先是查詢整張表，用到combobox選擇查詢哪張表，最後用datagridview顯示
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
private void datagridview1_cellcontentclick(object sender, datagridviewcelleventargs e)
private void form1_load(object sender, eventargs e)
private void combobox1_selectedindexchanged(object sender, eventargs e)
datatable table = sqlmanage.tableselect(sql);
this.datagridview1.datasource = table;}}
}
然後是修改**，這個比較簡單，用到textbox和button
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
private void button4_click(object sender, eventargs e)
private void button1_click(object sender, eventargs e)
','','')",
this.textbox1.text, this.textbox2.text, this.textbox3.text);
sqlmanage.tablechange(sql);
}private void button2_click(object sender, eventargs e)
','''','')",
this.textbox1.text, this.textbox2.text, this.textbox3.text);
sqlmanage.tablechange(sql);
}private void button3_click(object sender, eventargs e)
'",this.textbox1.text);
sqlmanage.tablechange(sql);
}private void form2_load(object sender, eventargs e)
}}
按條件查詢**，這個是核心，用到radiobutt，combobox,，button， datagridview
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
private void datagridview1_cellcontentclick(object sender, datagridviewcelleventargs e)
private void form3_load(object sender, eventargs e)
if (table.rows.count > 0)
//初始化教師姓名
string sql_name = "select t_name from teacher";
table.clear();
table = sqlmanage.tableselect(sql_name);
string t_name;
foreach (datarow row in table.rows)
if (table.rows.count > 0)
//初始化學生
string sql_id = "select id from student";
table.clear();
table = sqlmanage.tableselect(sql_id);
string s_id;
foreach (datarow row in table.rows)
if (table.rows.count > 0)
//初始化學生
string sql_sname = "select name from student";
table.clear();
table = sqlmanage.tableselect(sql_sname);
string t_sname;
foreach (datarow row in table.rows)
if (table.rows.count > 0)
}private void button2_click(object sender, eventargs e)
private void button1_click(object sender, eventargs e)
'",this.combobox1.text);
}else if (this.radiobutton2.checked)
'",this.combobox2.text);
}else if (this.radiobutton3.checked)
'",this.combobox3.text);
}else if (this.radiobutton4.checked)
'",this.combobox4.text);
}datatable table = sqlmanage.tableselect(sql);
if (table.rows.count > 0)
else
}private void radiobutton1_checkedchanged(object sender, eventargs e)
else
}private void radiobutton2_checkedchanged(object sender, eventargs e)
else
}private void radiobutton3_checkedchanged(object sender, eventargs e)
else
}private void radiobutton4_checkedchanged(object sender, eventargs e)
else}}
}
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