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#region Copyright
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#endregion
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using System;
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using System.Collections;
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using System.Text;
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namespace Seasar.Dao.Dbms
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{
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public class Standard : IDbms
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{
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private Hashtable autoSelectFromClauseCache = new Hashtable();
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public Standard()
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{
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}
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public virtual string Suffix
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{
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get { return ""; }
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}
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public virtual KindOfDbms Dbms
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{
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get { return KindOfDbms.None; }
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}
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public string GetAutoSelectSql(IBeanMetaData beanMetaData)
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{
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StringBuilder buf = new StringBuilder(100);
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buf.Append(beanMetaData.AutoSelectList);
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buf.Append(" ");
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string beanName = beanMetaData.BeanType.Name;
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lock(autoSelectFromClauseCache)
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{
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string fromClause = (string) autoSelectFromClauseCache[beanName];
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if(fromClause == null)
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{
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fromClause = this.CreateAutoSelectFromClause(beanMetaData);
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autoSelectFromClauseCache[beanName] = fromClause;
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}
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buf.Append(fromClause);
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}
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return buf.ToString();
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}
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protected virtual string CreateAutoSelectFromClause(IBeanMetaData beanMetaData)
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{
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StringBuilder buf = new StringBuilder(100);
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buf.Append("FROM ");
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string myTableName = beanMetaData.TableName;
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buf.Append(myTableName);
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for(int i = 0; i < beanMetaData.RelationPropertyTypeSize; ++i)
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{
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IRelationPropertyType rpt = beanMetaData.GetRelationPropertyType(i);
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IBeanMetaData bmd = rpt.BeanMetaData;
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buf.Append(" LEFT OUTER JOIN ");
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buf.Append(bmd.TableName);
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buf.Append(" ");
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string yourAliasName = rpt.PropertyName;
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buf.Append(yourAliasName);
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buf.Append(" ON ");
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for(int j = 0; j < rpt.KeySize; ++j)
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{
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buf.Append(myTableName);
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buf.Append(".");
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buf.Append(rpt.GetMyKey(j));
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buf.Append(" = ");
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buf.Append(yourAliasName);
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buf.Append(".");
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buf.Append(rpt.GetYourKey(j));
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buf.Append(" AND ");
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}
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buf.Length = buf.Length - 5;
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}
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return buf.ToString();
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}
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public virtual string IdentitySelectString
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{
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get { return null; }
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}
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public virtual string GetSequenceNextValString(string sequenceName)
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{
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return null;
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}
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}
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}
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