMapper)
throws DataAccessException;
public <T> T queryForObject(String sql, Object[] args,
RowMapper<T> rowMapper) throws DataAccessException;
public <T> T queryForObject(String sql, RowMapper<T> rowMapper,
Object... args) throws DataAccessException;
public <T> T queryForObject(String sql, Object[] args,
int[] argTypes, Class<T> requiredType)
throws DataAccessException;
public <T> T queryForObject(String sql, Object[] args,
Class<T> requiredType) throws DataAccessException;
public <T> T queryForObject(String sql, Class<T> requiredType,
Object... args) throws DataAccessException;Example:
QueryForObjectDAO.java
package org.o7planning.springjdbc.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Date;
import javax.sql.DataSource;
import org.o7planning.springjdbc.model.Department;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class QueryForObjectDAO extends JdbcDaoSupport {
@Autowired
public QueryForObjectDAO(DataSource dataSource) {
this.setDataSource(dataSource);
}
private static final String BASE_SQL = //
"Select d.Dept_Id, d.Dept_No, d.Dept_Name from Department d ";
class DepartmentRowMapper implements RowMapper<Department> {
@Override
public Department mapRow(ResultSet rs, int rowNum) throws SQLException {
Long deptId = rs.getLong("Dept_Id");
String deptNo = rs.getString("Dept_No");
String deptName = rs.getString("Dept_Name");
return new Department(deptId, deptNo, deptName);
}
}
public Department getDepartment(String deptNo) {
try {
String sql = BASE_SQL //
+ " Where d.Dept_No = ? ";
DepartmentRowMapper rowMapper = new DepartmentRowMapper();
Object[] args = new Object[] { deptNo };
Department dept = this.getJdbcTemplate().queryForObject(sql, args, rowMapper);
return dept;
} catch (EmptyResultDataAccessException e) {
return null;
}
}
public String getDeptNameById(Long deptId) {
try {
String sql = "Select d.Dept_Name from Department d "//
+ " Where d.Dept_Id = ?";
Object[] args = new Object[] { deptId };
String deptName = this.getJdbcTemplate().queryForObject(sql, String.class, args);
return deptName;
} catch (EmptyResultDataAccessException e) {
return null;
}
}
public Date getEmpHireDateById(Long empId) {
try {
String sql = "Select e.Hire_Date from Employee e "//
+ " Where e.Emp_Id = ?";
Object[] args = new Object[] { empId };
int[] argTypes = new int[] { Types.BIGINT };
Date hireDate = this.getJdbcTemplate().queryForObject(sql, args, argTypes, Date.class);
return hireDate;
} catch (EmptyResultDataAccessException e) {
return null;
}
}
}Test:
QueryForObject_Test.java
package org.o7planning.springjdbc.demo;
import java.sql.SQLException;
import java.util.Date;
import org.o7planning.springjdbc.config.AppConfiguration;
import org.o7planning.springjdbc.dao.QueryForObjectDAO;
import org.o7planning.springjdbc.model.Department;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class QueryForObject_Test {
public static void main(String[] args) throws SQLException {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfiguration.class);
QueryForObjectDAO dao = context.getBean(QueryForObjectDAO.class);
System.out.println(" ------------- ");
Department dept = dao.getDepartment("D20");
if (dept != null) {
System.out.println("DeptNo: " + dept.getDeptNo() + " - DeptName: " + dept.getDeptName());
} else {
System.out.println("Department not found!");
}
System.out.println(" ------------- ");
String deptName = dao.getDeptNameById(30L);
System.out.println("Dept Name by Id 30: " + deptName);
System.out.println(" ------------- ");
Date hireDate = dao.getEmpHireDateById(7839L);
System.out.println("HireDate by EmpId 7839: " + hireDate);
}
}Output:
-------------
DeptNo: D20 - DeptName: RESEARCH
-------------
Dept Name by Id 30: SALES
-------------
HireDate by EmpId 7839: 1981-11-17 00:00:00.0No ADS
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