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string CreatUpdate()
2 {
3
4 StringPlus strclass =
new StringPlus();
5 StringPlus strclass1 =
new StringPlus();
6 StringPlus strclass2 =
new StringPlus();
7 //方法注释
8 strclass.AppendSpaceLine(2, "
/// <summary>");
9 strclass.AppendSpaceLine(2, "
/// " + Languagelist["
summaryUpdate"].ToString());
10 strclass.AppendSpaceLine(2, "
/// </summary>");
11 //构建方法指定方法形参为要更改的数据表对应的实体对象
12 strclass.AppendSpaceLine(2, "
public bool Update(" + ModelSpace + "
model)");
13 strclass.AppendSpaceLine(2, "
{");
14 //构建StringBuilder实例装在Sql语句
15 strclass.AppendSpaceLine(3, "
StringBuilder strSql=new StringBuilder();");
16 strclass.AppendSpaceLine(3, "
strSql.Append(\"update " + _tablename + "
set \");");
17 //表中所有列，获取列名、数据类型、长度、是否只增及是否为主键
18 foreach (ColumnInfo field
in Fieldlist)
19 {
20 string columnName = field.ColumnName;
21 string columnType = field.TypeName;
22 string Length = field.Length;
23 bool IsIdentity = field.IsIdentity;
24 bool isPK = field.IsPrimaryKey;
25
26 strclass1.AppendSpaceLine(3, "
db.AddInParameter(dbCommand, \"" + columnName + "
\", DbType." + CSToProcType(columnType) + "
, model." + columnName + "
);");
27
28 if (field.IsIdentity || field.IsPrimaryKey || (Keys.Contains(field)))
29 {
30 continue;
31 }
32 // 构建赋值语句
33 strclass.AppendSpaceLine(3, "
strSql.Append(\"" + columnName + "
=" + preParameter + columnName + "
,\");");
34 }
35
36
37 //去掉最后的逗号
38 strclass.DelLastComma();
39 strclass.AppendLine("
\");");
40 //构建Where条件
41 strclass.AppendSpaceLine(3, "
strSql.Append(\" where " + GetWhereExpression(Keys) + "
\");");
42
43 //创建命令对象
44 strclass.AppendSpaceLine(3, "
Database db = DatabaseFactory.CreateDatabase();");
45 strclass.AppendSpaceLine(3, "
DbCommand dbCommand = db.GetSqlStringCommand(strSql.ToString());");
46
47
48 strclass.Append(strclass1.Value);
49 //向数据库提交sql语句并返回执行结果
50 strclass.AppendSpaceLine(3, "
int rows=db.ExecuteNonQuery(dbCommand);\r\n");
51 //判断结果并返回相应提示
52 strclass.AppendSpaceLine(3, "
if (rows > 0)");
53 strclass.AppendSpaceLine(3, "
{");
54 strclass.AppendSpaceLine(4, "
return true;");
55 strclass.AppendSpaceLine(3, "
}");
56 strclass.AppendSpaceLine(3, "
else");
57 strclass.AppendSpaceLine(3, "
{");
58 strclass.AppendSpaceLine(4, "
return false;");
59 strclass.AppendSpaceLine(3, "
}");
60
61
62 strclass.AppendSpaceLine(2, "
}");
63 return strclass.ToString();
64 }