/// <summary>
/// 加载指定数据库中的每个表的所有列
/// </summary>
/// <param name="database">需要加载列的数据库对象</param>
protected override void LoadAllColumns(Database database)
{
foreach (Table table in database.Tables)
{
using (var columnsReader = this.Db.QueryDataReader(@"SHOW FULL COLUMNS FROM `" + table.Name + "`;"))
{
while (columnsReader.Read())
{
string columnName = columnsReader["Field"].ToString();
string sqlType = columnsReader["Type"].ToString();
DbType dbType = SQLiteDbTypeHelper.ConvertFromSQLiteTypeString(sqlType);
Column column = new Column(columnName, dbType, null, table);
column.IsRequired = string.Compare(columnsReader["Null"].ToString(), "Yes", true) != 0;
table.Columns.Add(column);
}
table.SortColumns();
}
}
}
/// <summary>
/// 生成更新备注信息
/// </summary>
/// <param name="op">更新备注的实体对象</param>
protected override void Generate(UpdateComment op)
{
if (string.IsNullOrEmpty(op.ColumnName))
{
this.AddRun(new SqlMigrationRun
{
Sql = string.Format(@"ALTER TABLE `{0}` COMMENT '{1}';", this.Prepare(op.TableName), op.Comment)
});
}
else
{
//SQLite 不支持外键修改备注，所以过滤掉外键修改备注
if (string.Compare(op.ColumnName, "id", true) != 0 && string.Compare(op.TableName, "BlogUser") != 0)
{
this.AddRun(new SqlMigrationRun
{
Sql = string.Format(@"ALTER TABLE `{0}` MODIFY COLUMN `{1}` {2} COMMENT '{3}';", this.Prepare(op.TableName), this.Prepare(op.ColumnName), SQLiteDbTypeHelper.ConvertToSQLiteTypeString(op.ColumnDataType), op.Comment)
});
}
}
}
/// <summary>
/// 把Clr的数据类型转型为SQLite的数据类型
/// </summary>
/// <param name="dataType">数据类型</param>
/// <param name="length">数据长度</param>
/// <returns>返回SQLite的数据类型</returns>
protected override string ConvertToTypeString(DbType dataType, string length)
{
return(SQLiteDbTypeHelper.ConvertToSQLiteTypeString(dataType, length));
}
