Spring-JDBC通用Dao
Posted jhhu
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JdbcBaseDao
JdbcBaseDao接口，内容如下：
package com.sun4j.core.jdbc.dao;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.support.rowset.SqlRowSet;
public interface JdbcBaseDao<T> {
void save(T entity);
void update(T entity);
void delete(T entity);
void delete(Serializable id);
void deleteAll();
T findById(Serializable id);
List<T> findAll();
void batchDelete(Serializable[] ids);
void batchUpdate(List<T> list);
void batchSave(List<T> list);
Map<String, Object> findOne(String sql, Object... args);
List<Map<String, Object>> findListMap(String sql, Object... args);
void execSQL(String sql);
SqlRowSet rowSet(String sql, Object... args);
JdbcTemplate getJdbcTemplate();
}
JdbcBaseDaoImpl 实现
JdbcBaseDao接口，内容如下：
package com.sun4j.core.jdbc.dao.impl;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.sql.Types;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import org.springframework.util.Assert;
import com.sun4j.core.jdbc.dao.JdbcBaseDao;
public class JdbcBaseDaoImpl<T> implements JdbcBaseDao<T> {
public static final String SQL_INSERT = "insert";
public static final String SQL_UPDATE = "update";
public static final String SQL_DELETE = "delete";
@Autowired
private JdbcTemplate jdbcTemplate;
private Class<T> entityClass;
@SuppressWarnings("unchecked")
public JdbcBaseDaoImpl() {
ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass();
entityClass = (Class<T>) type.getActualTypeArguments()[0];
System.out.println("Dao实现类是：" + entityClass.getName());
}
@Override
public void save(T entity) {
String sql = this.makeSql(SQL_INSERT);
Object[] args = this.setArgs(entity, SQL_INSERT);
int[] argTypes = this.setArgTypes(entity, SQL_INSERT);
jdbcTemplate.update(sql.toString(), args, argTypes);
}
@Override
public void update(T entity) {
String sql = this.makeSql(SQL_UPDATE);
Object[] args = this.setArgs(entity, SQL_UPDATE);
int[] argTypes = this.setArgTypes(entity, SQL_UPDATE);
jdbcTemplate.update(sql, args, argTypes);
}
@Override
public void delete(T entity) {
String sql = this.makeSql(SQL_DELETE);
Object[] args = this.setArgs(entity, SQL_DELETE);
int[] argTypes = this.setArgTypes(entity, SQL_DELETE);
jdbcTemplate.update(sql, args, argTypes);
}
@Override
public void deleteAll() {
String sql = " TRUNCATE TABLE " + entityClass.getSimpleName();
jdbcTemplate.execute(sql);
}
@Override
public void delete(Serializable id) {
String sql = " DELETE FROM " + entityClass.getSimpleName() + " WHERE id=?";
jdbcTemplate.update(sql, id);
}
@Override
public void batchSave(List<T> lt) {
Assert.notEmpty(lt);
StringBuilder sb = new StringBuilder();
sb.append("insert into ").append(entityClass.getSimpleName().toLowerCase()).append("( ");
List<Object[]> params = new ArrayList<Object[]>();
String val = "";
for (T t : lt) {
int index = 0;
Field[] fields = t.getClass().getDeclaredFields();
if (fields != null && fields.length > 0) {
Object[] objVal = new Object[fields.length];
for (Field field : fields) {
try {
field.setAccessible(true);
Object obj = field.get(t);
if (params.size() == 0) {
sb.append(field.getName()).append(" ,");
val += ", ? ";
}
objVal[index++] = obj;
} catch (Exception e) {
e.printStackTrace();
}
}
params.add(objVal);
}
}
sb.deleteCharAt(sb.length() - 1);
val = val.substring(1);
sb.append(") value (").append(val).append(")");
String sql = sb.toString();
jdbcTemplate.batchUpdate(sql, params);
}
@Override
public void batchUpdate(List<T> lt) {
Assert.notEmpty(lt);
StringBuilder sb = new StringBuilder();
sb.append("update ").append(entityClass.getSimpleName().toLowerCase()).append(" set ");
List<Object[]> params = new ArrayList<Object[]>();
Object primaryKey = "id";
for (T t : lt) {
int index = 0;
Field[] fields = entityClass.getDeclaredFields();
if (fields != null && fields.length > 0) {
Object id = null;
Object[] objVal = new Object[fields.length];
for (Field field : fields) {
try {
field.setAccessible(true);
Object obj = field.get(t);
if (field.getName().equalsIgnoreCase("id")) {
primaryKey = obj;
id = obj;
} else {
if (params.size() == 0) {
sb.append(field.getName()).append(" = ? ,");
}
objVal[index++] = obj;
}
} catch (Exception e) {
e.printStackTrace();
}
objVal[index] = id;
}
params.add(objVal);
}
}
sb.deleteCharAt(sb.length() - 1);
sb.append(" where ").append(primaryKey).append(" = ? ");
String sql = sb.toString();
jdbcTemplate.batchUpdate(sql, params);
}
@Override
public T findById(Serializable id) {
String sql = "SELECT * FROM " + entityClass.getSimpleName() + " WHERE id=?";
RowMapper<T> rowMapper = BeanPropertyRowMapper.newInstance(entityClass);
return jdbcTemplate.query(sql, rowMapper, id).get(0);
}
@Override
public List<T> findAll() {
String sql = "SELECT * FROM " + entityClass.getSimpleName();
RowMapper<T> rowMapper = BeanPropertyRowMapper.newInstance(entityClass);
return jdbcTemplate.query(sql, rowMapper);
}
@Override
public Map<String, Object> findOne(String sql, Object... args) {
return jdbcTemplate.queryForMap(sql, args);
}
@Override
public List<Map<String, Object>> findListMap(String sql, Object... args) {
return jdbcTemplate.queryForList(sql, args);
}
@Override
public void execSQL(String sql) {
jdbcTemplate.execute(sql);
}
@Override
public SqlRowSet rowSet(String sql, Object... args) {
return this.jdbcTemplate.queryForRowSet(sql, args);
}
@Override
public JdbcTemplate getJdbcTemplate() {
return jdbcTemplate;
}
/**
* 组装SQl
*
* @param entityClass
* @param sqlFlag
* @return
*/
public String makeSql(String sqlFlag) {
StringBuffer sql = new StringBuffer();
Field[] fields = entityClass.getDeclaredFields();
if (sqlFlag.equals(SQL_INSERT)) {
sql.append(" INSERT INTO " + entityClass.getSimpleName());
sql.append("(");
for (int i = 0; fields != null && i < fields.length; i++) {
fields[i].setAccessible(true); // 暴力反射
String column = fields[i].getName();
sql.append(column).append(",");
}
sql = sql.deleteCharAt(sql.length() - 1);
sql.append(") VALUES (");
for (int i = 0; fields != null && i < fields.length; i++) {
sql.append("?,");
}
sql = sql.deleteCharAt(sql.length() - 1);
sql.append(")");
} else if (sqlFlag.equals(SQL_UPDATE)) {
sql.append(" UPDATE " + entityClass.getSimpleName() + " SET ");
for (int i = 0; fields != null && i < fields.length; i++) {
fields[i].setAccessible(true); // 暴力反射
String column = fields[i].getName();
if (column.equals("id")) { // id 代表主键
continue;
}
sql.append(column).append("=").append("?,");
}
sql = sql.deleteCharAt(sql.length() - 1);
sql.append(" WHERE id=?");
} else if (sqlFlag.equals(SQL_DELETE)) {
sql.append(" DELETE FROM " + entityClass.getSimpleName() + " WHERE id=?");
}
System.out.println("SQL=" + sql);
return sql.toString();
}
/**
* 设置参数
*
* @param entity
* @param sqlFlag
* @param entityClass
* @return
*/
public Object[] setArgs(T entity, String sqlFlag) {
Field[] fields = entityClass.getDeclaredFields();
if (sqlFlag.equals(SQL_INSERT)) {
Object[] args = new Object[fields.length];
for (int i = 0; args != null && i < args.length; i++) {
try {
fields[i].setAccessible(true); // 暴力反射
args[i] = fields[i].get(entity);
} catch (Exception e) {
e.printStackTrace();
}
}
return args;
} else if (sqlFlag.equals(SQL_UPDATE)) {
Object[] tempArr = new Object[fields.length];
for (int i = 0; tempArr != null && i < tempArr.length; i++) {
try {
fields[i].setAccessible(true);