JdbcTemplate使用
/**
* @Description:
* 简单的自定义sql拼接类，用来明确描述拼接sql的行为
*/
@Component
@Scope(value = "prototype")
public class SQLString implements Serializable ,Cloneable{
static final long serialVersionUID = 1213885877147921107L;
private StringBuffer sqlSentence;
@Autowired
private JdbcTemplate jdbcTemplate;
@Autowired
private OracleDialect oracleDialect;
@Autowired
private MysqlDialect mysqlDialect;
/** 默认数据库类型*/
@Value("${}")
private String databaseType;
private SqlDialect sqlDialect;
public SQLString() {
this.sqlSentence = new StringBuffer();
}
public SQLString append(String str){
this.sqlSentence.append(str);
return this;
}
public SQLString before(String str){
this.sqlSentence.insert(0,str);
return this;
}
public SQLString arround(String prefix,String suffix){
this.sqlSentence.insert(0,prefix);
this.sqlSentence.insert(this.sqlSentence.length(),suffix);
return this;
}
public SQLString count() {
setSqlModel();
sqlDialect.count(this.clone());
return this;
}
public SQLString limit(Integer offset, Integer startIndex) {
return null;
}
public SQLString paging(Integer pageNo, Integer pageSize) {
System.out.println("--------------------"+databaseType);
setSqlModel();
sqlDialect.paging(this.clone(),pageNo,pageSize);
return this;
}
public SQLString countIf(String where) {
return null;
}
/**
* @param rowMapper
* @return List<T>
* @notice
* 映射实体查询方法
*/
public <T> List<T> query(BeanPropertyRowMapper<T> rowMapper){
List<T> result = jdbcTemplate.query(getSqlSentence().toString(), rowMapper);
return result;
}
/**
* @param
* @return List<Map<String,Object>>
* @notice
* 直接查询List方法
*/
public List<Map<String,Object>> queryForList(){
return jdbcTemplate.queryForList(getSqlSentence().toString());
}
public int queryForCount(){
Map<String, Object> map = jdbcTemplate.queryForMap(getSqlSentence().toString());
Integer count = Integer.valueOf(map.get("count")+"");
return count;
}
public void setSqlModel(){
if(databaseType.equals(DatabaseType.ORACLE)){
this.sqlDialect = oracleDialect;
}
if(databaseType.equals(DatabaseType.MYSQL)){
this.sqlDialect = mysqlDialect;
}
}
@Override
public String toString(){
return this.sqlSentence.toString();
}
public int length(){
return this.sqlSentence.length();
}
public boolean isEmpty(){
return this.sqlSentence==null||this.sqlSentence.length()==0;
}
public void clean(){
setSqlSentence(new StringBuffer());
}
public SQLString where(String... conditions){
if(conditions == null||conditions.length==0)
throw new IllegalParametersException("conditions is null or empty");
String con = "";
for (String condition :conditions) {
con += " "+condition+" and";
}
String connew = con.substring(0, con.length() - 3);
this.sqlSentence.append("where "+connew);
return this;
}
/**深拷贝，利用序列化和反序列化实现 使用 apache的jar 的工具类实现
* 对象中使用了 jdbcTemplate 此对象没有实现序列化接口 故不可以深拷贝*/
public SQLString deepClone() {
SQLString clone = null;
try{
clone = SerializationUtils.clone(this);
}catch(Exception e) {
e.printStackTrace();
}
return clone;
}
@Override
public SQLString clone(){
SQLString clone = null;
try{
clone = (SQLString)super.clone();
}catch(Exception e) {
e.printStackTrace();
}
return clone;
}
public void execute(){
jdbcTemplate.execute(getSqlSentence().toString());
}
public void changeDatabaseType(String databaseType){
setDatabaseType(databaseType);
}
public StringBuffer getSqlSentence() {
return sqlSentence;
}
public void setSqlSentence(StringBuffer sqlSentence) {
this.sqlSentence = sqlSentence;
}
public String getDatabaseType() {
return databaseType;
}
public void setDatabaseType(String databaseType) {
this.databaseType = databaseType;
}
public SqlDialect getSqlDialect() {
return sqlDialect;
}
public void setSqlDialect(SqlDialect sqlDialect) {
this.sqlDialect = sqlDialect;
}
}