Posted on 2009-02-06 14:35
Java蜘蛛人 --鄭成橋 閱讀(692)
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1、使用JdbcTemplate的execute()方法執(zhí)行SQL語(yǔ)句
代碼
- jdbcTemplate.execute("CREATE TABLE USER (user_id integer, name varchar(100))");
2、如果是UPDATE或INSERT,可以用update()方法。
代碼
- jdbcTemplate.update("INSERT INTO USER VALUES('"
- + user.getId() + "', '"
- + user.getName() + "', '"
- + user.getSex() + "', '"
- + user.getAge() + "')");
3、帶參數(shù)的更新
代碼
- jdbcTemplate.update("UPDATE USER SET name = ? WHERE user_id = ?", new Object[] {name, id});
代碼
- jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)", new Object[] {user.getId(), user.getName(), user.getSex(), user.getAge()});
4、使用JdbcTemplate進(jìn)行查詢時(shí)，使用queryForXXX()等方法
代碼
- int count = jdbcTemplate.queryForInt("SELECT COUNT(*) FROM USER");
代碼
- String name = (String) jdbcTemplate.queryForObject("SELECT name FROM USER WHERE user_id = ?", new Object[] {id}, java.lang.String.class);
代碼
- List rows = jdbcTemplate.queryForList("SELECT * FROM USER");
代碼
- List rows = jdbcTemplate.queryForList("SELECT * FROM USER");
- Iterator it = rows.iterator();
- while(it.hasNext()) {
- Map userMap = (Map) it.next();
- System.out.print(userMap.get("user_id") + "\t");
- System.out.print(userMap.get("name") + "\t");
- System.out.print(userMap.get("sex") + "\t");
- System.out.println(userMap.get("age") + "\t");
- }
JdbcTemplate將我們使用的JDBC的流程封裝起來(lái)，包括了異常的捕捉、SQL的執(zhí)行、查詢結(jié)果的轉(zhuǎn)換等等。spring大量使用Template Method模式來(lái)封裝固定流程的動(dòng)作，XXXTemplate等類別都是基于這種方式的實(shí)現(xiàn)。
除了大量使用Template Method來(lái)封裝一些底層的操作細(xì)節(jié)，spring也大量使用callback方式類回調(diào)相關(guān)類別的方法以提供JDBC相關(guān)類別的功能，使傳統(tǒng)的JDBC的使用者也能清楚了解spring所提供的相關(guān)封裝類別方法的使用。
JDBC的PreparedStatement
代碼
- final String id = user.getId();
- final String name = user.getName();
- final String sex = user.getSex() + "";
- final int age = user.getAge();
-
- jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)",
- new PreparedStatementSetter() {
- public void setValues(PreparedStatement ps) throws SQLException {
- ps.setString(1, id);
- ps.setString(2, name);
- ps.setString(3, sex);
- ps.setInt(4, age);
- }
- });
-
代碼
- final User user = new User();
- jdbcTemplate.query("SELECT * FROM USER WHERE user_id = ?",
- new Object[] {id},
- new RowCallbackHandler() {
- public void processRow(ResultSet rs) throws SQLException {
- user.setId(rs.getString("user_id"));
- user.setName(rs.getString("name"));
- user.setSex(rs.getString("sex").charAt(0));
- user.setAge(rs.getInt("age"));
- }
- });
-
代碼
- class UserRowMapper implements RowMapper {
- public Object mapRow(ResultSet rs, int index) throws SQLException {
- User user = new User();
-
- user.setId(rs.getString("user_id"));
- user.setName(rs.getString("name"));
- user.setSex(rs.getString("sex").charAt(0));
- user.setAge(rs.getInt("age"));
-
- return user;
- }
- }
-
- public List findAllByRowMapperResultReader() {
- String sql = "SELECT * FROM USER";
- return jdbcTemplate.query(sql, new RowMapperResultReader(new UserRowMapper()));
- }
-
在getUser(id)里面使用UserRowMapper
代碼
- public User getUser(final String id) throws DataAccessException {
- String sql = "SELECT * FROM USER WHERE user_id=?";
- final Object[] params = new Object[] { id };
- List list = jdbcTemplate.query(sql, params, new RowMapperResultReader(new UserRowMapper()));
-
- return (User) list.get(0);
- }
網(wǎng)上收集
org.springframework.jdbc.core.PreparedStatementCreator 返回預(yù)編譯SQL 不能于Object[]一起用
代碼
- public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
- return con.prepareStatement(sql);
- }
1.增刪改
org.springframework.jdbc.core.JdbcTemplate 類(必須指定數(shù)據(jù)源dataSource)
代碼
- template.update("insert into web_person values(?,?,?)",Object[]);
或
代碼
- template.update("insert into web_person values(?,?,?)",new PreparedStatementSetter(){ 匿名內(nèi)部類 只能訪問(wèn)外部最終局部變量
-
- public void setValues(PreparedStatement ps) throws SQLException {
- ps.setInt(index++,3);
- });
org.springframework.jdbc.core.PreparedStatementSetter 接口 處理預(yù)編譯SQL
代碼
- public void setValues(PreparedStatement ps) throws SQLException {
- ps.setInt(index++,3);
- }
2.查詢JdbcTemplate.query(String,[Object[]/PreparedStatementSetter],RowMapper/RowCallbackHandler)
org.springframework.jdbc.core.RowMapper 記錄映射接口 處理結(jié)果集
代碼
- public Object mapRow(ResultSet rs, int arg1) throws SQLException { int表當(dāng)前行數(shù)
- person.setId(rs.getInt("id"));
- }
- List template.query("select * from web_person where id=?",Object[],RowMapper);
org.springframework.jdbc.core.RowCallbackHandler 記錄回調(diào)管理器接口 處理結(jié)果集
代碼
- template.query("select * from web_person where id=?",Object[],new RowCallbackHandler(){
- public void processRow(ResultSet rs) throws SQLException {
- person.setId(rs.getInt("id"));
- });