tabsquery_parambyname.htm

来自「Absolute Database 5.12 src. Absolute Da」· HTM 代码 · 共 64 行

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<span style="font-family:Helvetica,Arial; font-size:12pt; color:#000000"><b>TABSQuery.ParamByName</b><span style="font-family:Helvetica,Arial; font-size:12pt; color:#0000FF"><b>
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<span style="font-family:Helvetica,Arial; font-size:10pt; color:#000000">Accesses parameter information based on a specified parameter name.
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<b>function</b> ParamByName(<b>const</b> Value: String): TParam;
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<b>Description</b>
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Call ParamByName to set or use parameter information for a specific parameter based on its name.
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Value is the name of the parameter for which to retrieve information.
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ParamByName is primarily used to set an parameter's value at runtime. For example, the following statement retrieves the current value of a parameter called "Contact" into an edit box:
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Edit1.Text := Query1.ParamByName('Contact').AsString;
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Parameters used in SELECT statements cannot be NULL, but they can be NULL for UPDATE and INSERT statements.
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