protected override void LoadAllColumns(Database database)
{
foreach (Table table in database.Tables)
{
using (var columnsReader = this.Db.QueryDataReader(
@"SELECT * FROM user_tab_columns WHERE TABLE_NAME = {0}",
table.Name))
{
while (columnsReader.Read())
{
string columnName = columnsReader["COLUMN_NAME"].ToString();
string sqlType = columnsReader["DATA_TYPE"].ToString().ToLower();
if (sqlType == "number")
{
var dataScale = columnsReader["DATA_SCALE"].ToString();
if (dataScale == "0")
{
sqlType = "integer";
}
}
DbType dbType = OracleDbTypeHelper.ConvertFromOracleTypeString(sqlType);
Column column = new Column(columnName, dbType, null, table);
column.IsRequired = columnsReader["NULLABLE"].ToString() == "N";
table.Columns.Add(column);
}
table.SortColumns();
}
}
}
protected override void LoadAllColumns(Database database)
{
//用一句 Sql 将所有的表的所有字段都一次性查询出来。
var sql = new StringBuilder(
@"SELECT * FROM USER_TAB_COLUMNS WHERE TABLE_NAME IN (");
sql.Append(string.Join(",", database.Tables.Select(t => "'" + t.Name + "'")));
sql.Append(@")
ORDER BY TABLE_NAME");
using (var columnsReader = this.Db.QueryDataReader(sql.ToString()))
{
Table currentTable = null;//当前正在处理的表。（放在循环外，有缓存的作用。）
while (columnsReader.Read())
{
//找到该列所对应的表。
var tableName = columnsReader["TABLE_NAME"].ToString();
if (currentTable == null || !currentTable.Name.EqualsIgnoreCase(tableName))
{
currentTable = database.FindTable(tableName);
}
string columnName = columnsReader["COLUMN_NAME"].ToString();
string sqlType = columnsReader["DATA_TYPE"].ToString().ToLower();
if (sqlType == "number")
{
var dataScale = columnsReader["DATA_SCALE"].ToString();
if (dataScale == "0")
{
sqlType = "integer";
}
}
DbType dbType = OracleDbTypeHelper.ConvertFromOracleTypeString(sqlType);
Column column = new Column(columnName, dbType, null, currentTable);
column.IsRequired = columnsReader["NULLABLE"].ToString() == "N";
currentTable.Columns.Add(column);
}
}
}
protected override string ConvertToTypeString(DbType dataType, string length)
{
return(OracleDbTypeHelper.ConvertToOracleTypeString(dataType, length));
}
