JdbcTemplate中封装的方法

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JdbcTemplate中的封装了很多实用的方法。

首先来介绍一下用JdbcTemplate来查询数据的方法。

1.返回指定对象类型的List (query方法)

Java代码

Java代码

public List getProductModle(String value) throws DataAccessException {
List resultList = new ArrayList();
List args = new ArrayList();
String sql = "select F_CPUT_MOD_ID as id ,F_CPUT_MOD_NAME as name from CPUT_MOD_T"+
" WHERE F_MARKET_LOCA_ID = ? order by F_CPUT_MOD_ID";
if(StringUtils.isNotEmpty(value)){
args.add(value);
}
resultList = this.getJdbcTemplate().query(sql,args.toArray(),
new ProductModleRowMapper());
return resultList;
}
private class ProductModleRowMapper implements RowMapper{
public Object mapRow(final ResultSet rs, final int rowNum) throws SQLException {
ProductModleVO vo = new ProductModleVO();
vo.setProModleId((String)rs.getString("id"));
vo.setProModleName((String)rs.getString("name"));
return vo;
}
}

public List getProductModle(String value) throws DataAccessException { List resultList = new ArrayList(); List args = new ArrayList(); String sql = "select F_CPUT_MOD_ID as id ,F_CPUT_MOD_NAME as name from CPUT_MOD_T"+ " WHERE F_MARKET_LOCA_ID = ? order by F_CPUT_MOD_ID"; if(StringUtils.isNotEmpty(value)){ args.add(value); } resultList = this.getJdbcTemplate().query(sql,args.toArray(), new ProductModleRowMapper()); return resultList; } private class ProductModleRowMapper  implements  RowMapper{

这里实现了RowMapper类的mapRow方法，用来把查询到的结果集用指定的类来封装，最后返回一个List，List中装着

我们自定的值对象。

2.返回指定类型的结果 (queryForObject方法)

Java代码

public String getCurrentPhase(String arg) throws DataAccessException {
String currentPhase = "";
String sql="select F_CURR_YEAR from COMPETITION_BASE_T where F_COMPETITION_ID=?";
Object[] o ={arg};
try {
currentPhase = (String)this.getJdbcTemplate().queryForObject(sql,o, String.class);
} catch (Exception e) {
currentPhase = "";
e.printStackTrace();
}
return currentPhase;
}

public String getCurrentPhase(String arg) throws DataAccessException { String currentPhase = ""; String sql="select F_CURR_YEAR from COMPETITION_BASE_T where F_COMPETITION_ID=?"; Object[] o ={arg}; try { currentPhase = (String)this.getJdbcTemplate().queryForObject(sql,o, String.class); } catch (Exception e) { currentPhase = ""; e.printStackTrace(); } return currentPhase; }

在这个例子中，用到了queryForObject这个方法，其中第一个参数是要执行的sql，第二个参数是Object数组类型（其中装的是sql脚本用到

的参数），第三个参数就是要制定返回结果的类型（这里我定义的是String类型）

3.查询结果返回Int类型 (queryForInt方法)

Java代码

public boolean doCheckCompete(Map args) throws DataAccessException {
....省略代码
Object[] args = new Object[]{
companyId,
competitionId,
marketType,
martID,
currentPhase
};
StringBuffer sql = new StringBuffer();
sql.append("SELECT COUNT ( * ) ");
sql.append("FROM BEFOR_ORDER_T t ");
sql.append("WHERE T.F_COMPANY_ID = ? ");
sql.append(" and T.F_COMPETITION_ID=? ");
sql.append(" and T.F_MARKET_LOCA_ID=? ");
sql.append(" and T.F_MARKET_SCOPE_ID=? ");
sql.append(" and T.F_CURRENT_PHASE = ? ");
int i=0;
i = this.getJdbcTemplate().queryForInt(sql.toString(), args);
if(i>0){
return true;
}
return false;
}

public boolean doCheckCompete(Map args) throws DataAccessException { ....省略代码 Object[] args = new Object[]{ companyId, competitionId, marketType, martID, currentPhase }; StringBuffer sql = new StringBuffer(); sql.append("SELECT COUNT ( * ) "); sql.append("FROM BEFOR_ORDER_T t "); sql.append("WHERE T.F_COMPANY_ID = ? "); sql.append(" and T.F_COMPETITION_ID=? "); sql.append(" and T.F_MARKET_LOCA_ID=? "); sql.append(" and T.F_MARKET_SCOPE_ID=? "); sql.append(" and T.F_CURRENT_PHASE = ? "); int i=0; i = this.getJdbcTemplate().queryForInt(sql.toString(), args); if(i>0){ return true; } return false; }

这里用的是queryForInt方法返回int类型。

4.查询结果返回Map类型 (queryForMap方法)

Java代码

String sql = "select T.F_COMPETE_ORDER_STATE ,T.F_GENERATED_ORDERS " +
"from COMPETITION_BASE_T t " +
"where T.F_COMPETITION_ID = ?";
Map state = (Map)this.getJdbcTemplate().queryForMap(sql,new Object[]{args});
String compete_order_state = state.get("F_COMPETE_ORDER_STATE").toString();
String generated_orders = state.get("F_GENERATED_ORDERS").toString();

String sql = "select T.F_COMPETE_ORDER_STATE ,T.F_GENERATED_ORDERS " + "from COMPETITION_BASE_T t " + "where T.F_COMPETITION_ID = ?"; Map state = (Map)this.getJdbcTemplate().queryForMap(sql,new Object[]{args}); String compete_order_state = state.get("F_COMPETE_ORDER_STATE").toString(); String generated_orders = state.get("F_GENERATED_ORDERS").toString();

返回后的map中的键值对应的是select语句中的字段名字。

5.查询结果集直接返回list (queryForList方法)

Java代码

List list = new ArrayList();
String sql="select T.F_OFF_PERIOD,T.F_PROBABILITY from ORDER_OFF_PERIOD_T t "+
"where T.F_COMPETITION_ID=?";
Object[] args ={arg};
try {
list = this.getJdbcTemplate().queryForList(sql, args);
} catch (Exception e) {
e.printStackTrace();
}
...代码省略
String a = (String)(((Map) list.get(0)).get("F_PROBABILITY"));
String b = (String)(((Map) list.get(1)).get("F_PROBABILITY"));
String c = (String)(((Map) list.get(2)).get("F_PROBABILITY"));

List list = new ArrayList(); String sql="select T.F_OFF_PERIOD,T.F_PROBABILITY from ORDER_OFF_PERIOD_T t "+ "where T.F_COMPETITION_ID=?"; Object[] args ={arg}; try { list = this.getJdbcTemplate().queryForList(sql, args); } catch (Exception e) { e.printStackTrace(); } ...代码省略 String a = (String)(((Map) list.get(0)).get("F_PROBABILITY")); String b = (String)(((Map) list.get(1)).get("F_PROBABILITY")); String c = (String)(((Map) list.get(2)).get("F_PROBABILITY"));

返回的List中装载的是Map对象，没个map对象中的键值对应sql脚本的字段名字。

上一篇中介绍了JdbcTemplate 的一些常用的查询方法，在这篇里将介绍用JdbcTemplate做更新数据操作

和调用存储过程。

1. JdbcTemplate 更新数据

Java代码

public boolean switchStartOrderMeeting(String argument, String flag)
throws DataAccessException {
boolean result = false;
String sql =
sql = "update COMPETITION_BASE_T t set T.F_COMPETE_ORDER_STATE = '0'"+
" where T.F_COMPETITION_ID = ?";
int i = 0;
//返回所影响的行数
i = this.getJdbcTemplate().update(sql, new Object[] { argument });
if (i > 0) {
result = true;
}
return result;
}

public boolean switchStartOrderMeeting(String argument, String flag) throws DataAccessException { boolean result = false; String sql = sql = "update COMPETITION_BASE_T t set T.F_COMPETE_ORDER_STATE = '0'"+ " where T.F_COMPETITION_ID = ?"; int i = 0; //返回所影响的行数 i = this.getJdbcTemplate().update(sql, new Object[] { argument }); if (i > 0) { result = true; } return result; }

这个方法很简单，update方法只要传入sql脚本和脚本参数（Object数组类型）。

2. JdbcTemplate 调用存储过程

Java代码

//5个输入参数，3个输出参数
String sql = "{call GENERATEORDERS_P(?,?,?,?,?,?,?,?)}";
final String company_id = result.get("F_COMPANY_ID").toString(); // 公司ID
final String competition_id = result.get("F_COMPETITION_ID").toString(); // 比赛ID
final String current_phase = result.get("F_CURRENT_PHASE").toString(); // 当前周期
final String market_scope_id = result.get("F_MARKET_SCOPE_ID").toString(); // 市场ID
final String market_loca_id = result.get("F_MARKET_LOCA_ID").toString(); // 产品类型ID
Map mapR = (Map) getJdbcTemplate().execute(sql,new CallableStatementCallback() {
public Object doInCallableStatement(CallableStatement cs)throws SQLException,DataAccessException {
cs.setString(1, current_phase); // 输入参数
cs.setString(2, competition_id); // 输入参数
cs.setString(3, market_scope_id); // 输入参数
cs.setString(4, market_loca_id); // 输入参数
cs.setString(5, company_id); // 输入参数
cs.registerOutParameter(6,Types.VARCHAR);//输出参数
cs.registerOutParameter(7,Types.VARCHAR);//输出参数
cs.registerOutParameter(8,Types.VARCHAR);//输出参数
cs.execute();
Map map = new HashMap();
map.put("RESULT", cs.getString(6)); // 订单数量
map.put("F_PRICE", cs.getString(7)); // 订单价格
map.put("F_CPUT_MOD_ID", cs.getString(8));// 产品型号ID
return map;
}
});