using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using XCode.Common;
namespace XCode.DataAccessLayer
{
class Oracle : RemoteDb
{
#region 属性
/// <summary>返回数据库类型。外部DAL数据库类请使用Other</summary>
public override DatabaseType DbType { get { return DatabaseType.Oracle; } }
private static DbProviderFactory _dbProviderFactory;
/// <summary>提供者工厂</summary>
static DbProviderFactory dbProviderFactory
{
get
{
// 首先尝试使用Oracle.DataAccess
if (_dbProviderFactory == null)
{
lock (typeof(Oracle))
{
if (_dbProviderFactory == null)
{
try
{
var fileName = "Oracle.ManagedDataAccess.dll";
_dbProviderFactory = GetProviderFactory(fileName, "Oracle.ManagedDataAccess.Client.OracleClientFactory");
if (_dbProviderFactory != null && DAL.Debug)
{
var asm = _dbProviderFactory.GetType().Assembly;
if (DAL.Debug) DAL.WriteLog("Oracle使用文件驱动{0} 版本v{1}", asm.Location, asm.GetName().Version);
}
}
catch (FileNotFoundException) { }
catch (Exception ex)
{
if (DAL.Debug) DAL.WriteLog(ex.ToString());
}
}
// 以下三种方式都可以加载，前两种只是为了减少对程序集的引用，第二种是为了避免第一种中没有注册
if (_dbProviderFactory == null)
{
_dbProviderFactory = DbProviderFactories.GetFactory("System.Data.OracleClient");
if (_dbProviderFactory != null && DAL.Debug) DAL.WriteLog("Oracle使用配置驱动{0}", _dbProviderFactory.GetType().Assembly.Location);
}
}
}
return _dbProviderFactory;
}
}
/// <summary>工厂</summary>
public override DbProviderFactory Factory { get { return dbProviderFactory; } }
private String _UserID;
/// <summary>用户名UserID</summary>
public String UserID
{
get
{
if (_UserID != null) return _UserID;
_UserID = String.Empty;
String connStr = ConnectionString;
if (String.IsNullOrEmpty(connStr)) return null;
var ocsb = Factory.CreateConnectionStringBuilder();
ocsb.ConnectionString = connStr;
if (ocsb.ContainsKey("User ID")) _UserID = (String)ocsb["User ID"];
return _UserID;
}
}
/// <summary>拥有者</summary>
public override String Owner
{
get
{
// 利用null和Empty的区别来判断是否已计算
if (base.Owner == null)
{
base.Owner = UserID;
if (String.IsNullOrEmpty(base.Owner)) base.Owner = String.Empty;
}
return base.Owner;
}
set { base.Owner = value; }
}
protected override void OnSetConnectionString(XDbConnectionStringBuilder builder)
{
String str = null;
// 获取OCI目录
if (builder.TryGetAndRemove("DllPath", out str) && !String.IsNullOrEmpty(str))
{
}
}
#endregion
#region 方法
/// <summary>创建数据库会话</summary>
/// <returns></returns>
protected override IDbSession OnCreateSession()
{
return new OracleSession();
}
/// <summary>创建元数据对象</summary>
/// <returns></returns>
protected override IMetaData OnCreateMetaData()
{
return new OracleMeta();
}
public override bool Support(string providerName)
{
providerName = providerName.ToLower();
if (providerName.Contains("oracleclient")) return true;
if (providerName.Contains("oracle")) return true;
return false;
}
#endregion
#region 分页
/// <summary>已重写。获取分页 2012.9.26 HUIYUE修正分页BUG</summary>
/// <param name="sql">SQL语句</param>
/// <param name="startRowIndex">开始行，0表示第一行</param>
/// <param name="maximumRows">最大返回行数，0表示所有行</param>
/// <param name="keyColumn">主键列。用于not in分页</param>
/// <returns></returns>
public override String PageSplit(String sql, Int32 startRowIndex, Int32 maximumRows, String keyColumn)
{
// 从第一行开始
if (startRowIndex <= 0)
{
if (maximumRows > 0) sql = String.Format("Select * From ({1}) XCode_Temp_a Where rownum<={0}", maximumRows, sql);
}
else
{
if (maximumRows <= 0)
sql = String.Format("Select * From ({1}) XCode_Temp_a Where rownum>={0}", startRowIndex, sql);
else
sql = String.Format("Select * From (Select XCode_Temp_a.*, rownum as rowNumber From ({1}) XCode_Temp_a Where rownum<={2}) XCode_Temp_b Where rowNumber>={0}", startRowIndex, sql, startRowIndex + maximumRows - 1);
}
return sql;
}
/// <summary>构造分页SQL</summary>
/// <remarks>
/// 两个构造分页SQL的方法，区别就在于查询生成器能够构造出来更好的分页语句，尽可能的避免子查询。
/// MS体系的分页精髓就在于唯一键，当唯一键带有Asc/Desc/Unkown等排序结尾时，就采用最大最小值分页，否则使用较次的TopNotIn分页。
/// TopNotIn分页和MaxMin分页的弊端就在于无法完美的支持GroupBy查询分页，只能查到第一页，往后分页就不行了，因为没有主键。
/// </remarks>
/// <param name="builder">查询生成器</param>
/// <param name="startRowIndex">开始行，0表示第一行</param>
/// <param name="maximumRows">最大返回行数，0表示所有行</param>
/// <returns>分页SQL</returns>
public override SelectBuilder PageSplit(SelectBuilder builder, Int32 startRowIndex, Int32 maximumRows)
{
// 从第一行开始，不需要分页
if (startRowIndex <= 0)
{
if (maximumRows > 0) builder = builder.AsChild("XCode_Temp_a").AppendWhereAnd("rownum<={0}", maximumRows);
return builder;
}
if (maximumRows < 1) return builder.AsChild("XCode_Temp_a").AppendWhereAnd("rownum>={0}", startRowIndex);
builder = builder.AsChild("XCode_Temp_a").AppendWhereAnd("rownum<={0}", startRowIndex + maximumRows - 1);
builder.Column = "XCode_Temp_a.*, rownum as rowNumber";
builder = builder.AsChild("XCode_Temp_b").AppendWhereAnd("rowNumber>={0}", startRowIndex);
return builder;
}
#endregion
#region 数据库特性
/// <summary>当前时间函数</summary>
public override string DateTimeNow { get { return "sysdate"; } }
/// <summary>获取Guid的函数</summary>
public override String NewGuid { get { return "sys_guid()"; } }
/// <summary>已重载。格式化时间</summary>
/// <param name="dateTime"></param>
/// <returns></returns>
public override String FormatDateTime(DateTime dateTime) { return "To_Date('" + dateTime.ToFullString() + "', 'YYYY-MM-DD HH24:MI:SS')"; }
//public override string FormatDateTime(DateTime dateTime)
//{
// return String.Format("To_Date('{0}', 'YYYY-MM-DD HH24:MI:SS')", dateTime.ToString("yyyy-MM-dd HH:mm:ss"));
//}
public override string FormatValue(IDataColumn field, object value)
{
TypeCode code = Type.GetTypeCode(field.DataType);
Boolean isNullable = field.Nullable;
if (code == TypeCode.String)
{
if (value == null) return isNullable ? "null" : "''";
//云飞扬：这里注释掉，应该返回''而不是null字符
//if (String.IsNullOrEmpty(value.ToString()) && isNullable) return "null";
if (field.IsUnicode || IsUnicode(field.RawType))
return "N'" + value.ToString().Replace("'", "''") + "'";
else
return "'" + value.ToString().Replace("'", "''") + "'";
}
return base.FormatValue(field, value);
}
/// <summary>格式化标识列，返回插入数据时所用的表达式，如果字段本身支持自增，则返回空</summary>
/// <param name="field">字段</param>
/// <param name="value">数值</param>
/// <returns></returns>
public override string FormatIdentity(IDataColumn field, Object value)
{
return String.Format("SEQ_{0}.nextval", field.Table.TableName);
}
internal protected override String ParamPrefix { get { return ":"; } }
/// <summary>字符串相加</summary>
/// <param name="left"></param>
/// <param name="right"></param>
/// <returns></returns>
public override String StringConcat(String left, String right) { return (!String.IsNullOrEmpty(left) ? left : "\'\'") + "||" + (!String.IsNullOrEmpty(right) ? right : "\'\'"); }
#endregion
#region 关键字
protected override string ReservedWordsStr
{
get { return "Sort,Level,ALL,ALTER,AND,ANY,AS,ASC,BETWEEN,BY,CHAR,CHECK,CLUSTER,COMPRESS,CONNECT,CREATE,DATE,DECIMAL,DEFAULT,DELETE,DESC,DISTINCT,DROP,ELSE,EXCLUSIVE,EXISTS,FLOAT,FOR,FROM,GRANT,GROUP,HAVING,IDENTIFIED,IN,INDEX,INSERT,INTEGER,INTERSECT,INTO,IS,LIKE,LOCK,LONG,MINUS,MODE,NOCOMPRESS,NOT,NOWAIT,NULL,NUMBER,OF,ON,OPTION,OR,ORDER,PCTFREE,PRIOR,PUBLIC,RAW,RENAME,RESOURCE,REVOKE,SELECT,SET,SHARE,SIZE,SMALLINT,START,SYNONYM,TABLE,THEN,TO,TRIGGER,UNION,UNIQUE,UPDATE,VALUES,VARCHAR,VARCHAR2,VIEW,WHERE,WITH"; }
}
/// <summary>格式化关键字</summary>
/// <param name="keyWord">表名</param>
/// <returns></returns>
public override String FormatKeyWord(String keyWord)
{
//return String.Format("\"{0}\"", keyWord);
//if (String.IsNullOrEmpty(keyWord)) throw new ArgumentNullException("keyWord");
if (String.IsNullOrEmpty(keyWord)) return keyWord;
Int32 pos = keyWord.LastIndexOf(".");
if (pos < 0) return "\"" + keyWord + "\"";
String tn = keyWord.Substring(pos + 1);
if (tn.StartsWith("\"")) return keyWord;
return keyWord.Substring(0, pos + 1) + "\"" + tn + "\"";
}
/// <summary>是否忽略大小写，如果不忽略则在表名字段名外面加上双引号</summary>
static Boolean _IgnoreCase = Setting.Current.Oracle.IgnoreCase;
public override string FormatName(string name)
{
if (_IgnoreCase)
return base.FormatName(name);
else
return FormatKeyWord(name);
}
#endregion
#region 辅助
Dictionary<String, DateTime> cache = new Dictionary<String, DateTime>();
public Boolean NeedAnalyzeStatistics(String tableName)
{
var key = String.Format("{0}.{1}", Owner, tableName);
DateTime dt;
if (!cache.TryGetValue(key, out dt))
{
dt = DateTime.MinValue;
cache[key] = dt;
}
if (dt > DateTime.Now) return false;
// 一分钟后才可以再次分析
dt = DateTime.Now.AddSeconds(10);
cache[key] = dt;
return true;
}
#endregion
}
/// <summary>Oracle数据库</summary>
internal class OracleSession : RemoteDbSession
{
static OracleSession()
{
// 旧版Oracle运行时会因为没有这个而报错
String name = "NLS_LANG";
if (String.IsNullOrEmpty(Environment.GetEnvironmentVariable(name))) Environment.SetEnvironmentVariable(name, "SIMPLIFIED CHINESE_CHINA.ZHS16GBK");
}
#region 基本方法 查询/执行
/// <summary>快速查询单表记录数，稍有偏差</summary>
/// <param name="tableName"></param>
/// <returns></returns>
public override Int64 QueryCountFast(string tableName)
{
if (String.IsNullOrEmpty(tableName)) return 0;
Int32 p = tableName.LastIndexOf(".");
if (p >= 0 && p < tableName.Length - 1) tableName = tableName.Substring(p + 1);
tableName = tableName.ToUpper();
var owner = (Database as Oracle).Owner.ToUpper();
String sql = String.Format("analyze table {0}.{1} compute statistics", owner, tableName);
if ((Database as Oracle).NeedAnalyzeStatistics(tableName)) Execute(sql);
sql = String.Format("select NUM_ROWS from sys.all_indexes where TABLE_OWNER='{0}' and TABLE_NAME='{1}' and UNIQUENESS='UNIQUE'", owner, tableName);
return ExecuteScalar<Int64>(sql);
}
static Regex reg_SEQ = new Regex(@"\b(\w+)\.nextval\b", RegexOptions.IgnoreCase | RegexOptions.Compiled);
/// <summary>执行插入语句并返回新增行的自动编号</summary>
/// <param name="sql">SQL语句</param>
/// <param name="type">命令类型，默认SQL文本</param>
/// <param name="ps">命令参数</param>
/// <returns>新增行的自动编号</returns>
public override Int64 InsertAndGetIdentity(String sql, CommandType type = CommandType.Text, params DbParameter[] ps)
{
var b = IsAutoClose;
// 禁用自动关闭，保证两次在同一会话
IsAutoClose = false;
BeginTransaction();
try
{
Int64 rs = Execute(sql, type, ps);
if (rs > 0)
{
var m = reg_SEQ.Match(sql);
if (m != null && m.Success && m.Groups != null && m.Groups.Count > 0)
rs = ExecuteScalar<Int64>(String.Format("Select {0}.currval From dual", m.Groups[1].Value));
}
Commit();
return rs;
}
catch { Rollback(true); throw; }
finally
{
IsAutoClose = b;
AutoClose();
}
}
#endregion
}
/// <summary>Oracle元数据</summary>
class OracleMeta : RemoteDbMetaData
{
/// <summary>拥有者</summary>
public String Owner { get { return (Database as Oracle).Owner.ToUpper(); } }
/// <summary>是否限制只能访问拥有者的信息</summary>
Boolean IsUseOwner { get { return Setting.Current.Oracle.UseOwner; } }
/// <summary>取得所有表构架</summary>
/// <returns></returns>
protected override List<IDataTable> OnGetTables(ICollection<String> names)
{
DataTable dt = null;
// 采用集合过滤，提高效率
String tableName = null;
if (names != null && names.Count > 0) tableName = names.FirstOrDefault();
if (String.IsNullOrEmpty(tableName))
tableName = null;
else
tableName = tableName.ToUpper();
if (IsUseOwner)
{
dt = GetSchema(_.Tables, new String[] { Owner, tableName });
dt.Columns.Add("TABLE_TYPE", Type.GetType("System.String"));
foreach (DataRow dr in dt.Rows)
{
dr["TABLE_TYPE"] = "Table";
}
DataTable dtView = GetSchema(_.Views, new String[] { Owner, tableName });
if (dtView != null && dtView.Rows.Count != 0)
{
foreach (DataRow dr in dtView.Rows)
{
DataRow drNew = dt.NewRow();
drNew["OWNER"] = dr["OWNER"];
drNew["TABLE_NAME"] = dr["VIEW_NAME"];
drNew["TABLE_TYPE"] = "View";
dt.Rows.Add(drNew);
}
}
if (_columns == null) _columns = GetSchema(_.Columns, new String[] { Owner, tableName, null });
if (_indexes == null) _indexes = GetSchema(_.Indexes, new String[] { Owner, null, Owner, tableName });
if (_indexColumns == null) _indexColumns = GetSchema(_.IndexColumns, new String[] { Owner, null, Owner, tableName, null });
}
else
{
if (String.IsNullOrEmpty(tableName))
dt = GetSchema(_.Tables, null);
else
dt = GetSchema(_.Tables, new String[] { null, tableName });
}
// 默认列出所有字段
DataRow[] rows = OnGetTables(names, dt.Rows);
if (rows == null || rows.Length < 1) return null;
return GetTables(rows);
}
protected override void FixTable(IDataTable table, DataRow dr)
{
base.FixTable(table, dr);
// 主键
if (MetaDataCollections.Contains(_.PrimaryKeys))
{
DataTable dt = null;
if (IsUseOwner)
dt = GetSchema(_.PrimaryKeys, new String[] { Owner, table.TableName, null });
else
dt = GetSchema(_.PrimaryKeys, new String[] { null, table.TableName, null });
if (dt != null && dt.Rows.Count > 0)
{
// 找到主键所在索引，这个索引的列才是主键
String name = null;
if (TryGetDataRowValue<String>(dt.Rows[0], _.IndexName, out name) && !String.IsNullOrEmpty(name))
{
IDataIndex di = table.Indexes.FirstOrDefault(i => i.Name == name);
if (di != null)
{
di.PrimaryKey = true;
foreach (IDataColumn dc in table.Columns)
{
dc.PrimaryKey = di.Columns.Contains(dc.ColumnName);
}
}
}
}
}
// 表注释 USER_TAB_COMMENTS
//String sql = String.Format("Select COMMENTS From USER_TAB_COMMENTS Where TABLE_NAME='{0}'", table.Name);
//String comment = (String)Database.CreateSession().ExecuteScalar(sql);
String comment = GetTableComment(table.TableName);
if (!String.IsNullOrEmpty(comment)) table.Description = comment;
if (table == null || table.Columns == null || table.Columns.Count < 1) return;
// 自增
Boolean exists = false;
foreach (IDataColumn field in table.Columns)
{
// 不管是否主键
if (!field.DataType.IsIntType()) continue;
String name = String.Format("SEQ_{0}_{1}", table.TableName, field.ColumnName);
if (CheckSeqExists(name))
{
field.Identity = true;
exists = true;
break;
}
}
if (!exists)
{
// 检查该表是否有序列，如有，让主键成为自增
String name = String.Format("SEQ_{0}", table.TableName);
if (CheckSeqExists(name))
{
foreach (IDataColumn field in table.Columns)
{
if (!field.PrimaryKey || !field.DataType.IsIntType()) continue;
field.Identity = true;
exists = true;
break;
}
}
}
//if (!exists)
//{
// // 处理自增，整型、主键、名为ID认为是自增
// foreach (IDataColumn field in table.Columns)
// {
// if (field.DataType.IsIntType())
// {
// if (field.PrimaryKey && field.ColumnName.ToLower().Contains("id")) field.Identity = true;
// }
// }
//}
}
/// <summary>序列</summary>
DataTable dtSequences;
/// <summary>检查序列是否存在</summary>
/// <param name="name">名称</param>
/// <returns></returns>
Boolean CheckSeqExists(String name)
{
if (dtSequences == null)
{
DataSet ds = null;
if (IsUseOwner)
ds = Database.CreateSession().Query("SELECT * FROM ALL_SEQUENCES Where SEQUENCE_OWNER='" + Owner + "'");
else
ds = Database.CreateSession().Query("SELECT * FROM ALL_SEQUENCES");
if (ds != null && ds.Tables != null && ds.Tables.Count > 0)
dtSequences = ds.Tables[0];
else
dtSequences = new DataTable();
}
if (dtSequences.Rows == null || dtSequences.Rows.Count < 1) return false;
String where = null;
if (IsUseOwner)
where = String.Format("SEQUENCE_NAME='{0}' And SEQUENCE_OWNER='{1}'", name, Owner);
else
where = String.Format("SEQUENCE_NAME='{0}'", name);
DataRow[] drs = dtSequences.Select(where);
return drs != null && drs.Length > 0;
//String sql = String.Format("SELECT Count(*) FROM ALL_SEQUENCES Where SEQUENCE_NAME='{0}' And SEQUENCE_OWNER='{1}'", name, Owner);
//return Convert.ToInt32(Database.CreateSession().ExecuteScalar(sql)) > 0;
}
DataTable dtTableComment;
String GetTableComment(String name)
{
if (dtTableComment == null)
{
DataSet ds = Database.CreateSession().Query("SELECT * FROM USER_TAB_COMMENTS");
if (ds != null && ds.Tables != null && ds.Tables.Count > 0)
dtTableComment = ds.Tables[0];
else
dtTableComment = new DataTable();
}
if (dtTableComment.Rows == null || dtTableComment.Rows.Count < 1) return null;
String where = String.Format("TABLE_NAME='{0}'", name);
DataRow[] drs = dtTableComment.Select(where);
if (drs != null && drs.Length > 0) return Convert.ToString(drs[0]["COMMENTS"]);
return null;
//String sql = String.Format("Select COMMENTS From USER_TAB_COMMENTS Where TABLE_NAME='{0}'", table.Name);
//String comment = (String)Database.CreateSession().ExecuteScalar(sql);
}
/// <summary>取得指定表的所有列构架</summary>
/// <param name="table"></param>
/// <returns></returns>
protected override List<IDataColumn> GetFields(IDataTable table)
{
List<IDataColumn> list = base.GetFields(table);
if (list == null || list.Count < 1) return null;
// 字段注释
if (list != null && list.Count > 0)
{
foreach (IDataColumn field in list)
{
field.Description = GetColumnComment(table.TableName, field.ColumnName);
}
#region 2013.6.27 上海石头 添加，发现在 Oracle11 中，反向工程无法扫描到默认值
foreach (IDataColumn field in list)
{
field.Default = GetColumnDefault(table.TableName, field.ColumnName);
}
#endregion
}
return list;
}
const String KEY_OWNER = "OWNER";
protected override List<IDataColumn> GetFields(IDataTable table, DataRow[] rows)
{
if (rows == null || rows.Length < 1) return null;
if (String.IsNullOrEmpty(Owner) || !rows[0].Table.Columns.Contains(KEY_OWNER)) return base.GetFields(table, rows);
List<DataRow> list = new List<DataRow>();
foreach (DataRow dr in rows)
{
String str = null;
if (TryGetDataRowValue<String>(dr, KEY_OWNER, out str) && Owner.EqualIgnoreCase(str)) list.Add(dr);
}
return base.GetFields(table, list.ToArray());
}
DataTable dtColumnComment;
String GetColumnComment(String tableName, String columnName)
{
if (dtColumnComment == null)
{
DataSet ds = Database.CreateSession().Query("SELECT * FROM USER_COL_COMMENTS");
if (ds != null && ds.Tables != null && ds.Tables.Count > 0)
dtColumnComment = ds.Tables[0];
else
dtColumnComment = new DataTable();
}
if (dtColumnComment.Rows == null || dtColumnComment.Rows.Count < 1) return null;
String where = String.Format("{0}='{1}' AND {2}='{3}'", _.TalbeName, tableName, _.ColumnName, columnName);
DataRow[] drs = dtColumnComment.Select(where);
if (drs != null && drs.Length > 0) return Convert.ToString(drs[0]["COMMENTS"]);
return null;
}
DataTable dtColumnDefault;
/// <summary>获取默认值信息</summary>
/// <param name="tableName"></param>
/// <param name="columnName"></param>
/// <returns></returns>
String GetColumnDefault(String tableName, String columnName)
{
if (dtColumnDefault == null)
{
DataSet ds = Database.CreateSession().Query("SELECT * FROM USER_TAB_COLS");
if (ds != null && ds.Tables != null && ds.Tables.Count > 0)
dtColumnDefault = ds.Tables[0];
else
dtColumnDefault = new DataTable();
}
if (dtColumnDefault.Rows == null || dtColumnDefault.Rows.Count < 1) return null;
String where = String.Format("{0}='{1}' AND {2}='{3}'", _.TalbeName, tableName, _.ColumnName, columnName);
DataRow[] drs = dtColumnDefault.Select(where);
string result = null;
if (drs == null || drs.Length == 0) return null;
result = Convert.ToString(drs[0]["DATA_DEFAULT"]); //如果默认值中最后一个字符是 \n ,则排除掉
if (result.EndsWith("\n") == true && result.Length > "\n".Length)
result = result.Substring(0, result.Length - "\n".Length);
else
result = null;
return result;
}
protected override void FixField(IDataColumn field, DataRow drColumn, DataRow drDataType)
{
base.FixField(field, drColumn, drDataType);
// 处理数字类型
if (field.RawType.StartsWith("NUMBER"))
{
if (field.Scale == 0)
{
// 0表示长度不限制，为了方便使用，转为最常见的Int32
if (field.Precision == 0)
field.DataType = typeof(Int32);
else if (field.Precision == 1)
field.DataType = typeof(Boolean);
else if (field.Precision <= 5)
field.DataType = typeof(Int16);
else if (field.Precision <= 10)
field.DataType = typeof(Int32);
else
field.DataType = typeof(Int64);
}
else
{
if (field.Precision == 0)
field.DataType = typeof(Decimal);
else if (field.Precision <= 5)
field.DataType = typeof(Single);
else if (field.Precision <= 10)
field.DataType = typeof(Double);
}
}
// 长度
Int32 len = 0;
if (TryGetDataRowValue<Int32>(drColumn, "LENGTHINCHARS", out len) && len > 0) field.Length = len;
// 字节数
len = 0;
if (TryGetDataRowValue<Int32>(drColumn, "LENGTH", out len) && len > 0) field.NumOfByte = len;
}
protected override string GetFieldType(IDataColumn field)
{
Int32 precision = field.Precision;
Int32 scale = field.Scale;
switch (Type.GetTypeCode(field.DataType))
{
case TypeCode.Boolean:
return "NUMBER(1, 0)";
case TypeCode.Int16:
case TypeCode.UInt16:
if (precision <= 0) precision = 5;
return String.Format("NUMBER({0}, 0)", precision);
case TypeCode.Int32:
case TypeCode.UInt32:
//if (precision <= 0) precision = 10;
if (precision <= 0) return "NUMBER";
return String.Format("NUMBER({0}, 0)", precision);
case TypeCode.Int64:
case TypeCode.UInt64:
if (precision <= 0) precision = 20;
return String.Format("NUMBER({0}, 0)", precision);
case TypeCode.Single:
if (precision <= 0) precision = 5;
if (scale <= 0) scale = 1;
return String.Format("NUMBER({0}, {1})", precision, scale);
case TypeCode.Double:
if (precision <= 0) precision = 10;
if (scale <= 0) scale = 2;
return String.Format("NUMBER({0}, {1})", precision, scale);
case TypeCode.Decimal:
if (precision <= 0) precision = 20;
if (scale <= 0) scale = 4;
return String.Format("NUMBER({0}, {1})", precision, scale);
default:
break;
}
return base.GetFieldType(field);
}
protected override DataRow[] FindDataType(IDataColumn field, string typeName, bool? isLong)
{
DataRow[] drs = base.FindDataType(field, typeName, isLong);
if (drs != null && drs.Length > 1)
{
// 字符串
if (typeName == typeof(String).FullName)
{
foreach (DataRow dr in drs)
{
String name = GetDataRowValue<String>(dr, "TypeName");
if ((name == "NVARCHAR2" && field.IsUnicode || name == "VARCHAR2" && !field.IsUnicode) && field.Length <= Database.LongTextLength)
return new DataRow[] { dr };
else if ((name == "NCLOB" && field.IsUnicode || name == "LONG" && !field.IsUnicode) && field.Length > Database.LongTextLength)
return new DataRow[] { dr };
}
}
//// 时间日期
//if (typeName == typeof(DateTime).FullName)
//{
// // DateTime的范围是0001到9999
// // Timestamp的范围是1970到2038
// String d = CheckAndGetDefaultDateTimeNow(field.Table.DbType, field.Default);
// foreach (DataRow dr in drs)
// {
// String name = GetDataRowValue<String>(dr, "TypeName");
// if (name == "DATETIME" && String.IsNullOrEmpty(field.Default))
// return new DataRow[] { dr };
// else if (name == "TIMESTAMP" && (d == "now()" || field.Default == "CURRENT_TIMESTAMP"))
// return new DataRow[] { dr };
// }
//}
}
return drs;
}
protected override void FixIndex(IDataIndex index, DataRow dr)
{
String str = null;
if (TryGetDataRowValue<String>(dr, "UNIQUENESS", out str))
index.Unique = str == "UNIQUE";
base.FixIndex(index, dr);
}
#region 架构定义
public override object SetSchema(DDLSchema schema, params object[] values)
{
IDbSession session = Database.CreateSession();
String dbname = String.Empty;
String databaseName = String.Empty;
switch (schema)
{
case DDLSchema.DatabaseExist:
// Oracle不支持判断数据库是否存在
return true;
default:
break;
}
return base.SetSchema(schema, values);
}
public override string DatabaseExistSQL(string dbname)
{
return String.Empty;
}
protected override string GetFieldConstraints(IDataColumn field, bool onlyDefine)
{
// 有默认值时直接返回，待会在默认值里面加约束
// 因为Oracle的声明是先有默认值再有约束的
if (!String.IsNullOrEmpty(field.Default)) return null;
//return base.GetFieldConstraints(field, onlyDefine);
if (field.Nullable)
return " NULL";
else
return " NOT NULL";
}
protected override string GetFieldDefault(IDataColumn field, bool onlyDefine)
{
if (String.IsNullOrEmpty(field.Default)) return null;
return base.GetFieldDefault(field, onlyDefine) + base.GetFieldConstraints(field, onlyDefine);
}
public override string CreateTableSQL(IDataTable table)
{
var Fields = new List<IDataColumn>(table.Columns);
Fields.OrderBy(dc => dc.ID);
var sb = new StringBuilder(32 + Fields.Count * 20);
sb.AppendFormat("Create Table {0}(", FormatName(table.TableName));
for (var i = 0; i < Fields.Count; i++)
{
sb.AppendLine();
sb.Append("\t");
sb.Append(FieldClause(Fields[i], true));
if (i < Fields.Count - 1) sb.Append(",");
}
// 主键
var pks = table.PrimaryKeys;
if (pks != null && pks.Length > 0)
{
sb.AppendLine(",");
sb.Append("\t");
sb.AppendFormat("constraint pk_{0} primary key (", table.TableName);
for (int i = 0; i < pks.Length; i++)
{
if (i > 0) sb.Append(",");
sb.Append(FormatName(pks[i].ColumnName));
}
sb.Append(")");
}
sb.AppendLine();
sb.Append(")");
String sql = sb.ToString();
if (String.IsNullOrEmpty(sql)) return sql;
// 感谢@晴天（412684802）和@老徐（gregorius 279504479），这里的最小和开始必须是0，插入的时候有++i的效果，才会得到从1开始的编号
String sqlSeq = String.Format("Create Sequence SEQ_{0} Minvalue 0 Maxvalue 9999999999 Start With 0 Increment By 1 Cache 20", table.TableName);
//return sql + "; " + Environment.NewLine + sqlSeq;
// 去掉分号后的空格，Oracle不支持同时执行多个语句
return sql + ";" + Environment.NewLine + sqlSeq;
}
public override string DropTableSQL(String tableName)
{
String sql = base.DropTableSQL(tableName);
if (String.IsNullOrEmpty(sql)) return sql;
String sqlSeq = String.Format("Drop Sequence SEQ_{0}", tableName);
return sql + "; " + Environment.NewLine + sqlSeq;
}
public override String AddColumnSQL(IDataColumn field)
{
if (String.IsNullOrEmpty(Owner))
return String.Format("Alter Table {0} Add {1}", FormatName(field.Table.TableName), FieldClause(field, true));
else
return String.Format("Alter Table {2}.{0} Add {1}", FormatName(field.Table.TableName), FieldClause(field, true), Owner);
}
public override String AlterColumnSQL(IDataColumn field, IDataColumn oldfield)
{
if (String.IsNullOrEmpty(Owner))
return String.Format("Alter Table {0} Modify {1}", FormatName(field.Table.TableName), FieldClause(field, false));
else
return String.Format("Alter Table {2}.{0} Modify {1}", FormatName(field.Table.TableName), FieldClause(field, false), Owner);
}
public override String DropColumnSQL(IDataColumn field)
{
if (String.IsNullOrEmpty(Owner))
return String.Format("Alter Table {0} Drop Column {1}", FormatName(field.Table.TableName), field.ColumnName);
else
return String.Format("Alter Table {2}.{0} Drop Column {1}", FormatName(field.Table.TableName), field.ColumnName, Owner);
}
public override string AddTableDescriptionSQL(IDataTable table)
{
//return String.Format("Update USER_TAB_COMMENTS Set COMMENTS='{0}' Where TABLE_NAME='{1}'", table.Description, table.Name);
return String.Format("Comment On Table {0} is '{1}'", FormatName(table.TableName), table.Description);
}
public override string DropTableDescriptionSQL(IDataTable table)
{
//return String.Format("Update USER_TAB_COMMENTS Set COMMENTS='' Where TABLE_NAME='{0}'", table.Name);
return String.Format("Comment On Table {0} is ''", FormatName(table.TableName));
}
public override string AddColumnDescriptionSQL(IDataColumn field)
{
//return String.Format("Update USER_COL_COMMENTS Set COMMENTS='{0}' Where TABLE_NAME='{1}' AND COLUMN_NAME='{2}'", field.Description, field.Table.Name, field.Name);
return String.Format("Comment On Column {0}.{1} is '{2}'", FormatName(field.Table.TableName), FormatName(field.ColumnName), field.Description);
}
public override string DropColumnDescriptionSQL(IDataColumn field)
{
//return String.Format("Update USER_COL_COMMENTS Set COMMENTS='' Where TABLE_NAME='{0}' AND COLUMN_NAME='{1}'", field.Table.Name, field.Name);
return String.Format("Comment On Column {0}.{1} is ''", FormatName(field.Table.TableName), FormatName(field.ColumnName));
}
#endregion
}
}
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