JdbcBaseDao

JdbcBaseDao接口，內容如下：

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(); }

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JdbcBaseDaoImpl 實現

JdbcBaseDao接口，內容如下：

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實現類是：" + 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; } /** * 組裝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 代表主鍵 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(); } /** * 設置參數 * * @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 !=

轉載于:https://www.cnblogs.com/hujihon/p/5560599.html

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