/// <summary>检查字段改变。某些数据库（如SQLite）没有添删改字段的DDL语法，可重载该方法，使用重建表方法ReBuildTable</summary>
/// <param name="entitytable"></param>
/// <param name="dbtable"></param>
/// <param name="onlySql"></param>
/// <param name="noDelete"></param>
/// <returns></returns>
protected virtual String CheckColumnsChange(IDataTable entitytable, IDataTable dbtable, Boolean onlySql, Boolean noDelete)
{
//var onlySql = mode <= Migration.ReadOnly;
//var noDelete = mode < Migration.Full;
var sb = new StringBuilder();
var etdic = entitytable.Columns.ToDictionary(e => e.ColumnName.ToLower(), e => e, StringComparer.OrdinalIgnoreCase);
var dbdic = dbtable.Columns.ToDictionary(e => e.ColumnName.ToLower(), e => e, StringComparer.OrdinalIgnoreCase);
#region 新增列
foreach (var item in entitytable.Columns)
{
if (!dbdic.ContainsKey(item.ColumnName.ToLower()))
{
// 非空字段需要重建表
if (!item.Nullable)
{
//var sql = ReBuildTable(entitytable, dbtable);
//if (noDelete)
//{
// WriteLog("数据表新增非空字段[{0}]，需要重建表，请手工执行：\r\n{1}", item.Name, sql);
// return sql;
//}
//Database.CreateSession().Execute(sql);
//return String.Empty;
// 非空字段作为可空字段新增，避开重建表
item.Nullable = true;
}
PerformSchema(sb, onlySql, DDLSchema.AddColumn, item);
if (!item.Description.IsNullOrEmpty())
{
PerformSchema(sb, onlySql, DDLSchema.AddColumnDescription, item);
}
}
}
#endregion
#region 除列
var sbDelete = new StringBuilder();
for (var i = dbtable.Columns.Count - 1; i >= 0; i--)
{
var item = dbtable.Columns[i];
if (!etdic.ContainsKey(item.ColumnName.ToLower()))
{
if (!String.IsNullOrEmpty(item.Description))
{
PerformSchema(sb, onlySql || noDelete, DDLSchema.DropColumnDescription, item);
}
PerformSchema(sbDelete, onlySql || noDelete, DDLSchema.DropColumn, item);
}
}
if (sbDelete.Length > 0)
{
if (noDelete)
{
// 不许删除列，显示日志
WriteLog("数据表中发现有多余字段，请手工执行以下语句删除：" + Environment.NewLine + sbDelete);
}
else
{
if (sb.Length > 0)
{
sb.AppendLine(";");
}
sb.Append(sbDelete);
}
}
#endregion
#region 修改列
// 开发时的实体数据库
var entityDb = DbFactory.Create(entitytable.DbType);
foreach (var item in entitytable.Columns)
{
if (!dbdic.TryGetValue(item.ColumnName, out var dbf))
{
continue;
}
if (IsColumnTypeChanged(item, dbf))
{
WriteLog("字段{0}.{1}类型需要由数据库的{2}改变为实体的{3}", entitytable.Name, item.Name, dbf.DataType, item.DataType);
PerformSchema(sb, noDelete, DDLSchema.AlterColumn, item, dbf);
}
if (IsColumnChanged(item, dbf, entityDb))
{
PerformSchema(sb, noDelete, DDLSchema.AlterColumn, item, dbf);
}
//if (item.Description + "" != dbf.Description + "")
if (FormatDescription(item.Description) != FormatDescription(dbf.Description))
{
// 先删除旧注释
//if (dbf.Description != null) PerformSchema(sb, noDelete, DDLSchema.DropColumnDescription, dbf);
// 加上新注释
if (!item.Description.IsNullOrEmpty())
{
PerformSchema(sb, onlySql, DDLSchema.AddColumnDescription, item);
}
}
}
#endregion
return(sb.ToString());
}
/// <summary>检查字段改变。某些数据库（如SQLite）没有添删改字段的DDL语法，可重载该方法，使用重建表方法ReBuildTable</summary>
/// <param name="entitytable"></param>
/// <param name="dbtable"></param>
/// <param name="setting"></param>
/// <returns></returns>
protected virtual String CheckColumnsChange(IDataTable entitytable, IDataTable dbtable, NegativeSetting setting)
{
#region 准备工作
var onlySql = setting.CheckOnly;
var sql = String.Empty;
var sb = new StringBuilder();
var entitydic = new Dictionary <String, IDataColumn>(StringComparer.OrdinalIgnoreCase);
if (entitytable.Columns != null)
{
foreach (var item in entitytable.Columns)
{
if (entitydic.ContainsKey(item.ColumnName.ToLower()))
{
WriteLog("《" + entitytable.Name + "》实体中存在重复列名，请检查《" + entitytable.TableName + "》表《" + item.Name + "》属性的ColumnName配置（目前配置为：" + item.ColumnName + "）。");
continue;
}
entitydic.Add(item.ColumnName.ToLower(), item);
}
}
var dbdic = new Dictionary <String, IDataColumn>(StringComparer.OrdinalIgnoreCase);
if (dbtable.Columns != null)
{
foreach (var item in dbtable.Columns)
{
dbdic.Add(item.ColumnName.ToLower(), item);
}
}
#endregion
#region 新增列
foreach (IDataColumn item in entitytable.Columns)
{
if (!dbdic.ContainsKey(item.ColumnName.ToLower()))
{
//AddColumn(sb, item, onlySql);
PerformSchema(sb, onlySql, DDLSchema.AddColumn, item);
if (!String.IsNullOrEmpty(item.Description))
{
PerformSchema(sb, onlySql, DDLSchema.AddColumnDescription, item);
}
//! 以下已经不需要了，目前只有SQLite会采用重建表的方式添加删除字段。如果这里提前添加了字段，重建表的时候，会导致失败。
//// 这里必须给dbtable加加上当前列，否则下面如果刚好有删除列的话，会导致增加列成功，然后删除列重建表的时候没有新加的列
//dbtable.Columns.Add(item.Clone(dbtable));
}
}
#endregion
#region 除列
var sbDelete = new StringBuilder();
for (Int32 i = dbtable.Columns.Count - 1; i >= 0; i--)
{
var item = dbtable.Columns[i];
if (!entitydic.ContainsKey(item.ColumnName.ToLower()))
{
if (!String.IsNullOrEmpty(item.Description))
{
PerformSchema(sb, onlySql, DDLSchema.DropColumnDescription, item);
}
PerformSchema(sbDelete, setting.NoDelete, DDLSchema.DropColumn, item);
}
}
if (sbDelete.Length > 0)
{
if (setting.NoDelete)
{
//不许删除列，显示日志
WriteLog("数据表中发现有多余字段，请手工执行以下语句删除：" + Environment.NewLine + sbDelete.ToString());
}
else
{
if (sb.Length > 0)
{
sb.AppendLine(";");
}
sb.Append(sbDelete.ToString());
}
}
#endregion
#region 修改列
// 开发时的实体数据库
var entityDb = DbFactory.Create(entitytable.DbType);
foreach (var item in entitytable.Columns)
{
IDataColumn dbf = null;
if (!dbdic.TryGetValue(item.ColumnName, out dbf))
{
continue;
}
if (IsColumnTypeChanged(item, dbf))
{
WriteLog("字段{0}.{1}类型需要由{2}改变为{3}", entitytable.Name, item.Name, dbf.DataType, item.DataType);
PerformSchema(sb, onlySql, DDLSchema.AlterColumn, item, dbf);
}
if (IsColumnChanged(item, dbf, entityDb))
{
PerformSchema(sb, onlySql, DDLSchema.AlterColumn, item, dbf);
}
if (IsColumnDefaultChanged(item, dbf, entityDb))
{
ChangeColmnDefault(sb, onlySql, item, dbf, entityDb);
}
if (item.Description + "" != dbf.Description + "")
{
// 先删除旧注释
//if (!String.IsNullOrEmpty(dbf.Description)) DropColumnDescription(sb, dbf, onlySql);
//if (!String.IsNullOrEmpty(dbf.Description)) PerformSchema(sb, onlySql, DDLSchema.DropColumnDescription, dbf);
if (dbf.Description != null)
{
PerformSchema(sb, onlySql, DDLSchema.DropColumnDescription, dbf);
}
// 加上新注释
if (!String.IsNullOrEmpty(item.Description))
{
PerformSchema(sb, onlySql, DDLSchema.AddColumnDescription, item);
}
}
}
#endregion
return(sb.ToString());
}