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-rw-r--r--dependencies/pkg/mod/github.com/mattn/go-sqlite3@v1.14.16/_example/limit/limit.go113
1 files changed, 113 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/mattn/go-sqlite3@v1.14.16/_example/limit/limit.go b/dependencies/pkg/mod/github.com/mattn/go-sqlite3@v1.14.16/_example/limit/limit.go
new file mode 100644
index 0000000..bcba819
--- /dev/null
+++ b/dependencies/pkg/mod/github.com/mattn/go-sqlite3@v1.14.16/_example/limit/limit.go
@@ -0,0 +1,113 @@
+package main
+
+import (
+ "database/sql"
+ "fmt"
+ "log"
+ "os"
+ "strings"
+
+ "github.com/mattn/go-sqlite3"
+)
+
+func createBulkInsertQuery(n int, start int) (query string, args []interface{}) {
+ values := make([]string, n)
+ args = make([]interface{}, n*2)
+ pos := 0
+ for i := 0; i < n; i++ {
+ values[i] = "(?, ?)"
+ args[pos] = start + i
+ args[pos+1] = fmt.Sprintf("こんにちは世界%03d", i)
+ pos += 2
+ }
+ query = fmt.Sprintf(
+ "insert into foo(id, name) values %s",
+ strings.Join(values, ", "),
+ )
+ return
+}
+
+func bulkInsert(db *sql.DB, query string, args []interface{}) (err error) {
+ stmt, err := db.Prepare(query)
+ if err != nil {
+ return
+ }
+
+ _, err = stmt.Exec(args...)
+ if err != nil {
+ return
+ }
+
+ return
+}
+
+func main() {
+ var sqlite3conn *sqlite3.SQLiteConn
+ sql.Register("sqlite3_with_limit", &sqlite3.SQLiteDriver{
+ ConnectHook: func(conn *sqlite3.SQLiteConn) error {
+ sqlite3conn = conn
+ return nil
+ },
+ })
+
+ os.Remove("./foo.db")
+ db, err := sql.Open("sqlite3_with_limit", "./foo.db")
+ if err != nil {
+ log.Fatal(err)
+ }
+ defer db.Close()
+
+ sqlStmt := `
+ create table foo (id integer not null primary key, name text);
+ delete from foo;
+ `
+ _, err = db.Exec(sqlStmt)
+ if err != nil {
+ log.Printf("%q: %s\n", err, sqlStmt)
+ return
+ }
+
+ if sqlite3conn == nil {
+ log.Fatal("not set sqlite3 connection")
+ }
+
+ limitVariableNumber := sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
+ log.Printf("default SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
+
+ num := 400
+ query, args := createBulkInsertQuery(num, 0)
+ err = bulkInsert(db, query, args)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ smallLimitVariableNumber := 100
+ sqlite3conn.SetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER, smallLimitVariableNumber)
+
+ limitVariableNumber = sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
+ log.Printf("updated SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
+
+ query, args = createBulkInsertQuery(num, num)
+ err = bulkInsert(db, query, args)
+ if err != nil {
+ if err != nil {
+ log.Printf("expect failed since SQLITE_LIMIT_VARIABLE_NUMBER is too small: %v", err)
+ }
+ }
+
+ bigLimitVariableNumber := 999999
+ sqlite3conn.SetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER, bigLimitVariableNumber)
+ limitVariableNumber = sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
+ log.Printf("set SQLITE_LIMIT_VARIABLE_NUMBER: %d", bigLimitVariableNumber)
+ log.Printf("updated SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
+
+ query, args = createBulkInsertQuery(500, num+num)
+ err = bulkInsert(db, query, args)
+ if err != nil {
+ if err != nil {
+ log.Fatal(err)
+ }
+ }
+
+ log.Println("no error if SQLITE_LIMIT_VARIABLE_NUMBER > 999")
+}