使用反射实现生成添加、修改sql语句
1.生成添加sql语句
//单独一个model时
public static string InsertSql(T t)
{
Type type = typeof(T);
string tableName = type.Name;
StringBuilder sb = new StringBuilder();
StringBuilder sb_v = new StringBuilder();
sb.Append("insert into ");
sb.Append(tableName);
sb.Append("(");
sb_v.Append(" values (");
foreach (var pi in type.GetProperties())
{
if (pi != null)
{
object[] pk = pi.GetCustomAttributes(false);
if (pk.Count() > 0)
{
Col_Attribute ca = pk[0] as Col_Attribute;
if (ca.IsPrimaryKey && ca.IsIdentity)//主键,且自增 主键不参与插入
continue;
if (ca.NotTableField) //不是表字段 不插入
continue;
}
object value = pi.GetValue(t, null);
if (value == null)
continue; //未给值，null
sb.Append("[" + pi.Name + "],");
value = CommonFunc.UnInjection(value);
if (value == null)
sb_v.Append("null" + ",");
else if (value.GetType() == typeof(int) || value.GetType() == typeof(decimal) || value.GetType() == typeof(double) || value.GetType() == typeof(long) || value.GetType() == typeof(float))
sb_v.Append(value + ",");
else
sb_v.Append("'" + value + "',");
}
}
sb.Remove(sb.Length - 1, 1);
sb.Append(")");
sb_v.Remove(sb_v.Length - 1, 1);
sb_v.Append(")");
sb.Append(sb_v);
return sb.ToString();
}
//多个model时
public static string InsertSql(List t)
{
StringBuilder sb = new StringBuilder();
sb.Append("begin ");
foreach (T item in t)
{
sb.Append(InsertSql(item));
sb.Append(";");
}
sb.Append("end;");
return sb.ToString();
} 2.生成修改sql语句
//更新一个实体
public static string UpdateSql(T t)
{
string PrimaryName = "";//主键名、值
object ParmaryValue = null;
Type type = typeof(T);
string tableName = type.Name;
StringBuilder sb = new StringBuilder();
StringBuilder sb_u = new StringBuilder();
sb.Append("update ");
sb.Append(tableName);
sb.Append(" set ");
foreach (var pi in type.GetProperties())
{
if (pi != null)
{
object value = pi.GetValue(t, null);//字段对应的值
#region 主键
object[] obj = pi.GetCustomAttributes(false);//取特性
if (obj.Count() > 0)
{
Col_Attribute ca = obj[0] as Col_Attribute;
if (ca.IsPrimaryKey)//主键
{
PrimaryName = pi.Name;
ParmaryValue = value;
continue;
}
if (ca.NotTableField) //不是表字段
continue;
}
#endregion
if (value == null) continue; //如果该字段为null不更新
value = CommonFunc.UnInjection(value);
sb_u.Append("[" + pi.Name + "]=");
if (value == null)
sb_u.Append("null" + ",");
else if (value.GetType() == typeof(int) || value.GetType() == typeof(decimal) || value.GetType() == typeof(double) || value.GetType() == typeof(long) || value.GetType() == typeof(float))
sb_u.Append(value + ",");
else
sb_u.Append("'" + value + "',");
}
}
if (string.IsNullOrEmpty(PrimaryName))
throw new Exception("需要主键(请检查表是否设置主键以及MODEL主键字段是否设置特性)");
else if (ParmaryValue == null)
throw new Exception("请检查主键值");
else if (string.IsNullOrEmpty(sb_u.ToString()))
throw new Exception("无更新");
else
{
sb_u.Remove(sb_u.Length - 1, 1);
sb.Append(sb_u);
sb.Append(" where ");
sb.Append("[" + PrimaryName + "] = " + ParmaryValue);
}
return sb.ToString();
}
//更新多个实体
public static string UpdateSql(List t)
{
StringBuilder sb = new StringBuilder();
sb.Append("begin ");
foreach (T item in t)
{
sb.Append(UpdateSql(item));
sb.Append(";");
}
sb.Append("end;");
return sb.ToString();
} 上面两种需要用CMDB插件
下面给出不需要用插件的
3，插入
///
/// Insert SQL语句
///
/// 要转换的对象，不可空
/// 要添加的表明，不可空
///
/// 空
/// sql语句
///
public static string InsertSql(T t, string tableName) where T : class
{
if (t == null || string.IsNullOrEmpty(tableName))
{
return string.Empty;
}
string columns = string.Join(",", t.GetType().GetProperties().Select(p => p.Name).ToList());
if (string.IsNullOrEmpty(columns))
{
return string.Empty;
}
string values = string.Join(",", t.GetType().GetProperties().Select(p => string.Format("'{0}'", p.GetValue(t, null))).ToArray());
if (string.IsNullOrEmpty(values))
{
return string.Empty;
}
StringBuilder sql = new StringBuilder();
sql.Append("Insert into " + tableName);
sql.Append("(" + columns + ")");
sql.Append(" values(" + values + ")");
return sql.ToString();
}
///
/// Insert SQL语句（批量添加）
///
/// 类型
/// 要转换的对象集合，不可空
/// >要添加的表明，不可空
///
/// 空
/// sql语句
///
public static string InsertSql(List objs, string tableName) where T : class
{
if (objs == null || objs.Count == 0 || string.IsNullOrEmpty(tableName))
{
return string.Empty;
}
StringBuilder sb = new StringBuilder();
sb.Append("begin ");
foreach (var item in objs)
{
sb.Append(InsertSql(item, tableName));
sb.Append(";");
}
sb.Append("end;");
return sb.ToString();
} 4，更新
///
/// Update SQL语句
///
/// 要转换的对象，不可空
/// 要添加的表明，不可空
///
/// 空
/// sql语句
///
public static string UpdateSql(T t, string tableName) where T : class
{
if (t == null || string.IsNullOrEmpty(tableName))
{
return string.Empty;
}
StringBuilder sb = new StringBuilder();
sb.Append("update ");
sb.Append(tableName);
sb.Append(" set ");
PropertyInfo[] myPropertyInfo = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
for (int i = 0; i < myPropertyInfo.Length; i++)
{
PropertyInfo pi = myPropertyInfo[i];
if (pi.Name.ToUpper() == "NUMBER" || pi.Name.ToUpper() == "TYPE")
sb.Append("\"" + pi.Name.ToUpper() + "\"");
else
sb.Append(pi.Name);
if (pi.PropertyType != typeof(DateTime))
{
sb.Append("='" + pi.GetValue(t, null) + "'");
}
else
sb.Append("=to_date('"+ pi.GetValue(t, null)+"','" + "yyyy-MM-dd HH24:MI:ss" + "')");
if (i != myPropertyInfo.Length - 1)
sb.Append(",");
}
sb.Append(" where ariid = " + myPropertyInfo[0].GetValue(t, null));
return sb.ToString();
}
///
/// Update SQL语句（批量修改）
///
/// 类型
/// 要转换的对象集合，不可空
/// >要添加的表明，不可空
///
/// 空
/// sql语句
///
public static string UpdateSql(List objs, string tableName) where T : class
{
if (objs == null || objs.Count == 0 || string.IsNullOrEmpty(tableName))
{
return string.Empty;
}
StringBuilder sb = new StringBuilder();
sb.Append("begin ");
foreach (var item in objs)
{
sb.Append(UpdateSql(item, tableName));
sb.Append(";");
}
sb.Append("commit; end;");
return sb.ToString();
}