90 lines
2.5 KiB
Markdown
90 lines
2.5 KiB
Markdown
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The PostgreSQL INSERT statement is used to insert a single record or multiple records
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into a table. More about PostgreSQL INSERT statement can be found here: https://www.postgresql.org/docs/11/sql-insert.html
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Following SQL table is used for insert example:
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```sql
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CREATE TABLE IF NOT EXISTS link (
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id serial PRIMARY KEY,
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url VARCHAR (255) NOT NULL,
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name VARCHAR (255) NOT NULL,
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description VARCHAR (255)
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);
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```
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### Insert row by row
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```
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insertQuery := Link.INSERT(Link.ID, Link.URL, Link.Name, Link.Description).
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VALUES(100, "http://www.postgresqltutorial.com", "PostgreSQL Tutorial", DEFAULT).
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VALUES(101, "http://www.google.com", "Google", DEFAULT).
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VALUES(102, "http://www.yahoo.com", "Yahoo", nil)
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```
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There is also shorthand notation for inserting model data:
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```
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tutorial := model.Link{
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ID: 100,
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URL: "http://www.postgresqltutorial.com",
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Name: "PostgreSQL Tutorial",
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}
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google := model.Link{
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ID: 101,
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URL: "http://www.google.com",
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Name: "Google",
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}
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yahoo := model.Link{
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ID: 102,
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URL: "http://www.yahoo.com",
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Name: "Yahoo",
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}
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insertQuery := Link.INSERT(Link.ID, Link.URL, Link.Name, Link.Description).
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MODEL(turorial).
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MODEL(google).
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MODEL(yahoo)
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// Or event shorter if model data is in the slice:
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insertQuery := Link.INSERT(Link.ID, Link.URL, Link.Name, Link.Description).
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MODELS([]model.Link{turorial, google, yahoo})
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```
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`Link.ID, Link.URL, Link.Name, Link.Description` - is the same as Link.AllColumns
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so above statement can be simplified to:
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```
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insertQuery := Link.INSERT(Link.AllColumns).
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MODELS([]model.Link{turorial, google, yahoo})
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```
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`Link.ID` is a primary key autoincrement column so it can be omitted in INSERT statement.
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`Link.MutableColumns` - is shorthand notation for list of all columns minus primary key columns.
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```
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insertQuery := Link.INSERT(Link.MutableColumns).
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MODELS([]model.Link{turorial, google, yahoo})
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```
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Inserts using `VALUES`, `MODEL` and `MODELS` can appear as the part of the same insert statement.
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```
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insertQuery := Link.INSERT(Link.ID, Link.URL, Link.Name, Link.Description, Link.Description).
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VALUES(101, "http://www.google.com", "Google", DEFAULT, DEFAULT).
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MODEL(turorial).
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MODELS([]model.Link{yahoo})
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```
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### Insert using query
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A query (SELECT statement) that supplies the rows to be inserted.
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```
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// duplicate first 10 entries
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query := Link.
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INSERT(Link.URL, Link.Name).
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QUERY(
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SELECT(Link.URL, Link.Name).
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FROM(Link).
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WHERE(Link.ID.GT(Int(0)).AND(Link.ID.LT_EQ(10))),
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)
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```
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