1、使用JdbcTemplate的execute()方法执行SQL语句
1. jdbcTemplate.execute("CREATE TABLE USER (user_id integer, name varchar(100))");
2、如果是UPDATE或INSERT,可以用update()方法。
1. jdbcTemplate.update("INSERT INTO USER VALUES('"
2. "', '"
3. "', '"
4. "', '"
5. "')");
3、带参数的更新
1. jdbcTemplate.update("UPDATE USER SET name = ? WHERE user_id = ?", new Object[] {name, id});
1. jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)", new Object[] {user.getId(), user.getName(), user.getSex(), user.getAge()});
4、使用JdbcTemplate进行查询时,使用queryForXXX()等方法
Java代码
1. int count = jdbcTemplate.queryForInt("SELECT COUNT(*) FROM USER");
1. String name = (String) jdbcTemplate.queryForObject("SELECT name FROM USER WHERE user_id = ?", new Object[] {id}, java.lang.String.class);
Java代码
1. List rows = jdbcTemplate.queryForList("SELECT * FROM USER");
1. List rows = jdbcTemplate.queryForList("SELECT * FROM USER");
2. Iterator it = rows.iterator();
3. while(it.hasNext()) {
4. Map userMap = (Map) it.next();
5. "user_id") + "\t");
6. "name") + "\t");
7. "sex") + "\t");
8. "age") + "\t");
9. }
JdbcTemplate将我们使用的JDBC的流程封装起来,包括了异常的捕捉、SQL的执行、查询结果的转换等等。spring大量使用Template Method模式来封装固定流程的动作,XXXTemplate等类别都是基于这种方式的实现。
除了大量使用Template Method来封装一些底层的操作细节,spring也大量使用callback方式类回调相关类别的方法以提供JDBC相关类别的功能,使传统的JDBC的使用者也能清楚了解spring所提供的相关封装类别方法的使用。
JDBC的PreparedStatement
1. final String id = user.getId();
2. final String name = user.getName();
3. final String sex = user.getSex() + "";
4. final int age = user.getAge();
5.
6. jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)",
7. new PreparedStatementSetter() {
8. public void setValues(PreparedStatement ps) throws SQLException {
9. 1, id);
10. 2, name);
11. 3, sex);
12. 4, age);
13. }
14. });
1. final User user = new User();
2. jdbcTemplate.query("SELECT * FROM USER WHERE user_id = ?",
3. new Object[] {id},
4. new RowCallbackHandler() {
5. public void processRow(ResultSet rs) throws SQLException {
6. "user_id"));
7. "name"));
8. "sex").charAt(0));
9. "age"));
10. }
11. });
1. class UserRowMapper implements RowMapper {
2. public Object mapRow(ResultSet rs, int index) throws SQLException {
3. new User();
4.
5. "user_id"));
6. "name"));
7. "sex").charAt(0));
8. "age"));
9.
10. return user;
11. }
12. }
13.
14. public List findAllByRowMapperResultReader() {
15. "SELECT * FROM USER";
16. return jdbcTemplate.query(sql, new RowMapperResultReader(new UserRowMapper()));
17. }
在getUser(id)里面使用UserRowMapper
1. public User getUser(final String id) throws DataAccessException {
2. "SELECT * FROM USER WHERE user_id=?";
3. final Object[] params = new Object[] { id };
4. new RowMapperResultReader(new UserRowMapper()));
5.
6. return (User) list.get(0);
7. }
网上收集
org.springframework.jdbc.core.PreparedStatementCreator 返回预编译SQL 不能于Object[]一起用
1. public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
2. return con.prepareStatement(sql);
3. }
1.增删改
org.springframework.jdbc.core.JdbcTemplate 类(必须指定数据源dataSource)
1. template.update("insert into web_person values(?,?,?)",Object[]);
或
1. template.update("insert into web_person values(?,?,?)",new PreparedStatementSetter(){ 匿名内部类 只能访问外部最终局部变量
2.
3. public void setValues(PreparedStatement ps) throws SQLException {
4. 3);
5. });
org.springframework.jdbc.core.PreparedStatementSetter 接口 处理预编译SQL
Java代码
1. public void setValues(PreparedStatement ps) throws SQLException {
2. 3);
3. }
2.查询JdbcTemplate.query(String,[Object[]/PreparedStatementSetter],RowMapper/RowCallbackHandler)
org.springframework.jdbc.core.RowMapper 记录映射接口 处理结果集
1. public Object mapRow(ResultSet rs, int arg1) throws SQLException { int表当前行数
2. "id"));
3. }
4. List template.query("select * from web_person where id=?",Object[],RowMapper);
org.springframework.jdbc.core.RowCallbackHandler 记录回调管理器接口 处理结果集
1. template.query("select * from web_person where id=?",Object[],new RowCallbackHandler(){
2. public void processRow(ResultSet rs) throws SQLException {
3. "id"));
4. });