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42 lines
1.8 KiB
Markdown
42 lines
1.8 KiB
Markdown
# Introduction
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_This page explains insert statements with a static structure. If you want to learn about constructing insert statements at runtime, you should still read this page first and then move on to [dynamic insert statements](Dynamic-Insert.md)._
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# A Basic example
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Haven't found the time to document this in any detail, yet, but this is an example:
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```C++
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db(insert_into(tab).set(tab.gamma = true));
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db(insert_into(tabDateTime)
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.set(tabDateTime.colTimePoint = std::chrono::system_clock::now()));
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```
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This is how you could insert multiple rows at a time:
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```C++
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auto multi_insert = insert_into(t).columns(t.gamma, t.beta, t.delta);
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multi_insert.values.add(t.gamma = true, t.beta = "cheesecake", t.delta = 1);
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multi_insert.values.add(t.gamma = sqlpp::default_value, t.beta = sqlpp::default_value,
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t.delta = sqlpp::default_value);
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multi_insert.values.add(t.gamma = sqlpp::value_or_null(true),
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t.beta = sqlpp::value_or_null("pie"),
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t.delta = sqlpp::value_or_null<sqlpp::integer>(sqlpp::null));
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db(multi_insert);
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```
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Note that `add` currently requires precise value types, equal to the respective column's value
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type. For instance, time point columns are represented as
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`std::chrono::time_point<std::chrono::system_clock, std::chrono::microseconds>`.
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Thus, when using such a column in a `multi_insert`, you might have to cast to the right
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time point.
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```
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auto multi_time_insert = insert_into(tabDateTime).columns(tabDateTime.colTimePoint);
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multi_time_insert.values.add(tabDateTime.colTimePoint = std::chrono::time_point_cast<std::chrono::microseconds>(
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std::chrono::system_clock::now()));
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```
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Similar for other data types.
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See also [dynamic insert statements](Dynamic-Insert.md). |